What are the control methods for rice stem borers?

Netizen Yeshan Judicial Office sent an email on July 4: I am a staff member of the town agricultural technology station. Right now we have too many rice stem borers here, and they are hard to control! I had farmers use Dakuangsha and dimethoate, but the feedback was that the control effect on stem borers was poor. May I ask what methods should be used to control rice stem borers?

Answer: The three rice borers, the Asiatic rice borer (Chilo suppressalis), the yellow stem borer (Scirpophaga incertulas), and the pink stem borer (Sesamia inferens), are all commonly known as stem borers. To control rice borers, insecticides should be applied before the larvae bore into the rice plants, generally at the peak hatching period of the eggs; applying insecticide after the larvae have bored into the rice plants is often ineffective.

At present, most of the deadheart damage in rice is caused by the Asiatic rice borer, which has the habit of moving between plants to cause damage; a single larva can cause deadheart in multiple tillers.

To control the Asiatic rice borer, apply insecticide at the peak hatching period of the eggs. Commonly used insecticides such as chlorpyrifos, abamectin and their mixtures with monosultap give good control. Applying diazinon, butene-fipronil (the similar fipronil is one of the most effective insecticides for controlling the Asiatic rice borer), chlorantraniliprole, flubendiamide, metaflumizone and other insecticides also gives good control. Among them, diazinon, butene-fipronil, chlorantraniliprole and flubendiamide have good systemic translocation, so when the optimal control period has been missed and the Asiatic rice borer has already bored into rice leaf sheaths and other parts, applying them still gives good control and can effectively reduce the damage from the Asiatic rice borer moving between plants.