Microbial Insecticides

Bacteria

Biopesticides based on bacteria have been used to control plant diseases, nematodes, insects, and weeds. Bacteria are present in all soils and are the most abundant micro-organisms in soil samples. Many spore forming and non-spore forming bacteria are known to be effective against a wide spectrum of insects and diseases. Among them, they might act as competitors or inducers of host resistance in plant. Some act by inhibiting growth, feeding, development or reproduction of a pest or pathogen.

The most well-known and widely used of all biopesticides are insecticides based on Bacillus thuringiensis, commonly referred to as “Bt.” Other bacteria are used for the control of plant pathogens. Certain strains of Bacillus subtilis, Bacillus pumilus, and Streptomyces spp. increase yield and prevent plant diseases by outcompeting plant pathogens in the rhizosphere, producing anti-fungal compounds, and by promoting plant and root growth.

 

Bacillus thuringiensis.jpg

bacillus thuringiensis

Target Pests

lepidopterous insects • gypsy moth • cabbage loopermosquitoes • blackflies • midgeswax moth larvae • certain beetle species • boll weevil

 

Chromobacterium subtsugae strain PRAA4-1T

Target Pests

armyworms • cutworms • aphids • psyllids whiteflies • mealybugs • thrips • spider mites • broad mites • russet mites • rust mites

Fungi

Isaria fumosorosea Apopka strain 97

Target Pests

Lepidoptera caterpillars and larvae • Symphylans • whiteflies • aphids, thrips • spider mites • broad mites • rust mites • leafminers • mealybugs, psyllids, and plant bugs • rootworms • wireworms • Coleoptera grubs

beauveria bassiana

Target Pests

Grasshoppers • Whiteflies • Aphids • Thrips • Mealybugs • Leafhoppers • Stem Borers • Armyworms •Cabbage Worms • Leaf-feeding beetles • Scarab beetles • Weevils • Two-spotted Spider Mite