What is the relationship between wheat Fusarium head blight and humidity?
What effect does humidity have on wheat Fusarium head blight? Please give an introduction. The effect of humidity on the occurrence of wheat Fusarium head blight is greater than the effect of temperature. Long periods of continuous high humidity are the primary condition for disease onset. Perithecia can only be produced when the soil surface is wet. According to observations, when the relative humidity at the soil surface reaches above 80%, perithecia...
What effect does humidity have on wheat Fusarium head blight? Please give an introduction
The effect of humidity on the occurrence of wheat Fusarium head blight is greater than the effect of temperature. Long periods of continuous high humidity are the primary condition for disease onset. Perithecia can only be produced when the soil surface is wet. According to observations, when the relative humidity at the soil surface reaches above 80%, perithecia are produced quickly and the amount of inoculum is large; when the humidity is around 60%, the rate of perithecium production decreases and the number decreases; when the humidity is below 30%, perithecia cannot be produced. The release and spread of ascospores likewise require high humidity. When the relative air humidity is below 81%, ascospores cannot be discharged; the presence of water droplets favors the discharge of ascospores and increases the discharge rate. The main reason is that water droplets help the perithecia absorb water and thereby increase turgor pressure, thus promoting ascospore discharge. The epidemic level of wheat Fusarium head blight is significantly positively correlated with local relative humidity. Within 15-20 days after wheat heading, if warm, cloudy and rainy days with temperatures above 15°C exceed 50%, the disease may become epidemic.
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