Hainan agrochemical company develops new pesticide to protect string bean crops from thunderworms 12-22-2019

On November 22, Hainan Zhengye Zhongnong High-tech co., LTD. applied to register a new chlorfenapyr pesticide formula, which consists of 45% imidacloprid. The new pesticide will be aimed at protecting string bean crops from thunderworms. This new formula will be the first imidacloprid-based pesticide in China to be used on string beans.


String bean thunderworms are one of the leading pests for string bean crops, and these insects are also some of the most difficult to combat. Thunderworms are capable of ruining a string bean plant’s entire yield, as they damage vital anatomy in the plant’s stem. After a string bean plant is damaged by a thunderworm, its leaves may shrivel, and at worst the plant may die entirely without producing any beans. Furthermore, in high temperatures, damaged string bean plants often grow to have a withered stem, deformed leaves, and the plant may drop a large number of blossoms and pods. With serious damage, the quality of the bean pods produced by the plant is affected, and the entire yield of the plant is ruined.


Imidacloprid highly effective, but may have unintended side-effects

Imidacloprid is a highly effective nicotine-based pesticide which has the advantage of leaving behind little trace and not easily allowing insects to develop resistance. Furthermore, imidacloprid kills insects both through outer exposure and through poison by ingestion. After insects come into contact with the pesticide, their central nervous system becomes affected, which causes the insects to become paralyzed and then die. The pesticide works fairly quickly, taking effect within a single day after application. Traces of the pesticide remain on crops for about 25 days after use. The effectiveness of the pesticide is directly correlated with temperature; in higher temperatures, the pesticide is more effective. The pesticide is especially effective on insects that have piercing and sucking mouth parts.


According to reports, under certain environmental conditions, imidacloprid may have toxic effects on bean crops that are sensitive to pesticides. The electronic label of this newly formulated pesticide clearly states, “This product should be used on string bean crops during the early stages of a thunderworm outbreak. The product should be sprayed evenly on the plant, and care should be taken to avoid letting liquid from the product come into contact with other crops in order to avoid unintended crop damage. Crops on which this product is used should not be harvested or consumed until at least five days after the last use of the product, and the product should only be used once per season on each crop. Care should be taken not to spray the product on soil, and the product should not be used during rain or when rain is predicted.


Imidacloprid already used in China to protect various bean crops

According to data from the official Chinese website for information on agricultural chemicals, before the formulation of this new pesticide, three imidacloprid-based pesticide formulas had already been temporarily registered for the use on other bean crops. These products are aimed at protecting soybeans and kidney beans against aphids and liriomyza. However, at present, only Harbin Fuli Biochemical Development co., Ltd. of Heilongjiang province has officially registered an imidacloprid-based pesticide, which is an imidacloprid-based formulation containing 4% perchloric acid aimed at protecting soybeans from aphids.


For more information on China’s insecticides market, please check our China Insecticides News

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