What kind of pesticide is used in powdery mildew

Powdery mildew is a common disease in many vegetables and fruits, but novice growers may not know how to solve it. Today, let's take a look at what pesticides are used in powdery mildew.

What pesticides are used in powdery mildew

When the plant appears powdery mildew, to find out the specific cause, and then you can choose some spray or wettable powder to use. For different plants, the specific pesticides are also different.

II. Introduction of pharmaceuticals

(1) spray or coat the branches with Baume 3 to 5 degrees of stone sulfur mixture diluent during the overwintering period. Note that flowers such as melons, leaves, chrysanthemums and other flowers that are vulnerable to medicine cannot be used. Spray sulfur powder on the ground, generally use 25 grams to 30 grams every 70 square meters to eliminate the source of overwintering bacteria.

(2) the protective agent can be sprayed before the disease in the growing period, and the inhaler should be sprayed after the disease. According to the symptoms of the disease, the growth of flowers and trees, climate conditions and the characteristics of pesticides, the pesticide should be applied once at intervals of 5 to 20 days, 2 to 5 times successively. For flowers and trees in a season, an internal absorbent can only be applied once or twice. The types of pesticides should be changed frequently to prevent bacteria from developing drug resistance.

(3) when the disease is prevalent, 20% tetrafluoride can be sprayed. Pyrazole ester, 1000-fold solution of 15% trimethoprim, 1000-fold solution of 2% antimycin aqueous agent, and 1000-1500 fold solution of polyantimycin. As a result of repeated use of traditional medicine to produce antibodies to bacteria, the effect is sharply reduced, so alternate use is advocated. In addition, 1000 times liquor (35% alcohol content) can be used, spray every 3 to 6 days, spray 3 to 6 times continuously, and rinse the leaves until there is no white powder.

(4) Flowers and trees planted in protected areas such as greenhouses and greenhouses can be sprayed with fumigant and dust agents in addition to the above-mentioned chemicals. Empty shed disinfection should be carried out before or after planting. 250 grams of sulfur powder and 500 grams of sawdust are used for every 100 square meters, evenly mixed, divided into 10 piles, lit with red-hot briquettes or charcoal, can not be burned with open fire, and close the shed for one day and night. In the process of fumigation, we should strictly guard against fire. Smoking during the growing period of flowers and trees is prone to drug damage, so it should be used with caution. 45% chlorothalonil smoke remover is used before the disease occurs in the plant growth period.

(5) spraying 200-fold solution of high-fat membrane (emulsion) has a good effect on the prevention of powdery mildew and the initial stage of treatment.