What pesticide should be used to control the small brown planthopper at the rice heading stage?
What pesticide should be used to spray for the small brown planthopper at the rice heading stage? Please note that for the small brown planthopper at the rice heading stage, the following pesticides can be used for reference: the small brown planthopper not only transmits the virus and causes viral diseases such as rice stripe virus disease, but also concentrates on the panicles to cause damage during the heading stage of late rice. The experiment set up per mu with 40% chlorpyrifos emulsifiable concentrate 100 ml, 10% nitenpyram aqueous solution 3...
What pesticide should be used to spray for the small brown planthopper at the rice heading stage? Please note
For the small brown planthopper at the rice heading stage, the following pesticides can be used for reference:
The small brown planthopper not only transmits the virus and causes viral diseases such as rice stripe virus disease, but also concentrates on the panicles to cause damage during the heading stage of late rice.
The experiment set up a total of 6 treatments per mu: 40% chlorpyrifos emulsifiable concentrate 100 ml, 10% nitenpyram aqueous solution 30 ml, 10% imidaclothiz wettable powder 30 g, 25% pymetrozine wettable powder 20 g, 25% buprofezin wettable powder 75 g, and a clear water control. When the rice was at the grain-filling stage, a manual sprayer was used to spray at a water volume of 50 kg per mu. At the time of application, the generation overlap of the small brown planthopper was relatively obvious, with young nymphs accounting for 58.3%.
The test results showed that chlorpyrifos and pymetrozine had ideal control effects on the small brown planthopper on the panicles; the former had good rapid action, and the latter had better persistence; nitenpyram had the next best control effect, while imidaclothiz and buprofezin had poor control effects on the small brown planthopper on the panicles. A single application of pymetrozine could effectively control the damage of the small brown planthopper at the heading stage, while chlorpyrifos required one additional application.
According to monitoring, the high temperatures in July-August had an inhibitory effect on the small brown planthopper, and after the weather turned cool in September, its reproduction accelerated. The suitable period for controlling the small brown planthopper at the heading stage is about 7 days after heading (mid-to-late September). In production, it is recommended to alternate pymetrozine with chlorpyrifos, dichlorvos, and others to delay the development of pesticide resistance; in years when the small brown planthopper outbreaks, chlorpyrifos or dichlorvos can be mixed with pymetrozine to enhance rapid action and persistence. For controlling the small brown planthopper at the heading stage of late rice with 25% pymetrozine wettable powder, use 20 g of the pesticide per mu, add 50 kg of water, and spray.
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