Biological pesticides - BT use "four look" to ensure control

Biopesticide- BT is a broad-spectrum, highly effective and safe insecticide. Because it can effectively control a variety of pests, and does not harm human, livestock, poultry and natural enemies of pests, it attracts many people's attention. However, if it is used improperly, it will also reduce the efficacy. Therefore, when using the pesticide, first understand its characteristics and how to use it:
First, master the application period and spraying concentration BT pesticides are mainly used to control economic crops of cotton bollworm, red bollworm, bridge worm, tobacco budworm, etc.; food crops of stem borer, stem borer, rice borer, rice Vertical leafhoppers, etc.; vegetable cabbage caterpillars, diamondback moth, rapeseed meal, etc.; fruit tree pine caterpillars, peach small heartworm, scales, big bag moth, leaf roller moth. The suitable period for controlling cotton bollworm is: at the peak of spawning, that is, when the number of eggs reaches 100, the application begins, and the application is repeated once every 3 to 4 days, and the application is 2 to 3 times per generation. Appropriate increase in the number of applications. Other pests such as cabbage caterpillar, tobacco budworm, bean hawk moth, corn borer, pine caterpillar and fruit tree pests can be applied at the peak of spawning or at the early age of larvae.
Spraying concentration: 10 billion spores/g of bacteria powder, spraying 2,000 times of water per 667 m2, can control the most sensitive rice mites, rice aphids, cotton small bridgeworms, thorn moths and cabbage caterpillars of BT pesticides; Controlling cabbage caterpillars with 1000 times solution of billion spores/g or 300 times solution of BT emulsion; controlling rice leaf roller, rice locust and sweet potato hawk moth with BT emulsion 400-600 times liquid; using BT emulsion 1000 times liquid to prevent and cure Helicoverpa armigera, Pieris rapae, Plutella xylostella, etc.; for controlling corn borer, 10 billion spores/g of bacteria powder can be used, each 667m250g, diluted 2000 times of water, or 100-200 times of BT emulsion and 3.5~ per 667m2 Mix 5kg of fine sand thoroughly to make granules and put them into the corn bell mouth.
Second, when spraying pesticides , "four look" to ensure the use of BT pesticides when using anti-effects, you must do "four look":
One is to look at the temperature. When used at 25 ° C ~ 30 ° C, the control effect is 10 to 2 times higher than 10 ° C ~ 15 ° C. Therefore, it is best not to use when the temperature is lower than 20 °C.
The second is to look at humidity. The higher the ambient humidity, the better the control. Powder BT can fully exert its effects under high humidity conditions.
The third is to look at the sun. In order to avoid the destruction of the spores by ultraviolet rays in the sun, it is best to use it after the cloudy or afternoon.
The fourth is to watch the rain. Medium to heavy rain will wash away the liquid sprayed on the stems and leaves of the plants, thus reducing the efficacy. After the spraying, the hair drizzle in the milk, which has an effect of increasing the control effect. If there is heavy rain after spraying, it must be refilled.
BT pesticides are slower than chemical pesticides. Generally, the pests eat BT30min, that is, stop the hazard crops, die 24h, reach the peak of death at 48h, and the mortality rate can reach more than 75% at 72h. Although the pests did not die on the day after application, they stopped eating, so no additional pesticides were needed.
Tips for China Pesticide Network : BT pesticides cannot be mixed with organophosphorus pesticides and fungicides.

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