Effects of different factors on the residues of heptenophos in cucumber.
The present study was conducted to determine the effects of various factors on residues of heptenophos in cucumber under field conditions. Heptenophos (EC50) was sprayed at recommended close (1/1000) and double dose (2/1000). The effects of peeling and repeated application on residues level were also examined. Samples were collected at different time intervals and residues of heptenophos were determined using GC. Six hours after application 9.96 and 2.5 mg/kg heptenophos were recovered on the cucumber from the above treatments respectively. The residues of heptenophos in cucumber decreased rapidly in both treatments and reached a low level after five days (0.2 and 0.1 mg/kg respectively). Two times application of heptenophos caused no insecticide accumulation in cucumber. This investigation revealed that peeling the fruits did not reduce total residues in cucumber.
Talebi
K
K
Dept. of Plant Protection, College of Agriculture, University of Tehran, Karaj, Iran.
Shaikhi
A
A
D018553:Cucumis sativus / Q000737:chemistry*; D004305:Dose-Response Relationship, Drug; D007306:Insecticides / Q000032:analysis*; D007492:Iran; D009943:Organophosphorus Compounds / Q000032:analysis*; D009946:Organothiophosphorus Compounds; D010573:Pesticide Residues / Q000032:analysis*
D007306:Insecticides; D009943:Organophosphorus Compounds; D009946:Organothiophosphorus Compounds; D010573:Pesticide Residues; C014022:heptenophos