EVALUATION OF BACILLUS thuringiensis (BERLINER) FORMULATIONS AGAINST THE PINK BOLLWORM PECTINOPHORA gossypiella (SAUND.)

Laboratory experiments were carried out to investigate the effect of two bacterial commercial products of B. thuringiensis (Dipel 2x and Protecto) on eggs and the newly hatched larvae of pink bollworm, P.gossypiella. Different concentrations of both commercial products of B. thuringiensis were tested. The results showed that the percentage of larval mortality increased by increasing concentration and the period after treatment, calculated LC50s values after 3-7 days of treatment. Treatment of eggs did not affect, significantly, the hatchability. While the percentage mortality of newly hatched larvae produced from the treated eggs was high according to the concentrations used

IDENTIFICATION AND EFFICIENCY OF BACTERIAL STRAINS ISOLATED FROM INFECTED LARVAE OF COTTON PINK BOLLWORM Pectinophora gossypiella AND SPINY BOLLWORM Earias insulana (LEPIDOPTERA: NOCTUIDAE)

From infected pink and spiny bollworm larvae, collected from Qualyobia Gover-norate, Egypt, 13 bacterial isolates belonging to 7 species were detected. The effi-ciency of these bacterial isolates was evaluated on newly hatched pink and spiny bollworm larvae. Three bacterial species, namely, Pseudomonas viridiflava, Serratia grimesii and Cellulomonas flavigena had no efficiency. Meanwhile, four other en-tomopathogenic isolates bacterial species, Pseudomonas pyrrocinia (A1), Serratia marcesens (M3), Serratia rubidaea (E3) and Bacillus thuringiensis (S2) had notice-able efficiency. The efficiency of these isolates was compared to two commercial products, Dipel 2X and Protecto. Biochemical studies showed differences in total proteins bands patterns in uninfected and infected larvae