What are the control methods for rice stem borers?
What methods are there to control rice stem borers? Please provide an introduction. The following methods can be used to control rice stem borers: 1. Eliminate overwintering insect sources: Through plowing for planting or shallow rotary tillage to remove stubble, reduce the amount of residual rice stubble, clean up rice straw, and remove wild rice stems and weeds along field edges and ditches, to reduce insect sources, destroy the overwintering sites of stem borers, and lower their overwintering survival rate.
What methods are there to control rice stem borers? Please provide an introduction.
The following methods can be used to control rice stem borers:
1. Eliminate overwintering insect sources: Through plowing for planting or shallow rotary tillage to remove stubble, reduce the amount of residual rice stubble, clean up rice straw, and remove wild rice stems and weeds along field edges and ditches, to reduce insect sources, destroy the overwintering sites of stem borers, and lower their overwintering survival rate.
2. Update rice varieties: Reduce or eliminate the few varieties that are particularly susceptible to the pest, to reduce the pressure of chemical control and the base population.
3. Fertilized dry seedbed: Compared with water-raised seedlings, fertilized dry-raised seedling beds have lower egg deposition by the striped stem borer, and field damage is lighter.
4. Flooding to kill pupae: Because newly hatched striped stem borer larvae damage rice leaf sheaths, for late-maturing winter crop fields and milk vetch seed fields, flooding with 3.5-6.5 cm of water during the pupation period can drown most of the pupae. Alternatively, during the mature larval stage of the first and second generations, drain the field water to let the larvae bore into the root zone to pupate, then flood with deep water for 3 days during the pupation period, which can drown most of the pupae, with a control effect of over 90%.
5. Appropriate delayed sowing, cultivation to avoid borers: Comprehensively promote light cultivation techniques for rice, which can appropriately delay the rice sowing period, so that the rice seedling stage, which is prone to egg deposition, avoids the peak egg-laying period of the first-generation stem borer, reducing egg deposition in seedling beds, reducing the occurrence of the first-generation stem borer and the annual base population, achieving the goal of cultivation to avoid borers.
6. Chemical control: 1) Adhere to the control strategy of "vigorously controlling the first generation, generally controlling the second generation." The first generation aims to reduce the base population, with concentrated control in seedling beds, showing obvious control effects. The second generation aims to control damage, protect yield and secure a bumper harvest. 2) Grasp the pest situation and ensure pesticide application at the peak of egg hatching. 3) Select the right pesticide to ensure control effects. Chemical control should select pesticides according to different regions and different generations, minimize the number and amount of pesticide applications, rotate pesticides to slow down resistance, and choose low-toxicity and biological pesticides. 4) Apply pesticides correctly to maximize efficacy. For controlling the second-generation striped stem borer, broad flooding application and coarse spraying are superior to fine spraying and mist spraying, and pesticide application should be timed during the dead sheath stage.
During the peak egg hatching period, promptly spray fields with more than 50 egg masses per mu. To prevent dead hearts and dead sheaths, apply pesticides during the larval stage (peak egg hatching period); to prevent white heads, apply pesticides at the early stage of rice panicle emergence (about 10% panicle emergence). When pest populations are large, a second application is needed 5-7 days after the first. Applicable pesticides: 40-50 ml of 5% fipronil suspension concentrate per mu; or 50-60 ml of 48% chlorpyrifos, for controlling the first and second generations of the yellow stem borer and the first generation of the striped stem borer, with broad-spectrum and long-lasting effects, and can also control small brown planthoppers and rice weevils; the biological pesticide Suteling, applied before the peak of egg hatching and young larval stages; 50 g of 51% Daonong No. 1 per mu, or 60 g of 46% Tesha Ming, diluted with 37.5 kg of water for spraying.
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