It mainly harms leaves, but also stems, fruits and fruit stalks. When the leaves are infected, small round spots similar to water stains are produced at the initial stage, and then they expand into dark brown circles or nearly circles. The stem is infected, initially waterlogged, and after expansion, it is dark green or dark brown, round or oval. Increase the application of phosphorus, potassium fertilizer and organic fertilizer to avoid excessive application of nitrogen fertilizer. Conditional people can use formula fertilization technology, apply compost made of enzyme bacteria or fully decomposed organic fertilizer, irrigate reasonably, avoid watering too much, and choose watering time in the shed in the morning so as to have enough time to let out the wind and discharge moisture.
If you encounter such a serious disease, you must not blindly take medicine, but carefully observe and find out the cause of tomato leaf spot disease, and then take targeted measures. A large number of pathogenic bacteria have been accumulated in continuous cropping all the year round, and too high humidity and density in the field can all cause tomato leaf blight. Therefore, reasonable close planting and rotation with non-solanaceae plants can effectively control tomato leaf blight. In severe cases, the diseased spots are connected into pieces, and the diseased tissues fall off, forming perforations. Petiole and stem lesions are oval and slightly convex. The lesion is grayish white in the middle, dark brown around, and the lesion is round, especially like fish eye, so it is also called tomato fish eye spot disease.
The use of Qingkulike, Wofengsu and garlic oil spray from Weifang Aofeng can play the role of combining medicine with nutrition, sterilize and prevent diseases, supplement nutrients such as polysaccharides, peptides and chlorogenic acid, and be directly absorbed and utilized by crops. Restore crop growth and improve disease resistance.