Key points for the correct use of BT biopesticides
BT bio-pesticide is a microbial insecticide that can be used in agriculture and forestry, and has good control effects on lepidopteran pests and pine caterpillars.
Advantages of using BT biopesticide: a broad-spectrum, efficient and safe insecticide that can effectively prevent pests and diseases without harming human, livestock, poultry and natural enemies of pests.
However, improper use of BT bio-pesticide can also lead to reduced or even ineffective efficacy. Then, the following section of China's pesticide network will summarize the "points on the correct use of BT biological pesticides. "
First, when using BT biological pesticides, pay attention to temperature, humidity, sunlight, rain and other factors. Use at 25 ° C ~ 30 ° C, the control effect is 10 ~ 2 times higher than 10 ° C ~ 15 ° C. Therefore, it is best not to use when the temperature is lower than 20 °C; the higher the humidity, the better the control effect. Powder BT can fully exert its effects under high-humidity conditions; in order to avoid the damage of ultraviolet rays to spores in sunlight, it is best to use it after spraying on cloudy or afternoon hours; medium to heavy rain will wash off spraying on plants. The liquid on the stems and leaves, thereby 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.
Second, 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.
Finally, the Chinese pesticide network Xiaobian warm reminder: BT pesticides are slower than chemical pesticides; BT pesticides can not be mixed with organophosphorus pesticides and fungicides .
Regarding the "points on the correct use of BT biological pesticides ", the Chinese pesticide network Xiaobian is summarized here!
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