Produtos formulados a base de óleos essenciais para o manejo de populações de traça-das-crucíferas, Plutella xylostella (L.) (Lepidoptera: Plutellidae), resistentes ao ingrediente ativo deltametrina

Abstract

The diamondback moth, Plutella xylostella (L.) (Lepidoptera: Plutellidae), is a severe pest that can reduce in 95% the brassicas quality and the main method of control is with synthetic insecticide and a pest, In excessive and successive applications, can acquire resistance to active ingredient of the product. For reduce insect resistance to insecticides there are alternative forms control, and one of them is the use of botanical insecticides. Thus, this thesis had as objective to evaluate the insecticidal activity of formulations with essential oil (EO) as active ingredient, as well as mixtures thereof, for use in P. xylostella control, assisting in integrated pest management, reducing environmental impacts and damage to agricultural production. The insecticidal activity was evaluated by bioassays of antifeedant, larval and ovicidal toxicity, compared with insecticides Decis®, Prêmio® and Azamax®. The results showed that EO of Citrus limon (L. Burm) species showed the best LC50 for the Rutaceae family and Myrtaceae family was the EO of Eugenia caryophyllus (L.) compared with deltamethrin resistant population. The binary mixtures for the resistance management P. xylostella showed 77.50% of synergic between synthetic, botanical and oil products studied. We synergic products 69.85% showed very strong synergism and larval toxicity with concentration-reduction index (CRI) of 1,281.65 times for the EO for Eucalyptus globulus (Labill.) when mixed with EO Citrus aurantiifolia (Tanakae). The mixture that promoted a 31.35 fold decrease in the LC50 of deltamethrin was with Eucalyptus citriodora (Hook). The essential oil studied are promising for the P. xylostella management and have great potential to be industrially produced due to formulations that facilitate the application on the product and can be implanted in the botanical insecticide market.