Rice planthopper is a kind of migratory pest, which has the characteristics of long distance migration and cluster damage rice fields. In recent years, the frequency and the damage caused by rice planthoppers in late rice have been particularly prominent and have become one of the major pests of late rice. Timely prevention of rice planthoppers is the key to seizing the late rice harvest. Late rice planthoppers generally have 1-3 peak periods. The first peak period occurred in the booting and heading stage of rice, from late September to early October (the main source of insects is from the northern rice region with the cold air from the north to enter the breeding stage in mid-September); the second peak appears. In the panicle to the milk ripening period, that is, in the middle and late October; the third peak period appears in the wax ripening period, that is, in mid-November. The first peak period was dominated by the whitebacked planthopper population, while the remaining two peak seasons were dominated by the brown planthopper population. Due to the impact of the weather conditions, the local environment temperature, and natural enemies and cultivars, the peak period and degree of damage caused by the incoming rice planthoppers are different. In some years, the peak periods are not obvious, and the degree of damage is light; however, some years may have 2-3 peaks in a row, with a large amount of occurrence and a wide area of â€‹â€‹damage. In late rice, the damage caused by rice planthoppers from heading to full heading is the heaviest, which can lead to loss of grain; the milk wax is the second most common victim, and the general loss is about 60%; the waxing period is relatively light, but â€œwearing the topâ€. Still can lose 20-30%. According to the survey, hybrid rice was topped 7 days before harvest and the yield loss was 26.6%. The degree of damage varies depending on the variety and ripening period. Generally early-maturing and dwarf varieties occur early, and the damage is heavier. Late-maturity, high-stalk and heterotic varieties are relatively late, and the damage is lighter. In terms of prevention and control indicators, if the density of insect population per 100 families, the booting to heading period reached 500, heading to the milk waxing period of 800-1500 head, wax maturity of 3,000 or more, are required to control the application of pesticides. According to the local insect forecast, it is necessary to control the nymph during the peak period, dry after morning dew on sunny days, or in the afternoon and evening. Spraying with 90% crystal trichlorfon 800-1000 times, can also treat rice planthoppers, armyworm, stinkbugs, rice leaffolders and so on. Can also be used 20% foliar spray emulsion 800-1000 times spray. Can also be used 10% Sterling 3000-3500 times spray. Or spray with imidacloprid (puchi) 2500-3000 times. Before the application of pesticides, the field should be filled with a thin layer of water. The effect of prevention and control is significant.
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