Early rice pests or diseases will occur more heavily

    Recently, the reporter learned from the National Agricultural Technology Center's Pest and Disease Forecasting Office that based on the current analysis of the current pest and disease occurrence base and rice planting conditions, it is expected that the early rice pests and diseases will be biased in this year, with an area of 310 million mu. Among them, the insect pests are mainly rice planthopper, rice leaf roller and rice stem borer, with an area of 220 million mu; the disease is dominated by rice blast, rice sheath blight and rice virus disease, with an area of 90 million mu.

    According to reports, this year, the rice planthoppers in the middle and north of South China, the south of the Yangtze River, the middle of the Yangtze River, the beginning of the light period is 5 to 15 days earlier than the previous year, the total amount of transplanted insects is lower than the same period of the previous year, higher than the perennial year, of which in early April before moving into insects were higher than the previous year high, wide range of bias; since late April, moved to the amount of insects, immigration peak times lower than the same period last year. The density of insects in the rice fields in southern and southwestern China is higher than that in the same period of the previous year. The average number of worms is 500-800 , 1500-2500 , and the local insect population is higher in Hainan. Piece. As early as the middle of the South China plug plots population density is generally 100 to 500 / one hundred plexus, high 900 to 1500, lower than the same period last year, similar to the same period the year. The initial stage of rice leaf roller in southern China and Jiangnan rice area was 2~5 days earlier than that of the previous year. The amount of transplanted insects was equivalent to that of the same period of last year. The peak amount of peaks in the middle part of South China was higher than that of the same period of last year. The amount of moth is generally 130~460 , and the highest part of the coastal area is 22,000 . As the rice from the source of the insects gradually matures and harvests, a large number of insect sources will migrate into the country, and will continue to multiply in combination with local insect sources, and the situation will still be biased in the later stage. The occurrence period of rice stem borer in the middle reaches of South China, Jiangnan and Yangtze River is generally 3~7 days earlier than that of the previous year. The amount of larvae in the field is much higher than that of the same period of last year. The weighted average live weight of the winter in the middle of the Yangtze River and the middle reaches of the Yangtze River. The number of insects is generally 2000~4000 , and the number of insect sources is above the degree of occurrence. Rice blast and sheath blight have begun to develop in southern China, Jiangnan, and southwestern southern rice areas. The field has sufficient bacterial sources and has a bacterial source basis for disease prevalence. Southern rice black-streaked dwarf disease has been seen in Hainan, Guangdong and other places. The current area is higher than that of the same period of last year. After detection, the suspected diseased plant and the drug-transmitting mediator, the white-backed planthopper, have a high rate of virus and have a virus. The popular source of poison.

    At present, there is no fundamental change in the pattern of rice cultivars with large stalks, high-quality and high-yield varieties in China. Under the conditions of high water and fertilizer cultivation, the growth is large and the fields are sullen, which is easy to form a moderate and high-humidity field microclimate. Most rice varieties have low disease resistance and insect resistance, which is conducive to the occurrence and prevalence of pests such as rice planthopper, rice blast and dwarf disease. At present, early rice in southwestern China is at the booting stage, and early rice in the middle of southern China, Jiangnan and the middle reaches of the Yangtze River is at the early stage. Transplanting to the tillering stage, which provides suitable food conditions for the occurrence of the next stage of rice planthoppers and rice leaf roller.

 

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    Rice pests: It is expected that rice planthoppers will occur in southern China, south of the Yangtze River and southwestern south China, and occur locally. It occurs in the middle and lower reaches of the Yangtze River, with an area of 88 million mu. The rice leaf roller is found in most of southern China and Jiangnan. And the middle reaches of the Yangtze River have occurred moderately, with partial weighting occurring, with an area of 67 million mu; the occurrence of Chilo in the middle reaches of the Yangtze River, and the southern part of the Yangtze River and parts of northern China occur in an area of 49 million mu; In the South China rice region, it occurs lightly and occurs locally, with an area of 9 million mu. The other pests such as Datun have occurred to some extent in some rice areas, with an area of 20 million mu.

Rice diseases: Rice sheath blight is occurring in the middle and lower reaches of South China, Jiangnan and the middle and lower reaches of the Yangtze River, with an incidence of 65 million mu. Rice blast occurs in southern China, Jiangnan and Southwest China, and some susceptible varieties are more likely to be popular. The disease area is 15 million mu; the southern rice black-streaked dwarf disease still has a serious threat in southern China, Jiangnan and southwestern rice areas; other diseases such as rice bacterial blight and rice seedling disease have some degree in some rice areas. Occurred, the area of 9 million mu occurred .