Recently, some farmers have reported that celery colonization occurred more than a month ago. However, there was severe chlorosis of leaves, toughness, and toughness, and there was basically no growth. Through field observations and anatomy of the roots, it was found that the root vascular bundles turned reddish-brown and confirmed as celery. Wilt disease.
Symptoms
The celery wilt disease mainly damages the roots of celery, and both the seedlings and the adult plants can be infected. After the disease at the seedling stage, the growth is mainly slow, and the seedlings are wilting or withered when they are severe. After the onset of the plants, the leaves are chlorogenic and dull, and the leaf color is dull. The stems are aged and tough. In severe cases, the leaves chlorosis or yellow and green mottled between the veins of the veins. The vascular bundles turn red and brown, sometimes affecting the root, neck, and petiole, causing browning or root rot. Can not grow normally, and finally the whole plant withered, causing direct loss to farmers.
The law of incidence
When pathogens in the soil are overwintering and the conditions are appropriate, the pathogenic bacteria invade from the fine young roots of celery, especially when planting, the root wound is the main channel for the infection of the bacterium, and most of the parasitic pathogens in the root or root neck and petiole vascular bundles after the bacteria infestation. In the middle, due to the large number of hyphae, blocking the vascular bundles, leading to the upward transport of nutrients or moisture is blocked, thus showing symptoms of withering. Soil temperature at 20-30 °C is conducive to disease, when the temperature around 25 °C when the disease is heavy. Emphasis on the use of unripe feces, dry plots, easy to disease; seedlings have been infected with disease replanted land mass.
Control methods
First, implement crop rotation, increase the application of biological organic fertilizer (such as agricultural yeast organic fertilizer or agricultural biological organic fertilizer) before planting, cultivation of sorghum cultivation, timely drainage after rain, flood irrigation is strictly prohibited.
Second, the most important prevention and control in advance, available 70% hymexazon 600 times liquid + reported agricultural vitality factor 750 times the liquid or 51% of the treatment of chlorazone 800 times liquid + Jintai Long chase treasure 600 times or 6.25% spermacillin 1500 Times of liquid + 邯 expensive 518 liquid fertilizer 600 times liquid spray, alternate use, spray 5-7 days; two days after the onset of spraying twice, can effectively prevent the occurrence of healthy seedlings.
Third, when watering, you can use Jia has a source of life or ginseng humic acid water-soluble fertilizer 20 kg per mu, to strengthen the hair root formation, stimulate root growth, or flushing 50% Fu Mei pairs 1500 grams, inhibit bacteria reinfection.
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