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Space Treatment of Warehouses Using Dichlorvos 1)
Author(s) -
Ashman F.,
Webley D.J.,
Achillides N.Z.
Publication year - 1974
Publication title -
eppo bulletin
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.327
H-Index - 36
eISSN - 1365-2338
pISSN - 0250-8052
DOI - 10.1111/j.1365-2338.1974.tb02391.x
Subject(s) - sprayer , dichlorvos , toxicology , infestation , pest analysis , lasioderma serricorne , biology , horticulture , warehouse , larva , botany , pesticide , agronomy , geography , archaeology
Details are given of the performance of Vapona Pest Strips and of an automatic dichlorvos sprayer developed to prevent infestation of clean or fumigated stored commodities, for infestation control on stored carobs. Air concentrations after spraying a nominal dose of 10 μg/1 of total store space averaged approximately 1.0. μ g/l after 30 minutes and less than 0.3 μ g/l after 3 hours. Residues found on carobs after daily spraying of stores at 10 μ g/1 for 96 days were in the range of 0.2 ‐ 2.0 ppm. Ephestia cautella Walk, and Lasioderma serricorne (F.) become established in carobs after harvest and are the principle pests causing damage during storage. Effective control of E. cautella was obtained by using Shell Vapona Pest Strips at two strips/100 m 3 or by daily spraying of dichlorvos at 10g/1,000 m 2 (10μ g/1). No effect was observed against migrating larvae of E. calidella (Guen.) or E. figulilella Greg, nor against Bracon hebetor Say., the hymenopterous parasite attacking all three Ephestia species. The automatic dichlorvos sprayer is equipped to apply a predetermined dose at time of peak flight activity, 18–20 hours each evening. On stored carobs, no spraying is needed after October because the commodity temperature falls below 20 0 C, too low for active development of the pest species. 23 automatic sprayers are now used in Cyprus to protect the whole carob crop from storage pests.