At present, it is a critical period for wheat scab control. From the past experience, many farmers have misunderstandings in the prevention and control, resulting in unsatisfactory control effects. The specific performance is in the following aspects:
1. The problem is not comprehensive. In the prevention and control of wheat scab, there are three things to look at: looking at the sky, looking at the seedlings, and looking at the ground. Now farmers generally can distinguish the occurrence probability of scab according to the weather conditions, but ignoring the influencing factors of field humidity and variety differences, they cannot effectively prevent and control in time. Wheat scab.
2. Did not seize the best time for prevention. The occurrence of wheat scab is generally concentrated in the flowering period, that is, in the middle and late April of each year (the flowering period of normal wheat). The best time to apply the drug is in the early stage of wheat flowering (Yanghua 5%), but many farmers have not grasped This critical period of medication causes unsatisfactory prevention effects. In addition, the following situations should be paid attention to when using the best medicine for prevention and control: If the heading period is sunny, the temperature is high, and the wheat is heading and raising the flower, then the medicine can be used at the full heading period; if the temperature is low and the sunshine is low, the wheat Heading first and then raising the flower, it is advisable to use the medicine at the beginning of the flowering period; if the heading period catches up with the rainy weather, and the scab is likely to be prevalent, spray the medicine rather early or late. Repeated spraying for prevention and control; if a systemic agent with good systemicity and long shelf life is used, the control time can be advanced to the early stage of wheat heading.
3. Ignore drug resistance. The earliest chemical agents for preventing and treating scab were mostly carbendazim and other benzimidazole fungicides, but as the years of use increased, scabs developed serious resistance to this type of fungicides. According to the investigation by relevant professional departments, the areas that developed resistance have spread from the original Zhejiang area to most areas of Shanghai and Jiangsu, and priority should be given to acetofen, tebuconazole, prothioconazole and other agents and their compound preparations. Use carbendazim and its compound preparations. Try to use microemulsions and other rain-resistant scouring formulations, and pay attention to the rotation of different types of agents to delay the emergence of drug resistance, improve the control effect, and reduce mycotoxin pollution. In addition, we should pay attention to the promotion of new pharmaceutical varieties, such as tebuconazole, prochloraz, cyprofen and so on.
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