Celery "double rot" disease mainly refers to heart rot and black rot. Heart rot mainly harms the growth point of leaves, and black rot mainly damages the roots and stems, which is seriously harmful to celery. The China Pesticide Network Xiaobian gives you advice to prevent and cure diseases, as follows:
First, the symptoms and harm to heart rot: a physiological disease, the main symptoms are dark green leaves of celery, dried yellow leaves, rot. The cause of the disease is the lack of calcium and boron in the soil, or continuous cloudy days. After rain and fine weather, the celery root is difficult to absorb calcium and boron.
Black rot: Mostly infected on the ground, sometimes infested with roots. After the disease, the affected part will be grayish brown. After expansion, it will become dark green or dark brown. The epidermis of the initial disease is intact, and the rupture reveals that the subcutaneous tissue becomes black. Rotting, especially the surface is perishable, the leaves are drooping, with a wilting shape, the rot rarely spreads up or down, the disease part produces many small black spots, the severe outer leaves rot and fall off, and the whole tree dies. According to the pesticide network , these two diseases directly cause losses or even failures for farmers.
Second, prevention and treatment methods 1, the initial stage of the disease, available 25% metalaxyl cream mildew 1000 times liquid + Jingbo calcium 800 times liquid + boron fertilizer 1000 times liquid or 25% pyraclostrobin 2000 times liquid + report agricultural vigor 750 times liquid or oxazolone sensation 1500 times liquid + full garden green leaf fertilizer 1000 times liquid can be effectively prevented.
2, after the onset, pesticide manufacturers recommend the use of 25% metalaxyl cream, mildew 600 times liquid + 70% thiophanate 600 times liquid + Jingbo calcium or 25% pyraclostrobin + 64% cream Manganese-zinc 1000 times liquid + 750 times of agricultural vigor, sprayed once every 3 to 5 days, continuous spraying 2 or 3 times can effectively control no longer occur.
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