120.
There is increasing demand for new products for vegetable pest management. Thus, the aim of this study was to assess the toxicity of pyrethroids with acid moiety modifications to measure the insecticidal activity of these compounds on the lepidopteran vegetable pests
Diaphania hyalinata (L.) (Lepidoptera: Pyralidae) and
Asciamonuste (Latreille) (Lepidoptera: Pieridae) and evaluate their selectivity for the predatory ant
Solenopsis saevissima (F. Smith) (Hymenoptera: Formicidae) and pollinator
Tetragonisca angustula (Latreille) (Hymenoptera: Apidae: Meliponinae). Racemic mixtures of five new pyrethroids (30 µg molecule mg
?1 insect body weight) resulted in high (100%) and rapid (stable LD
50 after 12 h) mortality in
D. hyalinata and
A. monuste. In
A. monuste, the
trans-pyrethroid [
12] isomer showed similar toxicity to permethrin. For
D. hyalinata, the trans-pyrethroid [
9] isomer and
cis-pyrethroid [
10] isomer were as toxic as permethrin. Due to their low selectivity, these new pyrethroids should be applied on the basis of ecological selectivity principles to minimize impacts on nontarget organisms
S. saevissima and
T. angustula.
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