SELECTIVITY OF INSECTICIDES USED IN THE CONTROL OF Spodoptera frugiperda (J. E. SMITH) (LEPIDOPTERA: NOCTUIDAE) FOR EGGS AND NYMPHS OF Doru luteipes (SCUDDER) (DERMAPTERA: FORFICULIDAE)

Abstract

Doru luteipes (Scudder) (Dermaptera: Forficulidae) is considered an efficient predator and studieshave shown the possibility of using the natural enemy to control Spodoptera frugiperda (J. E. Smith) (Lepidoptera:Noctuidae) in maize (Zea mays L.). The aim of this study was to evaluate the effects of insecticides registered forthe control of S. frugiperda in crop corn on eggs and first instars nymphs of the predator D. luteipes. The viabilityof eggs treated with insecticides and insect survival rate in each instar were evaluated. After 96 hours of exposure,all insecticides were classified as harmful (class 4) for the first instars nymphs of D. luteipes. As for the egg viabilityof D. luteipes, triflumuron, thiamethoxam + λ-cyhalothrin and teflubenzurom + α-cypermethrin were toxic (class 4);clofenapir and spinosad slightly harmful (class 2) and etofenprox harmless (class 1). The insecticides showed nophysiological selectivity to nymphs of D. luteipes and should be evaluated under semi-field and field conditions inorder to confirm the results obtained in real conditions of the culture.

Keywords

• biological control
• chemical control
• earwigs
• toxicity
• Zea mays
• Dermaptera