Wheat scab, also known as rotten wheat head, withered white ear, is a fungal disease, generally reduced by about 10%, the year of pandemic, can reduce production by 20% -30%. If it is not properly controlled, it can result in serious reduction of wheat production, or even production. According to the forecast of the meteorological department in the near future, precipitation in most areas of Shandong, Hebei and other provinces in May was higher than usual. From May 2 to May 11, most areas have 4-5 days of continuous rainy weather. For example, when it comes to heavy fog, hazy weather, etc., it can easily cause condensation in the field for a long time, creating conditions for the occurrence and epidemic of wheat scab.
According to many years of experience and observations, wheat scab has a direct relationship with weather and humidity. Prevention and control of scab must catch wheat to prevent flowering. This is a critical period for prevention and control of scab, once Missed, it is difficult to achieve the desired effect.
In addition, there are significant differences in the effect of medication at different time periods. Some farmers choose to use pesticides at the booting stage, or at the end of flowering, and even if they see the pink mold layer before they begin to use the medicine, it is either too early or too late to grasp the best period of prevention and control. Although it has sprayed medicine, The effect is not ideal. According to many years of prevention and treatment practice, the best time for controlling wheat scab must be sprayed when the wheat is up to 5%.
There are many pesticides used to control wheat scab, and tebuconazole, prochloraz, cyanocastrobin, etc. can be selected. In order to improve the control effect, attention should be paid to mixed drug use and alternate drug use to prevent drug resistance.
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