There are two sources of insects in the field of rice planthoppers, that is, the breeding and breeding of the local planthoppers in the previous generation and the landing of the flying locusts in the migration, so the measurement and reporting should be accurate and timely in the prevention and control work, and the drug selection should be long-term. Suction pesticides are applied in combination with quick-acting fumigation and contact pesticides. The specific methods are as follows:
1. Fields with a dose of 1000-2000 worms should be used in the young nymphal stage (below 3 years old) 667 square meters with 25% chlorpyrifos (thiazinone) WP 45-50 grams or 10% Imidacloprid wettable powder 15~20g is evenly sprayed with 50kg of water. This medicine can control and eliminate the locust by the contact and systemic action (suppressing the young locust), and the duration can reach more than 20 days.
2. In the field of 2,000 to 5,000 heads of worms, 50% dichlorvos EC should be added at the same time as spraying “Binglingling†or “Imidaclopridâ€, and the concentration should be 400-500 times. Highly easy to burn seedlings, can quickly control the amount of insects within 2000 heads.
3. For plots with more than 5,000 worms, it is necessary to quickly organize labor to control by fumigation of toxic soil, otherwise the rice can be topped and fallen in a short time. The method is: drain the field water, mix 667 square meters with 50% dichlorvos EC 250-300 grams and 25-30 kg wet sand, mix for 3 to 5 hours, evenly spread after the dew is dry, 4 pm At the end of the previous period, more than 90% of the amount of insects in the field can be killed after 1 hour of application, and then the above spray method is used for prevention and treatment.
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