The reporter learned from the Provincial Plant Protection Station that black-streaked dwarf disease will occur moderately in single-season japonica rice growing along the river, along Huai River, and in some parts of the Jianghuai and Huaihe River. Rice stripe disease is located in the Jianghuai, part of the river along the river, and the southeastern part of the rice paddy. Early rice, single-season japonica rice and japonica rice in Jianghuai, part of the rice area along the Huaihe River will occur less frequently. The province is expected to have an area of ​​about 3 million mu and 1 million mu, respectively.
According to field surveys around the country, it is expected that most of the adult population of S. macrophylla will appear in the late May to late June, which is similar to the normal year. The specific prevention and control strategies are: to do a good job of prevention and control at the field stage, to cure sedges, to stop the spread of poisonous sources, and to stick to the technical policy of “resolving fields, protecting fields, pest control, and pre-controlâ€. In the severe ward area, rice is delayed and sowing dates are recommended, live broadcasts are encouraged, the generation of migratory locusts is avoided, and the use of insect-repellent nets or non-woven fabrics for breeding is promoted. During the ripening period of wheat harvest, it is commonly used to control Scutellaria barbata in the field, and 6 grams of pymetrozine is used as an effective ingredient. Disease areas often occur in the second generation of hatchlings hatching nymphs to the young nymphs at the height of the prevention and treatment, mu active ingredient pymetrozine 6 g or nitenpyram 2-3 g.
The chemical control indicators are: When there are 10 to 20 poisonous insects per square meter in Putian, there are 15 to 30 poisonous insects in each field of Datian. Variety susceptibility, the indicator takes the lower limit; the cultivar is more resistant to disease, the indicator takes the upper limit. Dachengcheng and nymphs coexist, and the proportion of adults is high, and the indicators are strictly controlled.
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