1. Leaf spots
It is caused by the infestation of cylindrocarpon, etc., which is mainly caused by folate. Symptoms are black, gray and brown. In the early stages of the disease, the water stains were tanned, the latter turned to brown, the near circle or irregular, the backs of the damp were grey or grey corroded, and the backs were larger; the latter were black and brown, central grey, covered with white cortex, the body of the disease, some of which were ulcer holes, and the dark brown belt on the edge of the disease were visible.
Yunnan poda agriculture, php
Characteristics of the occurrence: winterning of the soil with mycelium and saplings. The following year, the first infection was carried out with spasms, which were produced by the disease and re-infected with gas currents and the spilling of rain. Early and more years of rainfall and early symptoms. Low-lying water catchments, poor ventilation, inadequate light and poor fat water are prone to disease. Humidity is the determining factor in the spread of the disease, which is heavy in years of frequent rainfall. It usually occurs in october and peaks in august and september。
Yunan poda agricultural high-quality phio-sapling (figure)
Brown spots
Alernaria tenuis nees. The disease is mainly infected with leaves, which generally begin at the tip of time, and in the early stages of the onset of the disease, the disease is quenched in water, followed by the loss of green and yellow, which later becomes light brown, and slowly increases to the extent that the disease evolves, the disease is mixed and the leaves on the edges of the leaf are dwindled. Irregular, light brown or deep. I've got a pattern, and it's raining and wet all day long, and there's a little bit of gray to black in the middle of both sides of the disease.
Yunnan poda agricultural high-quality philipina (map)
Pathogens have winterized and survived in the soil of the host plant. The spread of rain, wind and water is mostly caused by weak foes, with high levels of wetness resulting in severe depression and poor ventilation. In general, there was a peak in july-august。
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