LABORATORY EVALUATION OF THREE DIFFERENT BIOCIDES AGAINST THE FIELD COTTON LEAF WORM STRAINS Spodoptera Jittora/is (Boisd.) | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 5, Volume 30, Issue 10, October 2005, Page 6293-6300 PDF (2.36 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2005.239232 | ||||
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| Authors | ||||
| Hala M. Abou-Yousef1; Nairouz R. Girgis1; Omayma K. Moustafa2 | ||||
| 1Centeral Agricultural Pesticides Laboratory, Agricultural Reasearch Center, Dokki, Egypt. | ||||
| 2Centeral Agricultural Pesticides Laboratory, Agricultural Reasearch Center, Dokki, Egypt | ||||
| Abstract | ||||
| Laboratory tests were conducted to determine the efficien~ of Abamectin 1.8% EC, Xentari 10.3% Granule and MVPII 20% FL against the 2" instar larvae of Monofia, Gharbya and Sehera field strains of the cotton leafworm Spodoptera /ittora/is . Manshiat Ganzor, Ewasna and Etay EI-Sarod water were used for dilution of the biocides concentrations and were tested against for Gharbya, Monofia and Sehera strains. The results indicate that Abamectin at the different concentrations caused high mortality after 14 days to the 2nd instar larvae of the three tested field strains. All larvae tested failed to reach successful pupation. Sehera cotton leafworm strain was the most susceptible to MVPII while Monofia strain was the least. The L T 50 "s for Monofia, Sehera and Gharbya strains were 7.46, 2.70 and 4.69 days at the concentration of 10. OOml/L. The data also revealed that the 2"d instar larvae of Sehera strain was more susceptible to Xentari than the larvae of Monofia and Gharbya. The L T 50 • S were 2.44, 1.99 and 4.74 days at the concentration of 0.6m1/L for Monofia, Sehera and Gharbya strains, respectively. Data showed that pH, conductivity and salinity for Sehera (Etay EI-Barod) water were higher than that of Gharbya (Manshiat Ganzor) and Monofia (Ewasna) water. The usage of Sehera water for dilution resulted in increasing the toxicity of the tested biocides for the larvae of the cotton leafworm. This phenomenon can be benefits since the great majority of waters used for dilution in Egypt are alkaline. Increasing in toxicity as a result of increasing conductivity may be due to augmenting penetration of the toxicant. | ||||
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