EFFICIENCY OF THE BIOINSECTICIDE, AGERIN (Bacillus thuringiensis) ALONE AND ITS MIXTURE WITH THREE INSECTICIDES AGAINST COTTON LEAFWORM Spodoptera littoralis (BOISD.) | ||
| Journal of Plant Protection and Pathology | ||
| Article 5, Volume 33, Issue 4, April 2008, Pages 2863-2871 PDF (774.34 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jppp.2008.217776 | ||
| Author | ||
| Laila R. A. Elgohary, | ||
| Pesticide Dept., Faculty of Agricultural , Mansoura University, Egypt. | ||
| Abstract | ||
| The Efficiency of the bioinsecticide, Agerin (Bacillus thuringiensis) alone and its mixtures with three insecticides on cotton leafworm Spodoptera littoralis ( Boisd.) was investigated . Data indicated that Lufenuron was the highest effective insecticides against both the 2nd and the 4th instar larvae of S. littoralis followed by Chlorfluazuron , Chlorpyrifos and B.t , respectively . All tested mixtures decreased the toxicity according to Co-Toxicity factor . The tested mixture (B.t + Chlfluazuroorn) gave the high level of antagonism effect followed by the mixture (B.t + Lufenuron) . Concerning the joint action of combination (B.t + Chlorpyrifos) , it produced additive effect when tested on the 2nd instar larvae, while it gave antagonism effect when tested on the 4th instars larvae of S. littoralis . The field efficiency of tested insecticides (when used singular) can be arranged according to the general mean of reduction percentage during two seasons in a descending order as follows : Chlorfluazuron , Chlorpyrifos , Lufenuron and B.t they were 89.26, 82.60, 77.83 and 67.15%, respectively . The addition of B.t to Chlorpyrifos gave raising the general mean of reduction percentage for two seasons, in contrast the other two tested insecticides gave a reduction but less when applied without added to Bt . The same trend were obtained when applied three tested insecticides at the half recommended rate alone or mixed with the same dose of Bt on S. littoralis but with less level of reduction . | ||
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