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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. Meanwhile, Yancheng Hucheng from Yandu District, Yancheng City, mentioned that his family's rice has just started to tiller, and there are many brown planthoppers and rice leaf rollers in the field. They had previously tried cyhalothrin and phoxim, but it didn't work well. He asked what chemicals would be more effective for controlling both the rice leaf roller and the planthoppers. Additionally, Bao Zhaolin, a farmer at Baoying Lake in Jinhu County, called in and said that the rice is currently in the flowering stage, with a high population of rice planthoppers in the field. He asked if kumquat could be used for prevention or control.
In response, it was explained that chrysanthemum-based pesticides, such as cyhalothrin and marrifolate, belong to the pyrethroid class. The use of these pesticides in rice fields can cause rice planthoppers to move away or even lead to resurgence. Studies have shown that pyrethroid insecticides contribute significantly to the re-infestation of planthoppers for several reasons. First, standard doses often fail to kill all the pests, only eliminating part of the population temporarily, leading to short-term effectiveness. Second, pyrethroids can stimulate the reproductive activity of planthoppers, increasing egg-laying and causing their numbers to rise beyond those in untreated areas. Third, these pesticides also eliminate key natural predators like spiders and black-shouldered green-nosed locusts, allowing surviving planthoppers and their offspring to multiply unchecked.
For the control of brown planthoppers, it is 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 in the province is higher than the same period last year, indicating a large-scale infestation. In fields with high numbers of brown planthoppers, it's best to avoid pyrethroid insecticides and their combinations. Instead, quick-acting options like chlorpyrifos, isoprocarb, and propofol, along with long-acting agents such as fipronil or bufalin, are more suitable. If the field also needs to manage rice leaf rollers, it’s advisable to use products like Frigoxylate or chlorpyrifos, possibly combined with avermectin, thallone, or other compatible insecticides. This integrated approach helps ensure better pest control and reduces the risk of resistance development.