What medicine should be given to tomatoes if they get early blight? How to prevent and cure?

Tomato early blight is a disease of growers. So if the tomato got the early blight, what medicine should be given and how to prevent it? Tomato early blight has occurred in Northeast, North China, East China, Southwest and other regions of China, the most important of which is that no matter the disease spot on the fruit, leaf or main stem, there are obvious wheel lines, so it is also called wheel streak. the disease spot of the fruit is mainly near the fruit stalk, the stem spot is often at the bifurcation, and the leaf spot occurs on the mesophyll.

Symptoms of early blight

Tomato early blight is mainly harmful to leaves, but also to seedlings, stems and fruits. The seedlings are infected, resulting in dark brown spots at the base of the stem and slightly sunken rims. When the leaves were killed in the adult stage, most of them developed upward from the lower leaves of the plant, and began to show watery dark green disease spots, and enlarged into round or irregular wheel spots. There are many halo rings with light green or yellow on the edge, concentric wheel pattern in the middle, black mildew layer on the disease spot when it is wet, and leaves fall off when it is serious.

Second, the incidence regularity of early blight.

Tomato early blight is infected by Alternaria solanacearum, which overwinters on soil or seeds, spreads through wind and rain, invades from stomata, lenticels, wounds or epidermis, and causes the disease. The pathogen can be infected many times in the field, resulting in serious disease in the peak period. When the temperature is 20 degrees, the relative humidity is more than 80% or the weather is cloudy and rainy, the disease is easy to spread. The incidence of continuous cropping land, low-lying land, overwatering or poorly ventilated land is serious.

III. Prevention and treatment of early blight

1. Chemical control of early blight.

In the early stage of the disease, diseased leaves, diseased fruits and seriously diseased branches were removed in time, and germicidal pesticides were sprayed. In order to prevent drug resistance and improve prevention, alternate or compound use was advocated, spraying once a week and three times in a row. When the disease is serious, the central diseased plants and diseased leaves should be removed, and the prevention and treatment method of integrated traditional Chinese and western medicine should be adopted in time.

2. Agricultural prevention and control of early blight

(1) to cultivate strong seedlings: it is necessary to adjust the temperature and humidity of the seedling bed, divide the seedlings when the seedlings grow to two leaves, and beware of overgrowing seedlings. It can prevent disease at seedling stage.

(2) rotation: tomato should be rotated with non-Solanaceae crops for three years. Strengthen management: to implement Gaolong cultivation, reasonable fertilization, fixed value and slow seedling should be closed in time to promote the occurrence of new roots. The temperature and humidity in the greenhouse should be well controlled and the management of ventilation should be strengthened.

The above is the tomato early blight brought by the editor of Tuliu.com. I hope it will be helpful to the farmers. if you have anything you don't understand, you can comment and leave a message below. I will reply to you in time. I'll see you next time.