Abstract

NAVARRETE, Bernardo; VALAREZO, Oswaldo; CANARTE, Ernesto  and  SOLORZANO, Ramón. NEEM (Azadirachta indica JUSS.) EFFECT ON Bemisia tabaci GENNADIUS (HEMIPTERA: ALEYRODIDAE) AND ITS BIOLOGICAL CONTROLLERS IN MELON CROP Cucumis melo L.. La Granja [online]. 2017, vol.25, n.1, pp.33-44. ISSN 1390-8596.  https://doi.org/10.17163/lgr.n25.2017.03.

This research was carried out in Lodana, Santa Ana, Manabí from October to December of 2005, in order to determine the effect of neem compounds on the populations of Bemisia tabaci and their biological controllers in melon crop. It used a completely randomized block design whit a group arrangement with four repetitions. The treatments had aqueous extract from neem seeds in dosages of 25, 50, 75 and 100 g L−1 and formulated oil of neem seeds (INBIO- 75) in dosages of 2,50; 5,00; 7,50 and 10,00 mL L−1; besides a chemical witness (Imidacloprid 1 mL L−1) and an absolute witness (applications of water) were included. Both the aqueous extract and the formulated oil, reduced the populations of eggs, nymphs and adults of B. tabaci, being the aqueous extract in dosage of 100 g L−1 the most effective treatment, although it was overcome by the chemical witness in the nymphs and adults control. With regard to the effect on the natural enemies, the neem compounds did not have influence on the predatory populations, in the case of parasitoids, their population was minor in the plots with neem. The chemical witness was the treatment that obtained the best result however the treatments with neem had superior yields than the witness treatment. The results of the test carried out in greenhouse, suggest the dissuasive effect of neem compounds on the oviposition of B. tabaci.

Keywords : botanical insecticides; cucurbits; biological control; whiteflies.

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