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The aim of this work was to assess the capacity of acetic acid (AA) like fumigant against Bemisia tabaci (silverleaf whitefly) 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 field, 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) after fumigation. In laboratory, fumigation time > 15 min and 8 µg ml -1 of AA killed 100% of whitefly, while its survival was reduced 40% when fumigated eight hours with 2 µg ml -1 of AA; but control incubation (whitefly 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%). In field, the whitefly survived ~ 40% in leaves of four varieties after fumigating with AA (8-32 µg ml -1 ) during 20 min, but pest 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.

Evaluación de ácido acético como fumigante de mosquita blanca Bemisia tabaci (Gennadious) en laboratorio y campo