The selectivity of eight commercial herbicide products with glyphosate formulations (Roundup®, Roundup® WG, Roundup® Transorb, Polaris®, Gliz® 480 CS, Glifosato Nortox®, Glifosato 480 Agripec® and Zapp® Qi) registered in Brazil, was assessed in relation to the immature stages of the egg-parasitoid Trichogramma pretiosum, as well as to their effects on the emerged adults, under laboratory conditions (temperature 25±1 °C, relative humidity 70±10%; photophase 14 hours and brightness 500 lux). The bioassays consisted of herbicide spray at the concentration of 14.4 mg L-1 of equivalent gliphosate acid on eggs of Anagasta kuehniella containing the immature stage egg-larva, pre-pupa and pupa of T. pretiosum. Reductions observed in adult emergence, compared to the control, were used to measure the effects of the treatments. Eggs from the host A. kuehniella were presented to the adults of the parasitoids emerged from the sprayed pupae, with the parasitism of T. pretiosum being evaluated in each treatment compared to the control. No significant harmful effect was observed for any of the herbicides assessed when sprayed at the different immature stages of development of T. pretiosum, in agreement with IOBC. The parasitism of the adults emerged from eggs sprayed at the pupa stage was not affected either.
biological control; herbicide; natural enemy; egg-parasitoid; toxicity
