Rice planthopper belongs to the family Homoptera, which is mainly harmful to rice. The main hazards of rice are brown planthopper, whitebacked planthopper and gray planthopper. The most harmful ones are brown planthopper and white-backed planthopper. The early rice is dominated by white-backed planthopper, and the later stage is dominated by brown planthopper. The middle and late rice is dominated by brown planthopper. Laodelphax sinensis is rarely directly affected, but it can spread viruses from crops such as rice, wheat and corn.
North Korea, the South Asian subcontinent and Southeast Asia are also seen as well as in Japan. The brown planthoppers are distributed in various rice areas in northern China; the provinces (autonomous regions) south of the Yangtze River Basin are more intense. The distribution of white-backed planthoppers is roughly the same, with more occurrences in the Yangtze River basin. These two species are also distributed in Japan, North Korea, the South Asian subcontinent and Southeast Asia. The gray planthoppers occur in North China, East China and Central China, and are also found in Japan and North Korea. Three kinds of rice planthoppers all like to feed and breed on rice. Brown planthopper can occur on wild rice and is considered to be a specialized pest. In addition to rice, white-backed planthoppers and grey planthoppers also feed on other crops such as wheat, sorghum and corn.
Make full use of domestic and foreign rice variety resistance genes, cultivate multi-resistance varieties, and promote planting according to local conditions. Rational layout of different varieties or crops to avoid the damage of rice planthoppers. At the same time, it is necessary to strengthen the management of fertilizer and water, timely and appropriate fertilization and timely exposure of the field to avoid long-term flooding. These are useful ways for prevent paddy from damage of planthopper, but when the situation is serious, we should consider the insecticides controlling way.
Pymetrozine 25%WP is a pyridine or triazinone insecticide. It is a brand new non-biocidal insecticide. It was first developed by Ciba Cargill in 1988. It is a sucking device for a variety of crops. The pests show excellent control effects.Pymetrozine 25%WP has a contact effect on pests and also has systemic activity. It can be transported both in the xylem and in the phloem in plants; therefore it can be used both as a foliar spray or as a soil treatment. Due to its good transport properties, newly grown leaves and old leaves can be effectively protected after spraying on stems or leaves.
25%WP Pymetrozine 25%WP has strong contact and systemic action, unique mechanism , less liable to resist.
Can be used on controlling rice planthoppers and aphids of ornamental chrysanthemums. When pests contact the pesticide liquid, the mouthpart would immediately be obstructed and show a strong inhibition of feeding. It is an irreversible physical action that can promptly stop the pests from eating and damage the crops without causing resistance.
No interaction with other pesticides, high internal conductivity, environmental friendly, safety for natural enemies, long effective period, 25-30 days.
The product of Nongxin has 10g and 200g two different small packages, is very convenient for planthopper control.