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Bioactivity of Neem, Azadirachta indica, Against Spittlebug Mahanarva fimbriolata (Hemiptera: Cercopidae) on Sugarcane

Author:
Garcia, J.F., Grisoto, E., Vendramim, J.D., Botelho, P.S.M.
Source:
Journal of economic entomology 2006 v.99 no.6 pp. 2010-2014
ISSN:
0022-0493
Subject:
Cercopidae, Azadirachta indica, neem seed extract, bioactive properties, toxicity, lethal dose 50, longevity, fecundity, Saccharum officinarum, sugarcane, botanical insecticides, insect control
Abstract:
The effect of neem, Azadirachta indica A. Juss, on some biological parameters of Mahanarva fimbriolata (Stål) (Hemiptera: Cercopidae) was studied in the laboratory by using NeemAzal-T/S, Nimkol-LS, and an aqueous neem seed extract. Initially, the LC50 was estimated for nymphs. Later, nymphs fed on sugarcane, Saccharum officinarum L., roots were sprayed with the respective LC50 for each product. The adults were maintained in cages on sugarcane plants sprayed at the base with the maximum rate recommended commercially for the crop (3 liter/ha). Moistened cotton discs surrounding the base of the plant were used as oviposition substrates. The LC50 values estimated for NeemAzal, Nimkol, and aqueous extract were 0.014, 0.225, and 0.611%, respectively. There was a reduction in spittlebug longevity, regardless of sex, in relation to the control. Males exposed to the neem products, and aqueous extract showed longevity reductions of approximately equal to 50%, whereas for females the reductions were 55-60%. The neem products and extract reduced fecundity by 75-85%. Morphological and physiological changes were observed in 9% of the eggs from individuals submitted to NeemAzal. Neem-based products, especially NeemAzal, have potential for the control of M. fimbriolata.
Agid:
715527