What are the conditions for the occurrence of wheat scab? The incidence of wheat scab is closely related to the climatic conditions, the amount of bacteria, and cultivation and management. (1) Climate: The high temperature and humidity of the heading and flowering stage of wheat are extremely beneficial to the occurrence of head blight. The temperature can be above 15°C, and 25°C is the most suitable. The temperature rose early in the spring and there was enough humidity. Diseases occurred earlier. At a suitable temperature of 25°C and saturated humidity of more than 36 hours, the incubation period for disease is only 2 days, lower or higher than this temperature, or the humidity is insufficient, and the incubation period is prolonged. (2) The amount of bacteria: The amount of overwintering bacteria is one of the important factors in the disease epidemic. The incidence of disease is heavy in regions and years where winter prevalence is high. However, the amount of overwintering bacteria is related to the temperature and humidity in the spring field. When the temperature and humidity are high, the ascendace shells are large when they occur; otherwise, they are few. (3) Cultivation management: there is a certain difference in disease resistance among varieties, and there are also differences in the susceptibility of different growth stages of the same variety. It is more resistant to disease in the early stage of general reproduction and is more susceptible to disease in the later stage of childbirth. The flowering stage is the most susceptible to infection during each growth period, followed by the heading period, the milk ripening period is again, and the onset of wax waxing is very slight. Early sowing, heading, early maturation, often escaped the stage of heading and flowering of susceptible plants, and the incidence was light. On the contrary, if sowing is late, the ripening period is delayed, and the flowering season is prone to rain and aggravating hazards. Poor terrain, poor drainage, high humidity in the field, excessive nitrogen fertilizer application, too late, plant growth is weak or leggy, plant resistance to disease is reduced, so the incidence is heavy.
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