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The annual number of airborne spores can be divided into four distinct phases, namely the winter forecast period, the epidemic start period, the prevalence increase period and the summer and fall period. The number of spores in the winter foreseen period has little to do with the prevalence of powdery mildew. The spore trap experiment found that the rapid increase in the number of episodic spores is a manifestation of the disease epidemic, and only the epidemic initiation period is the key moment in determining the prevalence of powdery mildew in the year. .
The optimum temperature of the spore catcher was 20-25°C, and the daily average temperature was lower than 19°C or higher than 26°C, and the catch amount was significantly decreased. Rainfall can promote the settlement of spores. Therefore, there is little catch on rainy days and the amount of sunny catches after rain increases sharply. The breeze is beneficial to the spread of powdery mildew, and the spore traps increase the amount of spore traps. However, the wind speed below 0.2 m/s and above 3.0 m/s significantly reduce the amount of spores.
The number of aerial spores is closely related to the condition of powdery mildew in the forest section. The spore trap capture test showed that the number of aerial spores was positively correlated with the total forest disease incidence after 5 to 7 days. When the number of spores captured on each slide reached 10 or so, the number of spores increased sharply, and the forest section became worse after 5-7 days.
Mastering the occurrence and quantity dynamics of airborne spores during this period through spore traps is a condition and basis for predicting the final condition and determining the first application period. Spores at the end of the winter and early spring when the gum trees began to draw leaves the rubber tree powdery mildew spores, with the gum tree leaf extraction rate increased simultaneously. Subsequently, as the temperature increased, the young leaves became old, the ability to produce spores decreased, and the in-air spores gradually decreased, so that the number of missing spore traps was also affected.
The optimum temperature of the spore catcher was 20-25°C, and the daily average temperature was lower than 19°C or higher than 26°C, and the catch amount was significantly decreased. Rainfall can promote the settlement of spores. Therefore, there is little catch on rainy days and the amount of sunny catches after rain increases sharply. The breeze is beneficial to the spread of powdery mildew, and the spore traps increase the amount of spore traps. However, the wind speed below 0.2 m/s and above 3.0 m/s significantly reduce the amount of spores.
The number of aerial spores is closely related to the condition of powdery mildew in the forest section. The spore trap capture test showed that the number of aerial spores was positively correlated with the total forest disease incidence after 5 to 7 days. When the number of spores captured on each slide reached 10 or so, the number of spores increased sharply, and the forest section became worse after 5-7 days.
Mastering the occurrence and quantity dynamics of airborne spores during this period through spore traps is a condition and basis for predicting the final condition and determining the first application period. Spores at the end of the winter and early spring when the gum trees began to draw leaves the rubber tree powdery mildew spores, with the gum tree leaf extraction rate increased simultaneously. Subsequently, as the temperature increased, the young leaves became old, the ability to produce spores decreased, and the in-air spores gradually decreased, so that the number of missing spore traps was also affected.
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Roller Conveyor Systems
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