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Rice black tailed leafhopper is a common pest, which is distributed in many areas.
Harmful symptoms:
Both adults and nymphs suck the rice plant juice with needle like mouthparts, and the harm presents many brown spots. In serious cases, the plant turns yellow or dies.
Occurrence regularity:
It mainly overwinters with nymphs and a small amount of adults on weeds in winter fallow field, green fertilizer field and field edge. The main food is mainiang. The occurrence in the Yangtze River Basin is large from mid July to late August, mainly in the late growth stage of early rice, grain filling stage of middle rice, tillering stage of single late rice, continuous late seedling field and tillering stage.
Prevention methods:
1. Planting resistant varieties; Reform the farming system according to local conditions, try to avoid mixed planting and reduce bridge field; Strengthen fertilizer and water management, improve the robustness of rice seedlings, and prevent rice seedlings from growing greedily. Pay attention to the protection and utilization of natural enemy insects and predatory spiders.
2. At the booting and heading stage of early rice (mid and late June), there are 300-500 insects per 100 clusters; When there are 300-500 insects per hundred clumps in the edge of the field and 100-200 insects per hundred clumps in the center of the field, prevention and control must be carried out.
In the early stage of continuous cropping of late rice in areas where virus diseases are prevalent, although the above control indicators are not met, timely control should also be considered. Timely spray the following agents: 90% trichlorfon crystal, 80% dichlorvos EC and 50% phoxim EC.
Harmful symptoms:
Both adults and nymphs suck the rice plant juice with needle like mouthparts, and the harm presents many brown spots. In serious cases, the plant turns yellow or dies.
Occurrence regularity:
It mainly overwinters with nymphs and a small amount of adults on weeds in winter fallow field, green fertilizer field and field edge. The main food is mainiang. The occurrence in the Yangtze River Basin is large from mid July to late August, mainly in the late growth stage of early rice, grain filling stage of middle rice, tillering stage of single late rice, continuous late seedling field and tillering stage.
Prevention methods:
1. Planting resistant varieties; Reform the farming system according to local conditions, try to avoid mixed planting and reduce bridge field; Strengthen fertilizer and water management, improve the robustness of rice seedlings, and prevent rice seedlings from growing greedily. Pay attention to the protection and utilization of natural enemy insects and predatory spiders.
2. At the booting and heading stage of early rice (mid and late June), there are 300-500 insects per 100 clusters; When there are 300-500 insects per hundred clumps in the edge of the field and 100-200 insects per hundred clumps in the center of the field, prevention and control must be carried out.
In the early stage of continuous cropping of late rice in areas where virus diseases are prevalent, although the above control indicators are not met, timely control should also be considered. Timely spray the following agents: 90% trichlorfon crystal, 80% dichlorvos EC and 50% phoxim EC.
