Abstract
ABSTRACT The leafminer [Liriomyza sativae (Diptera: Agromyzidae)] is one of the main pests of melon crop (Cucumis melo) in the states of Rio Grande do Norte and Ceará. Thus, adopting strategies to control this destructive insect is essential. The aim of this study was to evaluate the effect of aqueous neem seed extract, applied to soil via irrigation, on leafminer larvae, in the melon crop. An experiment was conducted in greenhouse, in completely randomized design, consisting of five treatments (four doses of aqueous neem seed extract: 1; 3; 5 and 10 g/100 mL) and the control consisting only of distilled water and 10 replicates (melon plants). The treatments were applied in a single dose, via soil irrigation. In the first stage of the evaluation, 24 hours after application, the number of dead larvae per plant was counted. In the second step, pupal mortality was recorded. The total mortality was also calculated considering the number of larvae and the number of emerged adults. We verified that, increasing the concentration of aqueous neem seed extract, an increase in the larval and pupal mortality of the leafminer in melon crop was noticed. The concentration 10 g/100 mL presented the best results, resulting in 36.4% of larval mortality, 96.5% of pupal mortality and 96.8% of total mortality.
Highlights
Efeito de extrato aquoso de sementes de nim, via irrigação, sobre larvas de Liriomyza sativae em meloeiro
Few insecticides to control the leafminer in melon crop are registered (Agrofit, 2017), which makes the active principle rotation difficult favoring the selection of resistant populations
Increasing the dose of aqueous neem seed extract applied via soil irrigation provided an increase in larval and pupal mortality of the leafminer
Summary
Efeito de extrato aquoso de sementes de nim, via irrigação, sobre larvas de Liriomyza sativae em meloeiro. Nesse trabalho foi avaliado o efeito do extrato aquoso de sementes de nim, aplicado via irrigação no solo, sobre larvas da mosca minadora, em meloeiro. O aumento da dose do extrato aquoso de sementes de nim proporcionou aumento da mortalidade larval e pupal da mosca minadora em meloeiro. The leafminer Liriomyza sativae (Diptera: Agromyzidae) is one of the most important pests of melon crop (Cucumis melo) in the Brazilian semiarid region in states of Rio Grande do Norte (RN) and Ceará (CE) (Araujo et al, 2013), affecting the main producers and exporters of Brazilian melon (IBGE, 2017).
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