Abstract
Insecticidal activity of NK-17 was evaluated both in laboratory and in field. It was found that the toxicity of NK-17 against S. exigua was 1.93 times and 2.69 times those of hexaflumuron and chlorfluazuron respectively, and the toxicity of NK-17 against P. xylostella was 1.36 times and 1.90 times those of hexaflumuron and chlorfluazuron respectively, and the toxicity of NK-17 against M. separate was 18.24 times those of hexaflumuron in laboratory, and 5% NK-17 EC at 60 g a.i ha−1 can control S. exigua and P. xylostella with the best control efficiency of about 89% and over 88% respectively in Changsha and Tianjin in field. The insecticidal mechanism of NK-17 was explored for the first time by utilizing the fluorescence polarization method. NK-17 could bind to sulfonylurea receptor (SUR) of B. germanica with stronger affinity comparing to diflubenzuron and glibenclamide, which suggested that NK-17 may also act on the site of SUR to inhibit the chitin synthesis in insect body and the result can well explain that NK-17 exhibited stronger toxicity against B. germanica than diflubenzuron and glibenclamide in vivo.
Highlights
The abundance of insects belonging to the order of Lepidoptera, such as Mythimna separata, Plutella xylostella, Spodoptera exigua and Hyphantria cunea etc., are one type of the most damaging pests for crops and forests
We conclude that NK-17 is a very comprising insecticide candidate for controlling pests in crops, vegetables and fruits
We explored the insecticidal mechanism of NK-17 by utilizing fluorescence polarization method for the first time
Summary
The abundance of insects belonging to the order of Lepidoptera, such as Mythimna separata, Plutella xylostella, Spodoptera exigua and Hyphantria cunea etc., are one type of the most damaging pests for crops and forests. Because they may be able to cause significant damage in the process of agricultural production, a variety of insecticides were utilized to control the Lepidoptera pests since 1950s. Benzoylphenylureas have a unique mode of action coupled with a high degree of activity on target pests and low toxicity to nontarget organisms [3,4], have become a new tool for integrated pest management. In this paper we will study insecticidal activities of NK-17 in laboratory and in field to evaluate its application prospects
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