Analysis of Time‐ and Concentration‐Mortality Relationship of Nitenpyram Against Different Larval Stages of Nilaparvata lugens (Hemiptera: Delphacidae)
Authors: Zhang, Jie; Liu, Jie; Qin, Xiao-Wa; Yuan, Feng-Hui; Zhang, Run-Jie
Source: Journal of Economic Entomology, Volume 103, Number 5, October 2010 , pp. 1665-1669(5)
Publisher: Entomological Society of America
Abstract:Bioassay of nitenpyram was conducted on the planthopper Nilaparvata lugens (Stål) (Hemiptera: Delphacidae) in the laboratory by using the rice-stem dipping method. The resulting data were analyzed using the complementary log-log time‐concentration‐mortality modeling technique, yielding the parameters for time and concentration effects of nitenpyram against N. lugens instars. The LC50 values to instars I and II estimated for 24, 48, and 72 h after treatment were 1.03, 0.27, and 0.11 mg/liter, respectively. These values were lower than those for instars III and IV and instars V at the same times. The estimates of LT50 for instars I and II were decreased from 69.06 to 16.22 h with the increasing concentration from 0.125 to 2 mg/liter; the same estimates for both instars III and IV and instars V at the concentrations of 1‐2 mg/liter were close to each other, ranging from 33.11 to 44.16 h, much higher than the values of instars I and II at the same concentration. Based on the time‐concentration‐mortality relationships fitted and the virulence indices (LC50 and LT50) estimated, nitenpyram is a promising pesticide for N. lugens control.
Document Type: Research Article
Publication date: October 1, 2010
- Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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