Talk about the use of BT insecticide on vegetables
It is reported in the newspaper that BT insecticide is used to kill pests. Many vegetable farmers called, some asked how to use BT pesticides, and some talked to reporters about the experience of using BT pesticides in vegetable production. The reporter sorted out the experience of the vegetable farmers who called. BT insecticides, namely Bacillus thuringiensis microbial insecticides, contain parasporal crystals and sporotoxins that kill pests, which are effective in killing pests, and it is difficult to produce drug resistance in use. However, in practical application, due to the lack of methods, the effect is not satisfactory. In order to improve the control effect of BT insecticides, the following requirements must be mastered: first, grasp the reasonable application concentration. Because the species of pests in the greenhouse are different, the sensitivity to BT insecticide is also different, so the application concentration is different. Only by selecting the appropriate concentration according to the sensitivity of pests can a good control effect be obtained. 500ml 1000 times solution can be used against Pieris rapae. Secondly, determine the appropriate application time. The efficacy of BT insecticide was slower than that of chemical insecticides, and the time of application should be 2 ml 3 days earlier than that of chemical insecticides, and the effect was the best from egg incubation to 1st instar larvae. Third, spray should also pay attention to the temperature. When the strong light and temperature are above 25 ℃, it is suitable to apply it at about 5 pm. When spraying, the front and back of the leaves should be sprayed through to improve the efficacy. In addition, in order to improve the control effect of pesticides, especially in the occurrence of pests can be mixed with a variety of pesticides, but must not be mixed with fungicides.
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Why is it forbidden to use insecticides in litchi flowering period?
Experimental research and production practice have proved that the pollination of litchi at flowering stage is the guarantee of high yield of litchi, and the honey brewed by bees collecting pollen is also a natural health food for human beings. In order to prevent bee poisoning and honey pollution, ensure that there are enough workers to collect nectar, improve the effect of pollination and protect human health.
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Spraying time of rice insecticides
It is the basic common sense that farmers do not spray insecticides on rainy days, but many farmers often spray them at noon on sunny days, which is very undesirable and harmful, because: 1. At noon, the light is strong. Pests hide in the back of leaves and stems, and the insecticidal effect is poor. 2, the medicine swings late under high temperature and strong light.
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