What is Bacillus thuringiensis?

What is Bacillus thuringiensis? Which pests can be controlled by Bacillus thuringiensis? Also ask the netizens who know to help introduce that Bacillus thuringiensis, also known as Bt, is currently the most productive and widely used biological insecticide. Bacillus thuringiensis insecticides have the advantages of specificity, high efficiency and safety to human and animals. at present, there are more than 100 commercial preparations of Bacillus thuringiensis, which is the most widely used, largest and most effective microbial insecticide in the world. therefore, it has attracted more and more attention. Therefore, the farming network has sorted out the insecticidal principle, control objects and matters needing attention of Bacillus thuringiensis, which are listed in detail below for netizens' reference. Pests that can be controlled by Bacillus thuringiensis: Bacillus thuringiensis has outstanding effects on pests such as Lepidoptera, Coleoptera, Diptera, Hymenoptera, Homoptera, such as cabbage worm, diamondback moth, sweet moth, Spodoptera litura, cabbage armyworm, tobacco worm, corn borer, rice leaf borer, Chilo suppressalis, tea caterpillar, tea black moth, heart borer, inchworm, rice bract and so on. The insecticidal principle of Bacillus thuringiensis: Bacillus thuringiensis is a microbial insecticide with low toxicity, which is mainly stomach poison. The main components of Bacillus thuringiensis are bacterial toxins and spores, and the mode of action is stomach poison. Bacillus thuringiensis can produce two kinds of toxins, endotoxin and exotoxin. After the pest swallows the bacterial powder, the pest will stop feeding quickly and no longer harm because of the toxin. Finally, the exotoxin action of the pest is slow because of hunger and death, and the effect is obvious in molting and metamorphosis. These two periods are the peak of RNA synthesis, and exotoxin can inhibit DNA-dependent RNA polymerase. Bacillus thuringiensis was poisoned and stopped eating 1-2 hours after the pest swallowed the bacterial powder. at the same time, the bacterial powder germinated and multiplied in large numbers, resulting in the death of the pest. The whole process is generally 1-2 days, so it should be used 2-3 days earlier than conventional chemicals, and the effect is better in the young age of pests. The residual period of Bacillus thuringiensis is about 10 days. Bacillus thuringiensis points for attention: first, Bacillus thuringiensis can only give full play to its role when the temperature is high (usually above 20 degrees), so the application effect is the best from July to September; the application of Bacillus thuringiensis should be 2-3 days earlier than the use of chemical pesticides. Note that Bacillus thuringiensis is non-toxic to bees and fish, but highly toxic to silkworms, so it should be used with caution in sericulture. Note 3. Bacillus thuringiensis should not be mixed with fungicides in the process of application. What is a grub? How to control grubs? What is Emamectin Benzoate?