Beauveria Bassiana is a pathogenic fungus. Applying under appropriate environmental conditions, it can be subdivided to make the spores. After the spores are connected with insects, they can adhere to the epidermis of the pests. It may dissolve the outer shell of the insect and invade the host body to grow and reproduce.
It will start to consume a lot of nutrients within the body of germs and form a large number of mycelium and spores inside the human body of insects. In the meantime, Beauveria Bassiana can also create toxins like Bassiana, Bassiana Oosporin, and Oosporin, which disturb the metabolism of those pests and finally lead to death.
One beauveria bassiana’s mode of action is producing Beauverin (Non-ribosomal Polypeptide Toxoid), Oomycin (Benzoquinone Toxoid), and Calcium Oxalate Crystals, which can cause insect poisoning, disrupt metabolism and kill them.
Another beauveria bassiana’s mode of action is that spores can penetrate the body wall of the insect, multiplies in the insect body, absorbs nutrition and moisture in the insect body, and then kills the target pest by destroying the structure of pest. The affected pests will turn to white all the body. Like metarhizium anisopliae, trichoderma and bacillus subtilis, the beauveria bassiana is harmless to humans, animals, no pollution on crops. However, the beauveria bassiana should be kept away from the silkworm. It has continuous infectivity to pests, and the pests can be continuously infected.
More info of Beauveria Bassiana Mode of Action: https://doraagri.com/biological-insecticide-beauveria-bassiana-for-bed-bugs/