Please use this identifier to cite or link to this item:


File Description SizeFormat 
31_125-131.pdf467.87 kBAdobe PDFView/Open

Item Summary

Title: Effect of Neem Oil, Monocrotophos, and Carbosulfan on Green Leafhoppers, Nephotettix virescens (Distant) (Homoptera: Cicadellidae) and Rice Yields in Thailand
Authors: Jahn, Gary C.
Issue Date: 1992
Publisher: Hawaiian Entomological Society
Citation: Jahn GC. 1992. Effect of neem oil, monocrotophos, and carbosulfan on green leafhoppers, Nephotettix virescens (Distant) (Homoptera: Cicadellidae) and rice yields in Thailand. Proc Hawaiian Entomol Soc 31:125-131.
Abstract: Field trials were conducted in Thailand to determine the effect of Thai neem seed oil, monocrotophos (Azodrin), and carbosulfan (Posse) on rice yields (Oryza sativa L., variety RD7). Neem-treated plots did not yield significantly more rice than control plots. Plots treated with monocrotophos or carbosulfan had significantly higher yields than control plots or neem-treated plots. The rice yields were correlated with the levels of three insect species: Nephotettix virescens (Distant) (Homoptera: Cicadellidae), Nilaparvata lugens (Stal) (Homoptera: Delphacidae), and Chilo sp. (Lepidoptera: Pyralidae). Only N. virescens exceeded its economic threshold. More than 95% of the variation in yield data could be explained by the N. virescens levels 36 days after transplanting, N. virescens populations were reduced by applications of monocrotophos and carbosulfan. N. virescens was not effectively controlled by neem seed oil. N. virescens control with monocrotophos or carbosulfan at economic threshold appears to significantly increase rice yields.
Pages/Duration: 8 pages
ISSN: 0073-134X
Appears in Collections:Volume 31 – 1992 : Hawaiian Entomological Society

Items in ScholarSpace are protected by copyright, with all rights reserved, unless otherwise indicated.