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Controlling rice planthoppers with other pyrethroid pesticides
Yang Chengyu from Jiangba Township, Hongze County called in and reported that the rice planthoppers in his fields are in a severe condition. He asked whether chlorpyrifos and Wick (which contains 29% phoxim and 1% lambda-cyhalothrin) can be used for control. Similarly, Yancheng Hucheng from Yandu District, Yancheng City, mentioned that his family's rice has just started to panicle, but there are many brown planthoppers and rice leaf rollers in the field. They have tried cyhalothrin and phoxim several times, but it hasn’t been effective. He is now asking what chemicals should be used to effectively manage both rice leaf rollers and planthoppers.
Additionally, Bao Zhaolin, a farmer at Baoying Lake in Jinhu County, contacted us and said that the rice is currently in the flowering stage, with a large number of planthoppers in the field. He asked if kumquat could be used as a natural method for prevention or control.
In response to these concerns, it’s important to note that chrysanthemum-based pesticides, such as cyhalothrin and marrifolate, belong to the pyrethroid class of insecticides. Their use in rice fields can actually cause rice planthoppers to become more active and even lead to resurgence. Studies have shown that the main reasons for this rebound include:
First, standard doses of pyrethroid insecticides often fail to kill all the planthoppers. They may only eliminate part of the population, and their effect is short-lived, making long-term control difficult. Second, these insecticides can stimulate the reproductive activity of planthoppers, leading to increased egg-laying and higher population growth. Third, they tend to kill off the natural predators of planthoppers, such as spiders and black-shouldered green-nosed locusts, which results in unchecked population growth after application.
Therefore, when managing brown planthoppers, it’s recommended to combine long-acting and fast-acting insecticides. According to the latest report from the Jiangsu Provincial Department of Agriculture and Forestry Plant Protection Station, the current population of brown planthoppers is significantly higher than the same period last year, indicating a widespread infestation. For fields with high numbers of planthoppers, it's best to avoid pyrethroids and their combinations. Instead, use quick-acting agents like chlorpyrifos, isoprocarb, or propoxur, along with long-acting options like fipronil or bufalin.
If the field also needs to control rice leaf rollers, it would be better to use insecticides such as fenpropathrin or chlorpyrifos, or add avermectin, thallone, or other compatible compounds to enhance effectiveness. Always follow local agricultural guidelines and consider environmental impact when selecting pesticides.