How to prevent tomato gray leaf spot?

Tomato gray leaf spot is a serious and frequent disease in recent years. The main feature of the disease is that it targets leaves, and can reduce yield when the damage is serious.

A typical symptom of gray leaf spot is the appearance of many dense small spots on the leaves, which are gray-white in the middle and brown on the outside, with a little ring pattern. The lesions are slightly smaller and larger, and the lesions are easy to rupture in the middle and late stages.

During field management, some vegetable farmers may have discovered the occurrence of gray leaf spot in the shed early, and treated it with medicine in time. However, because no new leaves have grown, and no change can be seen after spraying the medicine, it is considered that there is no effect. Please pay attention. Tomato gray leaf spot disease must be prevented in advance.

Generally speaking, such as bromoxynil, acetaminophen, dysenzine, isobactil, thiophanate, polydoxazole, as well as fluconazole, fluopyram, etc., can be selected according to the situation One or both are sprayed for control over about five to seven days. If the problem is more serious, you can spray several times as appropriate. In addition, regular ventilation is required to reduce the humidity in the shed. When watering, water is often poured with small amounts of water, and the fertilizer is small and several times to reduce the humidity in the shed as much as possible. And the front face is appropriately hit a little harder, because that position is more prone to the harm of gray leaf spot.

After spraying the medicament to control gray leaf disease, it is necessary to spray fertilizer on the foliar surface. Maintain leaves and supply fruit nutrition. Whether it is magnesium supplement, potassium supplement, boron calcium supplement, or fertilizer containing the amino acid chitin, it needs to be sprayed alternately. The fruit can be swelled better to avoid poor leaf growth due to gray leaf spot, which affects the enlargement of tomato fruit.