Why do paniculate hydrangea leaves turn yellow? Reasons why hydrangea leaves turn pale Why do hydrangeas have pale green leaves

Iron chlorosis is a disease that occurs in plants due to a disruption in the formation of chlorophyll in the leaves. If you notice that only the veins on the leaves of your flower remain green, and the leaves themselves have turned yellow, it’s time to treat it.

To put it simply, iron chlorosis indicates a lack of iron in the plant’s body. The disease appears when there is a lack of iron in the soil, as well as when the plant, for some reason, has lost the ability to absorb this substance. In any case, it is necessary to find out the causes of the phenomenon and begin treatment; most often it turns out that the diseased plant simply needs to be fed with iron.

In the photo, the hydrangea is susceptible to chlorosis.

For example, in spring, chlorosis in hydrangea and other plants can develop due to large temperature differences between day and night. If the roots of plants are in cold soil and the leaves are heated by the sun's rays, the metabolism in the plant is disrupted, and the process of chlorophyll formation in its leaves slows down. As a result, the plant becomes ill with chlorosis, and it needs urgent treatment so that it does not die.

In addition to yellowing of the leaves, chlorosis in hydrangea and other plants also manifests itself in other signs - the leaves decrease in size, curl at the edges and fall off. The shape of the buds and flowers also changes, they also fall off. The apical shoots dry out, and the roots stop developing and die. As a result, the plant dies completely.

In addition to hydrangea, other plants that are susceptible to chlorosis are azalea, gardenia, clerodendrum and lemon. But violets are not afraid of this disease at all.

And for this you need to choose the right substrate for the flower. The soil should be light, air and moisture permeable. Often, too dense soil retains moisture, which causes alkalization of the soil and the occurrence of chlorosis.

We should not forget that hydrangeas that grow on soil rich in lime or on soil excessively fertilized with humus develop chlorosis.

Hydrangea and other plants susceptible to chlorosis love acidified soil, so you need to constantly monitor the acidity of the soil. The easiest way in this case is to occasionally water the flowers with slightly acidified water - it is enough to acidify the water for watering once a week.

Tap water has a pH of 7; this figure must be reduced to pH 5-5.5 by adding citric acid to the water. For 1 liter of water you only need a few grains of acid - on the tip of a knife. It is best to generally water the plants with filtered or rainwater.

All these are preventive measures; if they are not carried out in a timely manner, the plant becomes ill with chlorosis, and now it needs to be treated. Treatment of hydrangea consists of several stages, including replacing the soil, watering with acidified water, adding iron to the soil and water for irrigation.

To treat hydrangea from chlorosis, iron will be needed in chelated form, so it will be easier to absorb. For spraying and applying under the roots you need to buy the following preparations:

• Iron chelate (Mikom-reacom);
• Ferovit (Nest M);
• Antichlorosis (Master Color);
• Brexil-Fe (Valagro);
• Ferrylene (Valagro);
• Micro-Fe (Orton).

The most effective treatment method is spraying the leaves - in this case, the plant absorbs beneficial substances within 24 hours. During watering, absorption occurs within three days.

Therefore, manufacturers label iron chelate as “Foliar fertilizer,” although they can also be used for irrigation.

To treat chlorosis in hydrangea and some other plants, iron chelate can be prepared at home. The recipe is very simple - take 1 liter of boiled cold water, add 0.5 tsp. citric acid, 2.5 grams of iron sulfate - a little less than 0.5 teaspoon and mix all the ingredients.

You will get a light orange liquid containing ferrous iron salt, or iron chelate with a concentration of 0.5 grams per 1 liter of water. The solution, prepared with your own hands, is used for both watering and spraying. The product should be stored in the refrigerator for no more than 15 days.

Another remedy is to dilute 10 grams of iron sulfate and 20 grams of ascorbic acid in 1 liter of water. The solution is used to treat chlorosis in hydrangea using the same method.

The easiest way to treat and prevent chlorosis in plants, which gardeners use, is to bury rusty metal objects in the garden - nails, screws, tin lids for seaming, etc.

Rust is scraped off large objects and mixed with the soil under plants susceptible to chlorosis. The method is simple, cheap and very effective.

And one more way - chlorosis in hydrangea is treated with a solution of potassium nitrate; to prepare it you will need 40 grams of potassium nitrate per 10 liters of water. The plant needs to be watered with the solution for 2-3 days, and after three days, watered with a solution of iron sulfate.

Hydrangea leaves can also turn yellow for other reasons - from a lack or excess of moisture, direct sunlight or hypothermia, from sudden temperature changes, or a lack of other nutrients, not just iron.

is an amazing flowering plant that can decorate a room, terrace, balcony, flower garden or garden.

Lush bushes with bright green foliage are strewn with caps of flowers in a variety of delicate shades: white, pink, red, lilac, blue. I would always like to see such a plant healthy and blooming, but some problems may arise during the growing process.

Hydrangea is quite resistant to diseases and pests, but still requires constant care and attention. The vagaries of nature and improper care can provoke the appearance of various diseases. In this case, it is important to identify the problem in time and know how to solve it correctly and quickly.

In the article you will see everything about hydrangeas and plant treatment, as well as photos of problems.

External stimuli

In addition to pest infestation and obvious diseases, there are external factors that negatively affect the beauty and health of hydrangea. For example, Yellowing of leaves can be caused by the following irritants:

• Bright scorching sun. The plant prefers to be in partial shade, so too much light can be harmful.
• Overmoistening of the soil. Although hydrangea loves moisture, excessive accumulation of water can cause yellowing of the foliage.
• Lack of fertilizers. For growth and lush flowering, hydrangea needs regular feeding.
• Reduced soil acidity. The flower needs acidic soil (pH 3-6). Even the color of flowers depends on the level of acidity: the more acidic the soil, the more purple and blue colors appear; closer to neutral, white and pink shades predominate. To increase acidity, periodically during watering you should add 2-4 drops of lemon juice to 1 liter of water.

Sometimes hydrangea foliage begins to dry out and fall off. The reason also lies in external stimuli:

• Insufficient watering, especially in hot weather.
• Low environmental humidity. This often happens in enclosed spaces and greenhouses. Regular ventilation and humidification of the air is important.
• Lack of nutrients. Hydrangea feeding is carried out once every 7-10 days. This is especially important during bud formation and flowering.

Sometimes a gardener may encounter blackening of hydrangea leaves. It can be dry or wet and is also caused by external factors.

Dry blackening manifests itself in the formation of brown spots on the edges of leaves, which subsequently lead to wilting of the foliage. The reason may be:

• Hard water. Before watering, it is recommended to let the water sit for at least 24 hours;
• Sunburn. It is important to protect the plant from direct sunlight.

Wet blackening determined by limp, darkened leaves. It may appear due to:

• Sudden temperature changes, drafts;
• Excessive watering;
• Heavy soil that retains moisture and impedes breathing.

Hydrangea chlorosis

Chlorosis occurs due to a lack of iron in the soil or as a result of metabolic disorders in the plant itself, due to which it cannot absorb iron.

The main sign of chlorosis is lightening and yellowing of foliage.. At the same time, the veins on the leaves remain dark.

In addition, there may be a decrease in the size of the leaves, deformation of the buds, curling of the leaf plates, and drying of the shoots.

When a disease is detected, it is important to feed the plant with preparations containing iron in chelated form, for example, Antichlorosis and Ferovit.

You can also prepare the medicinal composition yourself. To do this, dissolve 2 grams of iron sulfate and 4 grams of citric acid in a liter of water. This solution should be sprayed on hydrangea leaves, and in case of advanced forms of the disease, watered at the root.

Another way to treat hydrangea chlorosis is to use a solution of potassium nitrate and ferrous sulfate. To do this, 40 grams of potassium nitrate are diluted in a bucket of water. Hydrangea is watered with this solution 2-3 times. After 3 days, watering should be done with iron sulfate in the same concentration.

Fungal diseases of hydrangea

White rot begins with damage to the root system, since the causative fungus is in the soil. As a result, the plant cannot receive the necessary nutrients, turns brown and dies over time.

A sign of disease on young hydrangeas is the darkening of the shoots and the appearance of a white coating on them, similar to cotton wool. If the flower is not treated, black inclusions appear on the “cotton wool” - sclerotia.

To combat white rot, fungicides such as Fitosporin, Fundazol, and copper oxychloride are effective.

Gray rot manifests itself in the softness and wateriness of hydrangea tissues. In a humid environment, a gray “fluff” appears on the plant. In dry weather, the affected parts dry out and die, leaving behind holes in the leaves and stems.

The first point in the fight against gray mold is to remove the affected and dead parts. In the treatment of indoor hydrangea species, Pistotsvet, Fundazol, Skor have proven themselves well. In case of garden hydrangea disease, it is recommended to treat Rovral Flo 255 SC three times with an interval of 3 weeks.

Septoria can be identified by dark brown spots on the leaves, 2-6 mm in diameter. The leaves gradually die and fall off.

Without treatment, the hydrangea may lose all its foliage and die. In advanced forms of the disease, spots also appear on the shoots.

To get rid of septoria, all affected parts are removed, and the plant itself is treated with preparations containing copper, for example, copper oxychloride, copper sulfate.

Powdery mildew determined by yellow-green spots on the leaves, which over time become brown and acquire a clear shape.

A purple or gray coating can be seen on the back of the leaves. Without treatment, the leaves fall off, and young shoots affected by the fungus become deformed and do not survive the winter.

Fungicides are used to treat powdery mildew: Fitosporin, Alirin. At advanced stages - Skor, Topaz, Thiovit Jet, Pure Flower.

This article is often read with:

Rust

A disease that is easily identified by a rusty coating on shoots, leaves and flowers.

The cause of the problem may be the high density of hydrangea plantings or an excess of nitrogen in the soil.

Fungicides Topaz, Falcon, and Ordan are also effective. Dosage - according to instructions.

Ring spot

The most common viral disease of hydrangea is ring spot. At the beginning, it appears in the form of vague spots in the shape of rings, about 2 cm in diameter.

Because of them, the leaves of the plant become deformed, wrinkled and die over time. The disease affects the ability to set buds: either the hydrangea loses it altogether, or the flowers turn out weak and small.

Unfortunately, there is no cure for ring spot yet.

When planting, it is important to choose healthy seedlings, since this disease is transmitted through seedlings. And when propagating by cuttings, it is important to make sure that the mother plant is completely healthy.

Hydrangea pests

Leaf aphid. The main harm that the hydrangea aphid causes is that it sucks the cell sap from the plant and leaves behind a sugary secretion, which, in turn, serves as a food source for the dangerous sooty fungus. Aphids reproduce very quickly.

As a result, the flower grows very slowly, and if the damage is severe, the leaves become deformed and turn yellow, and the upper part of the hydrangea may die.

Aphids are very delicate, they are loosely attached to the plant, so if there are not very many pests, you can get rid of them by watering the hydrangea with a powerful stream of water, while being careful not to damage the flower. Treatment with a soap solution is also effective.

In advanced cases, when aphids have formed entire colonies, it is necessary to use insecticides, for example, Fitoverma, Aktary, Iskra, Zubra or Akarina. Ladybugs eat aphids.

Spider mite. It settles on the back of leaves. It can be identified by small yellow spots that merge over time into a marble pattern.

At high temperatures and low humidity, it entangles the entire plant in 5-7 days.

In this case, small cobwebs and the pests themselves will be visible. As a result, the leaves dry out and fall off.

At the initial stage, you can get rid of spider mites by treating the hydrangea with a soap solution. If there are a lot of pests, it is necessary to use insecticides such as Tiofos, Akarin, Molniya, Fitoverm.

Slug. Slugs often appear where hydrangea plantings are too dense and dense. The harm they cause is by eating the foliage of the plant.

You can get rid of this pest using a granular preparation - Molluscicide. It spreads across the surface of the earth where slugs have been spotted.

Prevention of diseases and pests

Prevention is the best treatment. If the hydrangea is healthy, it is unlikely to get sick, and if this does happen, it will withstand the disease. If the plant is weakened, then viruses, fungi or pests can seriously damage it.

What will prevent diseases and pests and help grow a strong, healthy and beautiful flower:

• Correct location. In the scorching sun, leaves and flowers begin to quickly fade. Therefore, it is optimal for hydrangea to grow in partial shade;
• Sufficient watering. The plant loves moisture, so the soil should not be allowed to dry out. On hot summer days, it is necessary to water the bush every other day;
• Choosing the right soil - hydrangea will not survive in heavy alkaline soils. It needs acidic, light soil that allows air and moisture to pass through well;
• Proper fertilizing: at the end of spring, the emphasis should be on nitrogenous fertilizers, in the summer - on phosphorus-potassium fertilizers, and in the fall - mainly phosphorus;
• Preventive treatment of hydrangea wood. In the spring, before the start of the growing season, it is recommended to treat the hydrangea bush with copper sulfate at the rate of 100 grams per bucket of water. Another option is to use more modern drugs for preventive treatment - Topaz, Iskra, Fitosporin.

With proper care and constant care, hydrangea will grow lush and beautiful. It will become a bright decoration of your home or garden!

Now you know everything about diseases of leaves and flowers of indoor and garden hydrangea and their treatment, and you have also seen photos.

Flowers on the windowsill always please the eye and lift our spirits, especially if they bloom very beautifully. Hydrangea, as a houseplant, has long settled in our homes. But there are situations when a flower ceases to please us and yellow leaves appear on it. This article will help you figure out why the leaf turned yellow.

• 1 Causes of yellowing
• 2 Video “Treatment of indoor plants”
• 3 How to cure diseased leaves
• 4 Disease prevention
• 5 Video “Why do the leaves on plants turn yellow?”

Causes of yellowing

If you see that the hydrangea has begun to turn yellow, then the first thing that comes to mind is that somewhere an error in care has crept in or the plant is missing something. Therefore, first of all, you need to evaluate the correctness of care, and only then look for other reasons why a yellow leaf appeared on the plant.

Hydrangea leaves turn yellow due to the following mistakes made when caring for it:

• you flooded the flower. Home hydrangea is a very moisture-loving plant. But even it can be flooded if you water it too often. The first to react to waterlogging will be the leaves, which will begin to turn yellow and fall off;
• lack of warmth. This indoor flower does not like drafts and low temperatures. When a plant finds itself in such a situation, the first signal about unsuitable conditions will be the appearance of a yellow leaf;
• lack of nutrients. Even indoor hydrangea, which grows in a pot, must be ensured that it receives the optimal set of micro- and macroelements;
• lack of sunlight. For normal growth and development of a flower, a certain light regime must be observed. It is important both for the health of hydrangeas and for beautiful flowering. But remember that the light should be diffused, not direct. Otherwise, those with sunburn will be added to the yellow leaves. It manifests itself in the fact that the leaves turn brown and dry out;
• feeding during flowering and formation of stems. If this is not done, after a while the first yellow leaf will appear on the stem.

It is worth looking at the lack of nutrients in more detail. During the flowering period, the plant requires the maximum amount of nutrients. And even a slight lack of them can lead to defective formation of inflorescences, and also cause the leaves to turn yellow. This usually indicates that the soil is deficient in iron and nitrogen.

If caring for the flower turned out to be correct, but the leaf is still yellow, you need to look for another reason. Sometimes hydrangea leaves turn yellow and dry out due to disease. Despite the sufficient resistance of hydrangea to various types of infections, in certain situations it can be attacked by viruses and fungi. Why such situations occur can be answered quite easily. The whole reason here lies, again, in improper care of the flower.

Indoor hydrangeas are not characterized by many diseases, and only some of them can cause yellow leaves to appear. For example, the most common reason why leaves turn yellow is a viral disease such as ring spot. In this case, the sheet not only turns yellow, but also becomes deformed. It is by the deformation of the leaf blade that one can determine that the cause is a virus.

In addition to ring spot, house hydrangea can be affected by axochytic spot. Here the castings also turn yellow. But they also dry out quite quickly, die and fall off. Indoor hydrangea is also characterized by an ailment such as chlorosis. The reason for its occurrence is a violation of the plant’s watering technique. A flower can contract chlorosis after being watered with harsh tap water, which contained a high percentage of lime.

As a result of the accumulation of lime in the soil, it leads to alkalization of the soil. The infected leaf will turn yellow and dry out. They dry out due to the fact that the plant does not have the opportunity to fully feed. Such a situation can lead to the complete death of the flower. As you can see, there are quite a few reasons that can lead to the leaves of a hydrangea turning yellow. But often the reason lies in improper care. Therefore, you need to be very attentive to this indoor flower and caring for it.

Video “Treatment of indoor plants”

How to cure diseased leaves

When the leaves turn yellow, it is necessary to urgently take measures to treat the hydrangea, otherwise the flower may die. First of all, you need to find out the cause and then proceed from it in choosing a treatment method.

Let's look at some of them:

• in case of waterlogging, the water regime should be normalized by reducing the number of waterings;
• if there is a lack of heat, move the flower out of the way of drafts and into a more heated room;
• If the cause is identified as a lack of nutrients, start fertilizing. Typically, fertilizers are added to the pot during watering along with water. You should also use only soft water that has settled well.

It is also worth noting that if there is a lack of iron in the soil, then it is necessary to restore the acidity of the soil. To do this, you need to add a solution of vinegar essence to the soil. It is prepared by adding 1 tsp to 10 liters of water. essences. Please note that you can use oxalic or citric acid instead of vinegar. In addition, a special ferovit solution can be used to restore soil pH.

But in a situation where resuming proper care no longer gives the desired result, the flower will have diseases of a viral or fungal nature. Although proper care will help improve the condition of the plant, it will not be enough. Here the infected leaf must be removed, and the hydrangea itself must be treated with special fungicidal preparations. Very often, Bordeaux mixture (1% solution) is used to combat diseases.

Measures to combat chlorosis include replanting the flower in a new pot. Its further watering is carried out only with softened water.

Disease Prevention

Prevention has always and everywhere been the best way to combat various diseases and pathologies. This applies not only to the animal world, but also to the plant world. Therefore, if you want to prevent yellow leaves from appearing on your hydrangea, follow these recommendations:

• Maintain optimal water regime. Do not over-water or dry out the plant;
• water only with soft, settled water;
• place the flower only in a warm room without drafts;
• Avoid direct exposure of the leaves to sunlight;
• do periodic feeding (especially during the flowering period).

You can also sometimes treat the flower with antimicrobial and viral agents. By following these recommendations, you can prevent the appearance of yellow leaves in indoor hydrangea and preserve its beauty for many years.

Video “Why do the leaves on plants turn yellow?”

Every self-respecting gardener has repeatedly asked himself the question: why do plants’ leaves turn yellow? To answer this as accurately as possible, we recommend watching the following video.

During the growing season, hydrangea, like many other crops, is damaged by pests and diseases. Their development and spread are influenced by air temperature and humidity, irrigation regime, untimely application of fertilizers (feeding), and dense plantings.
Hydrangea diseases most often appear in conditions of high humidity. Thus, increased air humidity is favorable for the development of downy mildew. Yellow spots appear on the leaves, which darken over time. On the underside of the leaf blade, corresponding to the spots, you can see a coating. The development and spread of the disease is facilitated by the presence of drip moisture on the plant surface. If the first symptoms appear, it is necessary to treat the plants with fungicides.
During the growing season, various spots may be found on the leaves, for example, septoria. It is characterized by the appearance of small but numerous bordered brown spots of irregular shape, which later merge. As a result, the leaves dry out. High air humidity also contributes to the development of the disease. If there is a threat of infection, it is necessary to carry out preventive treatment of plants with fungicides.
In summer, brown spots may appear on the shoots, covered with a gray fluffy coating, which indicates the development of gray rot. Subsequently, the infection spreads to leaves and flowers. The development of the disease is facilitated by high air humidity, as well as dense plantings. To prevent the occurrence of this dangerous disease, the above information should be taken into account. If the first symptoms appear, it is recommended to treat with fungicides. If the disease is severe, the affected parts of the plants are removed and destroyed.

Video: Why do the leaves turn yellow? - Professor Pochemushkin

The development and spread of viral diseases is due to the fact that carriers of viral diseases are found among hydrangea pests. As a rule, spots of various shapes are observed on plants. Thus, ring-shaped spots on the leaves of this shrub may indicate the ring spot virus.
Another sign of the presence of a viral infection is deformation of the leaf blade (leaves wrinkle in separate areas). There are no drugs to combat viral diseases. The main methods of protection are the use of healthy planting material, removal and destruction of diseased plants, and control of insect vectors.
Improper care of plantings can also cause diseases. So, for example, excessive soil moisture most often leads to wilting. Its main symptoms are stunting, wilting, yellowing and drying of the lower leaves, darkening of the lower part of the stems, and browning of the roots. For prevention, it is necessary to water in a timely and correct manner.
Diseases can be not only infectious, but also non-infectious. Non-infectious diseases include chlorosis, when the surface of the leaf becomes lighter, but the veins remain green. As a rule, it manifests itself when there is a lack of iron in the soil. If symptoms of chlorosis are detected, it is necessary to balance the plant nutrition and fertilize it.

Signs of hydrangea damage
In summer, spider mites can be found on hydrangea leaves. These are very small arthropods belonging to the class of arachnids, the order of acariform mites. If the leaves are poorly populated, they can only be detected with a magnifying glass.
Small yellow spots appear in the places where they feed, which later merge. The leaves turn yellow and dry out. When the leaves are heavily infested, necrosis appears, and the naked eye can detect cobwebs and mites actively moving along them on the plants.
Distinctive biological characteristics of the pest are its affinity for elevated temperatures, high fertility and a large number of generations per season.
To suppress spider mites, the following must be taken into account: reducing daylight hours to 14 hours and setting the temperature at + 19°C contribute to the appearance of females that fall into a state of rest. After favorable conditions return, the females emerge from this state and lay eggs on the underside of the leaves.
When selecting drugs to combat spider mites, first of all, you need to know their characteristics according to the object of use. For these purposes, acaricides and insecto-acaricides should be used.
The second dangerous pest of hydrangea is aphids. The harmfulness of the insect lies in sucking juice from plants, contaminating the leaves with sugary secretions, which are subsequently colonized by sooty fungi. In addition, aphids are carriers of viral plant diseases. When the pest is heavily infested, the leaves turn yellow and fall off. Insects form numerous colonies. They can be easily noticed if you pay attention to the underside of the leaf blade.
To reduce the number of this pest, it is necessary to destroy weeds, which are a reserve of insects, and in the event of a mass appearance of aphids, use insecticides.
During periods of high humidity and moderate temperatures, hydrangeas can be damaged by slugs. Most often they appear in dense plantings. These polyphagous pests damage plants by gnawing on foliage. To combat them, special drugs are used - molluscicides. They are produced in the form of granules, which need to be scattered on the surface of the soil near the plantings.
For those who like to listen to music on a smartphone or other iPhone device, the website maclove.com.ua offers a wide selection of headsets and headphones that have an updated design and improved characteristics.
Natalya Egorova, Candidate of Biological Sciences, Do-It-Yourself Garden No. 6 2013

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Hydrangeas do not like direct sunlight; they should be planted in partial shade or create artificial shade during the midday hours.

Do not water them with water straight from the tap. You need to let the water not only sit for at least a day, but also let it warm up.

Sluggish, also known as wet blackening - the foliage darkens and becomes limp. This happens due to:
· excessive moisture;
· planting in heavy soil;
· sudden changes in temperature or too cold summers.

To improve the health of the bush, watering should be restored. In case of unsuitable soil, only transplanting to a more suitable place will help. In unfavorable weather conditions, mulching will help protect the root system.

Quite often, hydrangeas have leaves that look like fade, become pale green, almost yellow, the veins on them remain a rich green color. The disease is called chlorosis and is caused by iron deficiency. Either it is not in sufficient quantities in the soil, or the flower itself, due to some of its characteristics, is not able to fully absorb it.

In addition to color changes, signs of chlorosis may include a decrease in size of leaves, curling, buds may also dry out or young shoots may fall off.

To avoid this disease, you need to feed hydrangeas only with special fertilizers that prevent the soil from leaching. You can use pine waste as mulch or sprinkle it with coffee.
Many gardeners slightly acidify the water for watering.

If the plant does become ill, treatment is carried out with iron chelates (special preparations Ferovit, Antichlorosis, etc.). Solutions are used according to instructions. The best results are usually obtained by spraying the leaves.

The appearance of small (from 2 to 6 millimeters) dark brown spots on the green parts of the plant means infection with septoria. The disease spreads quickly and can destroy an adult hydrangea in a short time. To combat the scourge, there are special preparations; as a preventative measure in the spring, all bushes must be sprayed with Bordeaux mixture.

Parts affected by septoria are cut off, including healthy areas, and burned. The sections are disinfected and covered with garden varnish.

If the bushes are planted too densely or there is an excess of nitrogen in the soil, brown-rusty spots appear on the leaves. This is a rust, fungal disease. To improve health, they are treated with copper-containing preparations.