Staff Members - Benha University
DISSIPATION RATE OF NETHOMYL IN CLOVER FIELDS AND ITS BIORESIDUAL ACTIVITY AGAINST THE EGYPTIAN COTTON LEAFWORM SPOOOPTERA LITTORALIS (WISED)
• 1991
Publication Information
Authors
E.A.Abdalla* and A.Shams,E1-Dine**
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publication.type
Local
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Abstract
The residual behaviour of methomyl sprayed on clover fields at recommended rate was studied. Samples analysed by High Performance Liquid Chromat-ography revealed that the initial deposits was 22 ppm, dropped to 12.1 ppm and decreased to 11.4 ppm within the first three days after spraying. A gradual degradation occured, after this initial fast deterioration period, the residues decreased to reach 1.6 ppm and 1.5 ppm after 12 and 16 days of spraying , respectively.
Methomyl also showed high initial toxicity against the second and fourth instars of the cotton leafworm with reasonable persistance; the percent mortality against both instars amounted to 56.97. throughout the experimental period. The results emphasize that methomyl could be one of the most promising insecticides against S.tittO4a-b-6 larvae.
Methomyl also showed high initial toxicity against the second and fourth instars of the cotton leafworm with reasonable persistance; the percent mortality against both instars amounted to 56.97. throughout the experimental period. The results emphasize that methomyl could be one of the most promising insecticides against S.tittO4a-b-6 larvae.