Rice stripe disease is a rice virus disease transmitted by SBPH. It is difficult to prevent and control rice once it becomes ill. Only when it is pulled out, it is called “cancer†by rice farmers and has a great impact on rice production. Now the growth of rice in Qilin District has entered its peak period. According to the forecast of the Crop Protection Department, sporadic stripe leaf blight has emerged. If the prevention and control measures are not in place, rice stripe disease will be endemic, causing huge losses to rice production. . In order to effectively control the spread rate and the degree of harm of rice stripe disease in our region, rice stripe disease must be effectively controlled to ensure the safety of rice production in our region.
First, the symptoms
At the seedling stage, the chlorotic yellow and white spots appear at the base of the leaf, and then it expands into yellow stripes parallel to the veins, and remains green between the stripes. Yellow, white, soft, curly drooping heart, into a "false dead heart." At the end of delivery, chlorotic macular lesions appear at the base of the next leaf of the heart, followed by the formation of irregular yellow-white streaks, and the old leaves are not significantly affected. After onset of jointing, yellow-green stripes appeared on the lower part of the flag leaf, not dry, but heading malformation was rarely found, resulting in the formation of a false white spike.
Second, prevention and control measures
Prevention and control of rice stripe disease should adhere to the "prevention-based, comprehensive prevention and control" plant protection policy, coordination and use of agricultural, physical, chemical and other technical measures to effectively control the rice stripe disease epidemic.
1. Based on local conditions, rational application of disease-resistant varieties, adherence to high-quality, high-yield, multi-(high) antigens, selection of varieties with excellent quality, high yield, and comprehensive resistance. For example, No. 29 Yunxiao, No. 23 Yunxiao, and No. 27 Chuxi.
2. Focus on seedling cultivation, nurture strong Zha field to focus on contiguous areas, reduce the rate of seedlings being sucked and transmitted by Smilax crickets, and at the same time facilitate the management of fertilizers and waters and the prevention and control of Sphaerocephalus and improve the control effect. Scientific fertilization, appropriate control of the amount of nitrogen fertilizer, cultivation of old Jian Jian seedlings, enhance plant resistance and disease resistance.
3. The removal of weeds, the cleaning of pastoral farmland weeds and the "four sides" (Tianbian, Ditchside, Roadside, Ditchside) weeds are important breeding grounds for SBPH. It is necessary to increase the control of weeds in paddy fields and fields around rice fields in order to aggravate the living environment of Laodelphax striatellus, reduce the number of transitional hosts, cut off the host chain, and reduce the incidence. For diseased rice fields, the diseased seedlings should be removed as soon as possible, which can reduce the source of poison in the fields and prevent the disease from further aggravating, and can also promote the development of strains and give up space and nutrients.
4. Grasping chemical control chemical prevention and control of Laodelphax striatellus at an appropriate time is one of the important measures to effectively control the amount of Laodelphax striatellus and prevent transmission of poison. (1) Focus on the prevention and control of Laodelphax striatellus during seedling stage. The prevention and control of the adults of Slugs in the Putian period is the key to controlling the occurrence of early-stage stripe disease, and it can also reduce the pressure of field control. Usually about 15 days after the film is removed, it is the peak of the nymph larvae of the first generation. It can use 40-50 ml of 5% Rhizome suspension agent or 40-45 kg of water of 25% imidacloprid per acre.
(2) Timely control of hazards during delivery. During the peak of Daejeon’s tillering (peak of the second generation of L. striata young nymphs) and the peak of the third-generation L. striata young nymph, use 25% imidacloprid 20-30 g per mu, or 70% of Amiele 5-6 g, watering 40 - 45 kg spray.
(3), 7-10 days before rice heading, combined with rice smut, rice blast, 25% imidacloprid 20-30 grams per acre to control the head of the ear.
In chemical control, we should pay attention to the safety of pesticides and their alternate use. The pesticides of the same type should not exceed 2 times in the entire growth period of rice; the dose of mu should not exceed 200 ml; Ruijinte should be highly toxic to bees, shrimps and crabs, and use safety.
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