Due to the high temperature and heavy rain weather in recent days, it is extremely beneficial to the occurrence of soft rot and white peony disease. At present, the above two diseases have entered peak period in our district. According to my investigations at the konjac bases in Sunyang and the Central Plains, the disease rate in the fields was 2.5%, and the serious plots were 21%. Some of the plots had fallen.
Disease symptoms:
White feather disease: At the beginning of the disease, the base of the konjac petiole approaches the ground at 1 to 2 o'clock. A dark brown water-stained irregular spot appears, and then gradually turns brown and rot, further spreading around the base of the petiole for a week, causing the plant to fall off and lodging, and the disease minister turns out white. Mycelial mycelium, and finally brown rapeseed-like sclerotia.
Soft rot: Initially, dark green, oil-like irregular spots appear on the leaves. There are no obvious edges, and they spread radially along the leaf veins to the surrounding mesophylls. The leaves rot and the petiole stems rot. The rot of the petiole causes lodging and lodging, yellowing of the plant or whole plant. Yellowing, further development can lead to the death of the whole plant, in severe cases all decayed bulbs
Control methods:
1, mu 10 million units of agricultural streptomycin water 100 kg IRRIGATION, while using 70% thiophanates 80 grams WP 50 kg water spray.
2. Mu 50% thiophanate-methyl 500 times solution plus 20% ronacillus (thiabendron copper) 100 g water 50 kg spray, spraying should pay attention to spray the plant base and surface. At the same time, the diseased plants were found to be excavated in time, and the diseased areas were sprinkled with quicklime, and the above-mentioned agents were used for the plants that had not yet been attacked and were sprayed three times successively every 7-10 days to prevent the disease from spreading.
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