A population (SERD3) of the diamondback moth (Plutella xylostella L.) with field-evolved resistance to Bacillus thuringiensis subsp. kurstaki HD-1 (Dipel) and B. thuringiensis subsp. aizawai (Florbac) was collected. Laboratory-based selection of two subpopulations of SERD3 with B. thuringiensis subsp. kurstaki (Btk-Sel) or B. thuringiensis subsp. aizawai (Bta-Sel) increased resistance to the se...

4. T. L. Harvey and D. E. Howell, J. Econ. Entomol. 7, 92 (1965). 5. Insects were collected from infested bins as larvae or pupae in strips of corrugated paper placed on the grain surface. The paper containing insects was returned to the laboratory and placed in jars, where adults emerged. Eggs were collected from these adults and used to start colonies on the standard laboratory larval diet of...

Toxicity of 17 commonly used insecticides used to control diamondback moth, Plutella xylostella (L.) was evaluated against adults of Cotesia plutellae Kurdjumov. The insecticide concentrations studied were equivalent to those recommended in the field. Adults of the parasitoid were released into exposure kits with fresh dry insecticide film for 24 hours, at which time mortalities were noted. The...

Most, and perhaps all, multicellular organisms house symbiotic microorganisms. Recent research identified a number of ways in which symbionts are critical to the success of various insects, yet we know very little about the symbiotic associations of the major invasive species. The information we do have is largely limited to two specific types of relationships, insect vectors of plant pathogens...

Bacillus thuringiensis Berliner is not toxic to humans and a treated field can be entered immediately. Therefore, viable B. thuringiensis spores remaining on the plant, live larvae on the plant, and insecticidal activity of the crystal toxin can be measured over time. When B. thuringiensis is applied to corn as a spray or granular formulation, ultraviolet light and rainfall destroy much of the ...