Avaliação do potencial inseticida de compostos N,S-acetais sob o ciclo de vida da Plutella xylostella (L.) (Lepidoptera: Plutellidae)

Abstract

The need for new technologies and effective products for the control of Plutella xylostella (L., 1758) (Lepidoptera: Plutellidae) has motivated several research groups around the world to describe new synthetic protocols with effective insect control. The objective of the present research was to determine the insecticidal activity of N, S-acetal compounds synthesized using Pig Pancreatic Lipase (PPL) as biocatalyst under the P. xylostella life cycle. For this, N, S-acetals compounds were synthesized with different groups, being methyl group (TB1), fluor group (TB2), methoxy group (TB3) and hydro group (TB4) and evaluated on P. xylostella life cycle. Caterpillars fed on compound TB3 were approximately 5 days old, being the shortest period among treatments, while treatment TB4 was the longest. Regarding larval survival and pupal duration, a reduction was observed in all TB treatments. Pupal survival decreased in TB1 and TB3. The number of couples formed for the treatments varied, with five couples formed for water, TB2 and TB4. Treatments TB1 and TB3 were 2 and 4 couples respectively. There was no difference between treatments for the number of eggs produced, but there was a marked reduction in viability in TB3 and TB4, causing reduction in the formation of new caterpillars. Further studies should be conducted to assess their toxicity over time.