Trend Forecast of Rice Pests and Diseases

1, rice planthoppers, rice leaf roller.

It is expected that the second-generation rice planthoppers will occur in Grade 4 (medium weight), and some cities and counties in eastern Hubei, western Hubei, and northern Hubei will have Level 5 (large occurrence); the third, fourth, and fifth generations of rice planthoppers will occur throughout the province. It is expected that the second generation rice leaffolder will be moderately weighted and will occur in large areas, mainly affecting early rice. The third generation of rice will cause serious damage to the middle rice, while the fourth generation of rice will have medium and heavy partiality and will cause major damage. The main basis: (1) "Two relocations" pests move in early. On April 1st, insects were seen under the lights of Enshi City, which was the earliest year in history. On April 4th, adults of Cnaphalocrocis medinalis were observed more than a month earlier than usual. (2) The amount of insects in the field was high, and some cities and counties in the eastern Hubei and western Hubei had serious problems. In the middle and early June survey, the average amount of 100-300 head hoppers of rice planthoppers in most cities and counties across the province was comparable to that of the same period last year. There are 500-1000 heads in some cities and counties in western Hubei, northern Hubei and eastern Hubei, and there are more than 2,000 local plots, which is higher than the same period of previous years. The rice leaffolder collected moths in the middle and early June, and the average amount of mu in the eastern Hubei, Southwest Hubei, and Jianghan Plain was 30-400 heads, with an average of 12,183 heads, an increase of 22.52% over the same period of last year. The average volume was 4.1, an increase of 24.67% over the previous year. (3) The southern area is rich in insect resources. According to the recent investigations in Guangxi, Guangdong, and Yunnan Plant Protection Stations, field rice planthoppers and rice leaf roller hoppers have a high amount and heavy weight, providing more outland insect resources to our province. (4) According to the weather forecast, during the period of the Meiyu rain, concentrated rains occurred throughout the province, which would be beneficial to the relocation and damage of the “two migrations” pests.

2, II Huai.

It is expected that the second generation of the second generation of Slugs will have a level of 4, most of which will be grade 5, and southwestern Hubei and northwestern Hubei will be 2-3. The egg hatching period is in the southern rice region from July 8 to July 28; the northern rice region is from July 15 to August 5. The three generations of the second-generation stem borer occur in the Jianghan Plain, Southeast Hubei, and the east of the Yangtze River. . The main basis: (1) The generation of second generation warts is heavy and the base number is high. According to surveys conducted in the early rice area of ​​the Eastern Hubei and Jianghan Plains in late May, the average dry tip rate of a generation of S. japonicum was 17.5%, and the highest dry shoot rate was 76%, slightly lighter than in recent years. According to another survey conducted in mid-June, the northwestern Hubei Province and southwest Hubei Province were light and the base number was low. The average amount of insects per mus for two generations of rice borers in North Hubei, East Hubei and Jianghan Plains was 1891.2, which was 23.8% lower than that of last year. Some cities and counties had higher insect populations, and Xianning, Chibi, and Huangzhou all had more than 5,000. (2) The rice farming system is conducive to the occurrence of aphids. Due to the inconsistent planting period of paddy rice in our province, the growth period of rice is extremely irregular, and the number of bridge fields and insect source fields are good for the occurrence of aphid damage. At the same time, in recent years, a large number of light cultivation measures such as no-tillage and high-quality varieties have been promoted, which also benefits the The occurrence of phlegm damage. (3) The climatic conditions had no obvious adverse effects on the occurrence of rice borers.

3, Sanhuanyu.

It is expected that the second generation of three-phase phlegm will occur in Level 2 (moderately mild), and the eastern Hubei Province will be in Level 4. Three generations of the three generations of S. japonica occurred in level 2, the northern rice area in the eastern Hubei and Jianghan Plain had a grade 4 degree, and the fourth generation occurred in level 4 on late rice in eastern Hubei. Mainly based on: (1) In addition to the heavy occurrence in some areas of eastern Hubei, one generation of the province is light and the base is low. (2) The current planting structure is beneficial to it. In recent years, the area of ​​mixed planting of double-season rice and early, middle and late rice has expanded, providing good feeding and transfer conditions for Sanhuayu, which is beneficial to its occurrence.

4, middle ear rice syndrome.

It is expected that the incidence of panicle stage syndrome in the province will be grade 4 (moderately heavy), and the degree of occurrence of local high-sensitivity varieties may reach grade 5, with the western region being heavier than the eastern region. The degree of occurrence mainly depends on the weather conditions from late July to mid-August. If typhoons and rainy weather are frequent, they are likely to occur seriously. Mainly based on: The prevalence of pancreatic syndrome in the past two years is widespread and the source of bacteria is more extensive. Most of the high-quality rice has poor disease resistance. The varieties of Honglianyou Series, Youyou Series, Liangyoupeijiu and Yueyou 938 are highly sensitive to rice smut and rice smut. This year, the weather in our province is abnormal, and there are more rains and more rice and rice smut. The risk of a pandemic is very high.

5, rice sheath blight of middle and late rice.

It is expected that the occurrence of rice blast blight in the province will occur in 4-5 levels. Mainly based on: The current situation in the early and middle rice is widespread, and bacteria sources are widespread. Investigation in mid-June: The average diseased rate of rice sheath blight was 2.5%-33.3%, and the average disease rate of field plots was about 15%. The average diseased rate of middle rice was 1.5-12.3%, and the average plot was about 3%. In most areas, the amount of nitrogen fertilizer is large, and the fertilizer and water conditions are good, which is favorable for disease.

6, rice blast disease.

It is estimated that the degree of occurrence in the northern mountainous regions of Hubei Province, Hubei Province, southwestern Hubei Province, northwestern Hubei Province and Jianghan Plain, and high-quality rice production regions will be in the order of 4 and 5 respectively. Other rice areas 1-2. The main basis: (1) a wider source of bacteria. In the middle and early June of June, rice leafhoppers were found in the northern rice fields of Hubei, Hubei, Southwest Hubei and Jianghan Plain. (2) The area of ​​high-quality rice is large, and the resistance of most high-quality rice is poor. (3) The microclimate characteristics of heavy fog and mountainous conditions in mountainous areas favor the occurrence of rice blast, which can easily cause the damage of the panicle blast during heading.

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