Microbial insecticides and biological pesticides

Microbial Insecticides And Biological Pesticides

There are many kinds of microbial insecticides, more than 2000 have been found, according to the classification of microorganisms can be divided into bacteria, fungi, viruses, protozoa and nematodes. At present, bacteria insecticides, fungi insecticides, virus insecticides and antibiotic insecticides are the main research and application products in China.

The bioinsecticides are mainly divided into three categories: Bacillus thuringiensis, insect virus and plant extract. They are characterized by convenient material collection, low cost, long control period, high efficiency, economy, safety, no pollution, high compatibility with the environment, etc. It is the best choice for producing green vegetables without pollution at present.

  1. Bacteriological insecticides

Bacterial insecticides are the most widely used microbial insecticides in China. At present, the varieties studied and applied are Bacillus thuringiensis, Bacillus japonica and Bacillus globosa, among which Bacillus thuringiensis is the most representative variety. Bacillus thuringiensis (Bt) (Bacillus thuringiensis) is an important insect pathogen which can produce parasporal crystal toxin and has a wide host spectrum and is a gastric toxic insecticide. Bacillus thuringiensis has different toxic effects on a variety of agricultural pests, including cotton bollworm, tobacco worm, Spodoptera nigra, litura, beet moth, small ground tiger, rice leaf roller Corn borer, Plutella xylostella and tea caterpillar have good effect on the forest pest Dendrolimus. In addition, it can be used to control mosquito larvae and stored grain moth pests.

2. Fungal insecticide

Fungal insecticide is a kind of insect pathogenic fungi with broad parasitic spectrum and is a contact microorganism insecticide. At present, the main types of research and utilization are: Beauveria bassiana, Metarhizium anisopliae, Paecilomyces sp. 1 Beauveria bassiana is the longest and most widely used fungal insecticide in China. 2 Metarhizium anisopliae is a broad-spectrum insect pathogen. In foreign countries, the area of pest control was larger than that of Beauveria bassiana, and the control effect was comparable to that of Beauveria bassiana.