Lemon trees can also grow well as potted plants in Germany. However, the plants in our area require some care, otherwise there is a risk of disease. The dreaded powdery mildew, on the other hand, can also occur on he althy and strong citrus plants.
What does mildew look like on lemon trees?
Powdery mildew on citrus plants is manifested by awhite, mealy coating on the upper side of the leaves. As the infection progresses, the leaves turn brown and look dried out. Since few lemon trees grow in Germany, infection through infected plants is rare.
How can I control mildew on lemon trees?
In order to protect the plant as much as possible when infested with powdery mildew, the leaves are carefully but thoroughly wiped with milk or vinegar. This treatment is carried out several times. For larger citrus plants, you can also spray the leaves with a mixture of milk and water. Use only whole milk or whey. Other dairy products such as long-life milk contain too little lactic acid to kill the fungus. If the leaves have already turned brown, you should remove them before treatment.
Can I prevent mildew on lemon trees?
The mildew spores are spread by the wind and are thereforedifficult to stop However, there are few sources of disease in Germany. At the same time, grafted plants are usually sold that rarely show mildew infestation. Powdery mildew is a so-called “fair weather fungus” because it prefers to occur in warm, dry weather. Therefore, water your plants several times a week in summer.
Tip
Mildew on various types of citrus
Mildew fungi are specialized for certain varieties. Citrus powdery mildew also occurs on kumquat and oranges. If a citrus plant in your garden has already become infected, observe the other varieties and treat them preventively with field horsetail
