BIOACTIVITY OF DIPEL 2X, A COMMERCIAL PREPARA-TION OF BACILLUS THURINGIENSES BERLINER AGAINST THE COTTON LEAFWORM SPODOPTERA LITTORAL'S (BOISD.) | ||
| Egyptian Journal of Agricultural Research | ||
| Volume 71, Issue 1, March 1993, Pages 175-183 PDF (1.94 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejar.1993.455746 | ||
| Author | ||
| SAWSAN M. ABDEL-HALIM | ||
| Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt | ||
| Abstract | ||
| The insecticidal activity as well as the latent effect of Dipel 2x , a commercial preparation of Bacillus thuringienses var. Kurstaki (Berliner) were evaluated in the laboratory . The 2nd instar larvae of the cotton leafworm Spodoptera littoralis (Boisd.) were fed on a diet surface treated with various doses of Dipel 2x, i.e. 64, 192, 320, 5120 and 6400 IU/ ml at 27+2°C and 55 - 60% R.H. Data of initial and latent mortality revealed that Dipel 2x had slight insecticidal activity against the cotton leafworm. The ability of larvae to recover decreased with the increase in concentration or / and feeding time . Both larval and pupal duration were remarkabley prolonged with dose increase, while pupation percentage was reduced . Remarkable latent adverse effects were detected on adult emergence, fecundity and egg viability, particularly with doses above 320 IU/ml. | ||
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