Ten points of late stage pest control in rice
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To effectively manage pests and diseases in the field, it's essential to understand the specific types of threats present and choose the right pesticides accordingly. When mixing pesticides, always verify their active ingredients, especially when dealing with panicle blast. There are two formulations of tricyclazole, and it's crucial not to confuse them, as using the wrong one can reduce effectiveness or cause harm.
Avoid increasing pesticide dosages without proper justification, as this can raise costs and risk crop damage due to phytotoxicity. Always check the compatibility of the pesticides you're using to prevent chemical reactions that could neutralize their effects. During hot and stormy weather, adding adjuvants to your spray solution can improve coverage and help resist rain wash-off, ensuring better pest control outcomes.
When applying pesticides, use a water pump for even distribution. Divide the spraying area according to the field size, mark the spray volume on the container, and ensure the suction nozzle is clear of debris. For 1.6-liter mist sprayers, make sure there are enough workers—typically 6 to 7 people working from north to south. A single barrel of water should cover about 1 to 1.3 acres. Before starting, you can close the nozzle and spray into the air first or pre-fill the tank. Once the barrel is empty, immediately stop spraying to avoid high-concentration liquid causing damage to young seedlings.
Timing is key when applying pesticides. Avoid spraying during rice flowering (before 9 AM and after 3 PM) to prevent pollen abortion. Apply phosphorus-based or light-sensitive pesticides on cloudy days or after 3 PM. If using defoliants to control planthoppers in late growth stages, spraying at midday can enhance effectiveness.
For panicle blast and rice leaf rollers, aim the nozzle upward so the fine droplets can settle on the panicles or leaves. Fog machines work well for these pests. For planthoppers or sheath blight, focus the spray on the lower parts of the plant to reach the base, improving both prevention and leaf protection. This method typically requires a large water pump for adequate coverage.
When controlling planthoppers or older rice leafhopper larvae, maintain a water layer in the field for 3–5 days to allow the pesticide to spread between plants. For sheath blight, blast, smut, or early nymphs, pay attention to the water level. For late-stage fumigation of rice plant flies, keep the field dry for better results.
Never use banned pesticides like methamidophos or other restricted chemicals such as 1605. Follow the recommended formula strictly when managing rice quality. Avoid long-lasting insecticides like buprofezin, pymetrozine, and profenofos. Do not apply any medication within a month of harvest.
Regularly inspect fields after pesticide application to assess effectiveness. Identify areas with poor control and apply additional treatments to prevent pest outbreaks. Keep the field clean by promptly removing waste and debris, and protect aquatic life such as fish and shrimp from pesticide exposure.
Finally, prioritize safety. Work during cooler morning and evening hours, avoid alcohol before and after pesticide use, and wear protective gear like raincoats, pants, and caps. Avoid eating fruits or drinking while spraying, and minimize smoking during application.