Fruit tree round spot disease mainly damages the leaves of fruit trees. In severe cases, it can also infect the branches and fruits of fruit trees. In the early stage of infection, small yellow-green dots appear on the leaves, with a diameter of 1-5 mm, and gradually turn from light brown to light brown. The lesions are grey, and often have a ring-like texture with black spots in the middle. This is my jujube orchard where spotted defoliation occurred in 2002. Around the end of June of that year, it was found that the leaves of jujube trees had small spots that were almost brown. As the jujube trees grew, the spots showed signs of slowly expanding. The spots around the leaves gradually became spots and the most susceptible to the disease. On young leaves, the main symptom in the early stage is brown round spots, which turn into irregular spots in the later stage. The first onset occurred in the rainy month of May. We have had a lot of rain here this year. The picture below shows the symptoms of my young tree when it is infected with spotted defoliation disease.

Defoliation disease is prone to occur in environments with a lot of rain and high temperatures. When the disease first occurs, small spots will appear on the leaves, and then the spots gradually expand and eventually connect together, causing the entire leaf to fall off. After discovering this disease, the diseased leaves need to be removed in time. Leaf spot is one of the important diseases of fruits and vegetables. It is widely distributed and occurs all over the country. It is definitely in the spring when the temperature is low and there is a lot of rain. The most severe cases occur in the autumn. The incidence rate is 20% to 60%, and it reaches 90% in serious plots, which can reduce yields. During the planting process, the leaves of the plants often become soft and gradually turn yellow. The main reason is mostly anise sunburn. The anise tree is a shade-loving tree species. In the seedling stage, the plant is not covered by other natural plants and is exposed to direct sunlight for many reasons. The first possibility is that it is not watered enough. It likes to grow in a humid environment. If the soil is too dry, the plant will turn yellow due to lack of water. The second possibility is that the temperature is too low. When the temperature is below 10℃ in winter, you need to do a good job of keeping warm. If you usually water too little, the leaves at the bottom of the plum blossom will gradually wither and fall, but the new leaves will still be normal. This means that the plant is short of water and needs to be replenished with water in time.