DISSIPATION RATE OF CERTAIN INSECTICIDES ON TOMATO PLANTS AND THEIR BIORESIDUAL ACTIVITIES AGAINST SPODOPTERA littoralis (BOISD.)

Document Type : Original Article

Authors

Central Agricultural Pesticides Laboratory, Agricultural Research Center, Dokki, Giza, Egyp

Abstract

Field trials were conducted at El-Gharbia governorate to determine the
insecticidal activities of chlorpyrifos-methyl, profenofos and methomyl on tomato
plants against the cotton leaf-worm (Spodotera littoralis). Data showed the high
initial mortality (100, 100 and 100%) against the second and the fourth instars larvae
with reasonable persistence. The residues of these insecticides on fruits of the
sprayed and contaminated tomato plants were determined by GLC and HPLC, with
recoveries of 100, 100 and 94.58%, respectively. The initial deposits of
chlorpyrifos-methyl, profenofos and methomyl were 2.10, 2.58 and 20.11ppm, while
decreased to 0.19, 1.41 and 0.33ppm after 3,1 and 13 days from spraying,
respectively, such residue levels are below the maximum residue level (MRL). The
estimated half-life values (t0.5) were 0.4898, 1.026 and 1.1867 days for the same
insecticides, respectively

Keywords

Arab Universities Journal of Agricultural Sciences
Volume 13, Issue 3
September 2005
Pages 989-996

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