Drug selection is inaccurate. There are many pharmaceutical agents for controlling scab on the market. Some varieties are both cures and not cures, some are compound preparations, and some are not up to standard. Individual farmers tend to use compound or concurrently treated varieties to save trouble, resulting in poor control. Countermeasures: To regular agricultural resources store purchase. Choose high-potency, long-acting long-term systemic high-quality carbendazim or 70% thiophanate-methyl, generally 50% carbendazim WP 100g or 70% thiophanate-methyl WP 70 to 100 grams of spear spray. In areas where carbendazim is used more frequently and the proportion of resistant strains is higher, carbendazim can be used interchangeably with tebuconazole, or a combination of carbendazim and tebuconazole can be used.
Retreatment is not heavy defense. Wheat scab can be prevented from being cured. Some farmers are accustomed to treatment after onset. At present, the bacteria are in the incubation period. If there is more than 3 days of rainy weather, scab may be more serious. Countermeasures: Be sure to spray and prevent pesticides in the early stages of wheat harvesting and flowering (10% Yanghua). According to the weather conditions can be flexible to grasp the time, such as heading weather forecast continuous rain, should seize the early panicle stage medication; such as the heading period of low temperature and low sunshine, in the initial flowering period (5% to 10% of the plant flowering) medication.
Inadequate dose. Some farmers are saving time and labor, putting 1 mu of pesticide into a sprayer and adding 15 kg of water, so that the amount of water is too small to be sprayed evenly. Countermeasures: According to the density of wheat fields, 30-45 kilograms per mu, and at least 30 kilograms, should be the same. That is, the amount of medication per acre is evenly divided between 2 and 3 sprayer solutions.
Improper method. Some farmers focus their sprays on wheat leaves, while others do not pay attention to supplements and secondary drugs after the rain. Countermeasures: Focus on evenly spraying wheat ears, not heavy spray, no leakage spray, spray thoroughly spray. The number of medications should be taken into account in consideration of factors such as the amount of bacteria, incidence, and control effects. For the cases with heavy land mass and rainy weather in previous years, a second prevention and control is required. Generally, the second treatment is performed about 7 days after the first administration. Prevention and control, while paying attention to supplement spray after rain.
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