author(s)
Ravinder Nath, Amit Nath, Satinder Kaur and Gagan Deep

abstract
Okra an important crop attacked by many insect pests, insecticides are widely used tool to manage these insect pests besides, their great role in managing population of insect pests their harmful residues left on the end products. Therefore, the present study on residue dynamics of monocrotophos on okra crop was carried out. Field was sprayed with monocrotophos 36SL at the rate of 0.350 and 0.700 gm. a.i. /ha. Samples were collected from field and carried to laboratory to study the dissipation of monocrotophos on fruits and leaves of okra by GLC after 0, 1, 3, 5 and 7days of treatment. Total recovery of Monocrotophos was observed to be 90%, 89% and 95% at 0.1, 0.5 and 2.5mg/kg fortified fruit samples, respectively. Dissipation was faster on leaves at double dose as compared to normal dose, while on fruits dissipation was faster at normal dose compared to double dose. Dissipation of pesticide was found to be faster on leaves compared to fruits. The half-life of the insecticide ranged between 1.92 and 2.08 days on fruits and 1.18 and 1.02 days on leaves. Waiting period of 7.37 days for normal dose and 8.45 days for double dose was recommended. Okra crop require harvest every 3-4 days due to its fast growing habit. While dissipation rate of Monocrotophos is slow the findings of experiment led to the conclusion that application of Monocrotophos should be restricted for use on okra.