Today's summer solstice marks the arrival of the mid-summer season, and it is also Father's Day, the Father's love is like a mountain, may all the Fathers under the whole world be safe and happy, and all things will go well. At present, early rice is in the flowering stage of ear pumping to filling, which is the occurrence period of various diseases and insect pests such as ear neck blast, striped blight, and rice longitudinal leaf borer. Judging from the occurrence of diseases and insect pests this year, the rice longitudinal leaf borer and rice planthopper of the two migrated pests have been more serious, and the rice longitudinal leaf borer in Guangdong, Guangxi and Fujian has been the heaviest year in the past decade. Some farmer friends asked: Recently, there has been a lot of rain, and the rice pattern blight is serious, what medicine can be used to control it?
Rice blight is a common disease, commonly known as "flower foot plague", after the onset of the disease in the rice base stem, leaf sheath or leaf formation of moiform spots, when the humidity is large, white hyphae can be seen, mostly in high temperature, high humidity conditions occur and aggravated. In recent years, rice direct broadcast is popular, the sowing of conventional rice is generally large, June is the rainy season (as the saying goes, "mango seed summer solstice is water festival"), easy to form a high temperature and high humidity environment, the severity of blight has a trend of increasing year by year.
The period from pregnant ear to panicle extraction is the peak of the incidence of striated blight. According to the latest phase of the disease and insect situation in Jiangxi Province, the early rice panicle blight is more severe, the disease cluster rate in the area south of Ji'an is generally 10-30%, the high 40-50%, the highest in Xinfeng County is 96%; the disease plant rate is generally 4-9%, the highest 15-20%, the highest in Xinfeng County is 51.7%, and the disease cluster rate and the disease plant rate increase by 18% and 22% year-on-year, respectively. If the blight is not well controlled, there will be large-scale lodging and yield reduction in the late stage of rice growth, and the cost of mechanical harvesting will increase.
Prevention and control agents: Jinggang • Craystis, Jinggangmycin, propiconazole, fluconazole, pentazole, hexazole, thiafromamide, benzo propyclazole, oxime ester pentazole, benzothiazide, thiofuran hexazole, fluamide pyranosyl ester, etc.
Preventive medication or the initial stage of the disease can choose thiofurtamide, benzopyrimidate and other agents with a long duration of validity, if the occurrence of rice blight is serious, can be thiothiamide • hexanazole, benzo • propiconazole, fluamide • thiocimide and other compound preparations, can also be used well-gangmycin + thiafuramide or pentanzool and other azole agents, jinggangmycin has a good therapeutic effect, the duration is short, should not be used alone. In order to improve the efficacy, silicone can be added as a synergist, but also to promote the formation of waxy layer and silicified cells of rice plants, to prevent the invasion of blight bacteria, and to spray the liquid to the base of rice with sufficient water. Organic rice can be controlled by Jinggang • Wax Sprouts, Jinggangmycin, Shenzinmycin, And trichoderma Harz.
Considering that high temperature and high humidity are conducive to the occurrence and prevalence of blight, the water management of rice in the middle and late stages should be rationally irrigated according to temperature changes, high temperature day and night irrigation, suitable temperature should be shallow water irrigation, keep the field moist, can reduce the occurrence of blight. In the process of rice planting, partial nitrogen fertilizer and medium and late application of nitrogen fertilizer should be avoided, and potassium fertilizer and silicon fertilizer should be increased, and silicon fertilizer can make the plant form silicified cells in the body, and the cell wall of the stem and leaf surface layer should be thickened, which can improve disease resistance.
Precautions: Oxazolidol, valbutazole and other azole agents inhibit growth, suitable for use before the jointing stage, jointing pregnant panicle stage (in the upper part of rice 3 pulling joints between the long-term) should not be used in excess.
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