When it comes to BT bio-pesticides , I think most of my friends will not be unfamiliar. BT bio-pesticide is a commonly used insecticide. It is not only highly effective, but also harmful to the earth, but you don’t understand the correct use of BT bio-pesticide. To reduce the efficacy of the drug, the effect will not be ideal. Let's follow the small series of the pesticide network to understand the correct use of BT bio-pesticide.
First, master the application period and spray concentration
BT biological pesticides are mainly used to control economic crops such as cotton bollworm, red bollworm, bridge worm, tobacco budworm, etc.; rice stem borer, stem borer, rice borer, rice leaf roller, etc.; Pieris rapae, Plutella xylostella, Rapeseed, etc.; pine caterpillars, peaches, heartworms, large moths, leaf curlers, etc. 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.
The concentration of BT bio- pesticide sprayed: 10 billion spores/g of bacteria powder, sprayed 2,000 times per 667 m2, can control the most sensitive rice mites, rice mites, cotton small bridge worms, thorn moths and cabbage caterpillars Etc.; use 10 billion spores/g 1000 times solution or BT emulsion 300 times solution to control cabbage caterpillars; use BT emulsion 400-600 times solution to control rice leaf roller, rice locust and sweet potato hawk moth; use BT emulsion 1000 times liquid control of cotton bollworm, cabbage caterpillar, diamondback moth, etc.; control corn borer, can use 10 billion spores / g of bacteria powder, every 667m250g, diluted 2000 times the water, or 100 to 200 times BT per 667m2 The emulsion is thoroughly mixed with 3.5 to 5 kg of fine sand to prepare granules, which are put into the corn bell mouth.
Second, when applying the medicine, you should "see four" to ensure the effectiveness.
When using BT bio-pesticide, you should 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 bio-pesticide is slower than chemical pesticides. The general pests feed on BT bio-pesticides for 30 minutes, 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. Note: BT pesticides cannot be mixed with organophosphorus pesticides and fungicides.
For more information on biopesticides , please pay attention to the Pesticide Information Network ()
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