Assessment of acetic acid like fumigant of silverleaf whitefly Bemisia tabaci (Gennadious) in laboratory and field
DOI:
https://doi.org/10.29312/remexca.v3i3.1438Keywords:
biofumigants volatile fatty acids, vegetal protectionAbstract
The aim of this work was to assess the capacity of acetic acid (AA) like fumigant against Bemisia tabaci (silverleaf whitef ly) which is a pest of national importance. In laboratory, the bug was fumigated with three doses-time regimes: (both media), low dose-long time and high dose-short time. In f ield, squash leaves of four varieties were fumigated with 8, 16 and 32 μg ml-1 of AA during of 20, 40 and 60 min; additionally, it was assessed damage in foils (phytotoxicity) af ter fumigation. In laboratory, fumigation time > 15 min and 8 μg ml-1 of AA killed100%ofwhitefly,whileitssurvivalwasreduced40% when fumigated eight hours with 2 μg ml-1 of AA; but control incubation (whitef ly without fumigation) during ≥ 16 h also reduced its survival; meanwhile, with 8 and 16 μg ml-1 of AA the pest survival was reduced since five minutes (~20-80%). Infield,thewhiteflysurvived~40%inleavesoffourvarieties afterfumigatingwithAA(8-32μgml-1)during20min,butpest practically did not survive when increasing fumigation time to 60 min. The leaves showed severe damage (phytotoxicity) > to 50% except in dose of 8 μg ml-1 at 20 min with damage of ~ 20%. Alternative to use of AA like fumigant are discussed.
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