Beauveria bassiana

From Cyberlaw: Difficult Issues Winter 2010
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What's Beauveria Bassiana?

With the destruction of environmental pollution and ecological balance by chemical pesticides has become the focus of global attention, biological pesticide control technology has received more and more attention. There are more than 700 kinds of parasitic pests of Beauveria bassiana. Compared with traditional chemical pesticides, Beauveria bassiana biological pesticides have the natural advantages of no chemical pesticide residues, no resistance to pesticides, and strong specificity.

Beauveria bassiana is a biological pesticide with the potential to prevent underground pests, and it is a new type of biological pesticide that is most likely to be successfully industrialized after BT toxin.

Compared with chemical pesticides, fungal insecticides have the disadvantages of low insecticidal rates and slower insecticidal speeds. Therefore, many countries will mix fungal preparations with chemical pesticides to make up for the shortcomings of biological insecticides. Greatly reduce the use of chemical pesticides.

The most widely used fungal insecticide commercially is Beauveria bassiana. And the most successful prevention and control are grubs, corn borers, pine caterpillars, green leafhoppers, and other pests in nurseries, lawns, farmlands and other places. It has a huge potential market and economic benefits.


(1) Green and environmental protection, safe and reliable: This product is a fungal bio-insecticide, and Beauveria bassiana has no oral toxicity problem to humans and animals. Since then, the field poisoning caused by the use of traditional pesticides can be stopped. It has fundamentally solved the pesticide residue and food safety problems caused by chemical pesticides, especially organophosphorus pesticides, for many years.

(2) Unique insecticidal mechanism, no resistance

(3) Repeated infestation, long-term effect, one-time application, no insects throughout the season: suitable soil environment is especially suitable for the growth and reproduction of Beauveria bassiana, which can use the nutrients in the pests to multiply and produce a large number of spores to continue It infects other pests and is highly contagious.

(4) Promote crop growth, increase production and income: This product is processed by using the culture medium in the fermentation process of Beauveria bassiana as the carrier of the product. The carrier is rich in a large number of amino acids, peptide enzymes, trace elements, and other crops produced by fermentation. The nutrients necessary for growth can promote crop growth and effectively improve crop yield and quality.

(5) High selectivity: Beauveria bassiana can actively avoid the infestation and attack of beneficial insects such as ladybugs, lacewings and aphid flies, effectively protecting natural enemies of pests, thereby improving the overall field control effect.

Mode of Action

The infection is mainly through contact with insect epidermis, and secondly, it can also be infected through the digestive tract and respiratory tract. The way of infection varies with insect species, insect state, environmental conditions, etc.

Studies have shown that strains of Beauveria bassiana briefly grow on the body wall of the larvae of cotton bollworm to form an invasion structure. These hyphae will absorb nutrients from the pests and eventually lead to the death of the pests.

There are two ways to infect black-tailed leafhoppers. The first is to infect through the skin. The germinated conidia grow out germ tubes at the internode membrane where the chitin is thin on the body wall of the worm. The enzyme secreted at the tip of the germ tube can dissolve the chitin into a small hole, and the germ tube enters the worm body. At this time, the infection is about 24 hours.

The germinated germ tube continues to elongate forward by the action of enzymes, until the hyphae produced by the epithelial cells of the body wall also enter the body wall, and then invade the hemolymph tissue. The hyphae develop and grow along the cell membrane at first, and then pass through the cell membrane into the cell. , So the protoplasm and nucleus are inactivated, the nutrients are exhausted, and a large amount of disintegration disappears.

The destruction of a large number of subcutaneous cell layers is the result of hyphae infection in the body cavity. At this time, the hyphae are surrounded by insects and blood cells in the body, the blood cells appear vacuoles, and the coloring power is reduced. At the same time, the mycelium produces many spores. After germination, the spores produce new hyphae, which proliferate repeatedly and break through the blood cell barrier into the body cavity. In the body cavity, it reproduces in the form of blastospores, conidia, etc., and spreads to all tissues of the worm body. Such as the digestive tract, Martensian tube, fat body, etc., at this time, the infection is about 48 to 72 hours.

After 96 hours of infection, most of the insect tissues and organs are destroyed, and the hyphae are bundled out of the body surface to form aerial hyphae, and begin to form conidiophores and conidia. After 120 to 118 hours of infection, a large number of aerial hyphae, conidiophores, and conidia grow on the surface of the worm and release. At this time, except for part of the body wall, other tissues are destroyed and nutrients are also exhausted.