First, the prevention and treatment of the object 1. Economic crops: cotton bollworm, red bollworm, bridge worm, tobacco budworm, etc. 2, vegetables: cabbage caterpillars, diamondback moth, rapeseed and so on. 3. Grain crops: Chilo suppressalis, Sanhua carp, rice borer, rice leaf roller, corn borer, etc. 4, fruit trees: pine caterpillars, peach small heartworm, ruler, big bag moth, leaf roller moth and so on. Other pests such as cabbage caterpillar, tobacco budworm, bean hawk moth, bridge worm, corn borer, pine caterpillar and fruit tree pests can be applied at the peak of spawning or at the young age. Second, the dilution concentration The dilution concentration should be determined according to the content of each manufacturer's product. For example, the dilution concentration of raw green Bt produced in Wuhan is: 380-1000 times of cabbage caterpillar, rice borer, and larvae; 500-800 times of diamondback moth, pine caterpillar, and tobacco budworm; 250-500 times of cotton bollworm and rice leaf roller Corn mash can be made into 30 times granule snack with coarse sand or 300-500 times liquid. Third, the use should be done four times When you look at the temperature, the temperature is 25~30°C, and it is better not to use it below 20°C. Second, look at the humidity, the greater the environmental humidity, the better its effectiveness. Spraying powdery Bt pesticides should be carried out in the morning and evening when there is dew, so as to facilitate the adhesion of the microbial agents to the stems and leaves, and promote the propagation of spores, increasing the chance of contact with the pests, thereby improving the insecticidal effect. Third, look at the sun, in order to avoid the ultraviolet light on the bacterial spores, the use time is best on cloudy or sunny afternoon after 16:00, if you can add raw molasses or corn syrup or washing powder to the powdered Bt pesticide, Its control effect is better. Fourth, look at the rain, in order to ensure the efficacy of the drug, the use of the weather forecast must be used to ensure that there is no medium to heavy rain within 1 to 2 days after application, should choose cloudy or light rain application, after the spray to medium heavy rain, then Need to make up the spray.
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