Randomized block trial demonstrates that neem insecticide controls leafminers without harming natural parasitoids in greenhouse string beans, highlighting viable integrated pest management options.
The string bean (Phaseolus vulgaris L.) is Sul. Liriomyza huidobrensis (Dip.: Agromyzidae) is one of the most important insect pests occurring in this culture. This research was conducted to evaluate the effect of aqueous extracts of plants and the commercial product DalNeem on L. huidobrensis and its parasitoids, as well as to analyse the population fluctuation of L. huidobrensis and parasitoids of this insect pest. The experiment was carried out on string beans cultivated in a greenhouse, where in each of the four central lines of culture, five plots were established with five plants per plot. The experimental design was random blocks with four replications. DalNeem was the treatment that best controlled L. huidobrensis. On the other hand, the treatments did not affect the parasitoids Chrysocharis bedius (Hym.: Eulophidae) or Opius sp. (Hym.: Braconidae). In plants without the use of these treatments, the population of L. huidobrensis exhibited a sharp decline with the increase of the parasitoids C. bedius, Opius sp., Eucoilinae (Hym.: Figitidae) and Diptera.
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Dequech et al. (2010) studied this question.
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