Insecticide's Considerations

The production methods of Bt insecticides mainly include liquid deep fermentation and semi-solid fermentation. The two-step method is an effective, simple and practical Bt insecticide production technology that is improved, improved and created on the basis of semi-solid fermentation method. The production process is simple, the scale can be large or small, and it is especially suitable. The promotion in rural SMEs can significantly reduce the production cost of pesticides and play a positive role in the development of microbial pesticides. In particular, the control effects of vegetable pests such as cabbage caterpillar and diamondback moth are very significant. The control of cotton bollworm and pine caterpillar is also widely promoted.

In field applications, to ensure the quality of pesticides, to meet the temperature conditions for the rapid growth of Bt bacteria, the higher the temperature, the stronger the pathogenicity. Avoid strong sunlight, because ultraviolet rays can cause damage to Bt bacteria, it is best to apply after 4 pm. In addition, attention must be paid to the living habits and sensitivities of the target pests, host crops and environmental conditions, and the use of synergists. For example, the prevention and control of drill collar pests should be carried out 2 times to 3 times during the incubation period of eggs, especially for aphids, and the control effect is good. Once the mites break into the stem, the control effect is poor. In order to control corn borer, it is necessary to strictly control the use of corn at the end of the heart, in order to receive good results. To control cotton bollworm, it should be applied 2 to 3 days after the peak of ovulation, and the effect is remarkable. The masses have the experience of controlling insects and not seeing insects, and fighting eggs without pests. In this way, when the larva hatches, the insecticide is eaten in the stomach when it bites the egg shell, and it is quickly poisoned and died. The residual period of B2 insecticide can generally reach 7 days to 10 days. If it rains after application, the rain will wash away the liquid and should be re-sprayed.

The application method can be spray, dusting, filling, aircraft spraying, and the like. Either way, it is necessary to apply the drug evenly to ensure that the pest has a chance to eat, in order to play a poisonous killing effect. Bt insecticides are added with a small amount of chemical pesticides, or mixed with other microbial pesticides, which can play a synergistic effect and significantly increase the mortality of pests. Bt insecticides and other biological agents compound biological pesticides have a wider spectrum of insecticides and are welcomed by the masses.