Grape root rot disease and its control technology

1) symptoms. Grape root rot affects the plant's root and neck, main roots and lateral roots. After infecting the cortex tissue, the pathogen secreted pectinase, decomposed the pectin between the cortical tissue cells, and caused the cortical tissue to disintegrate and rot. Later, the bacteria gradually spread to the xylem, which can also cause decay of the xylem. The most important feature of the disease is the growth of a white to light yellow, fan-shaped mycelium layer in the cortex of the victim root and between the cortex and xylem. The mycelial layer shows blue-green fluorescence in the dark. . In the hot and rainy season, the soil around the neck of the diseased tree often grows into a cluster of honey-yellow mushrooms, which is the fruiting body of the disease.

2) Incidence conditions. The disease is mainly spread through agricultural activities such as rainwater, irrigation water and soil cultivation. The occurrence and development speed of root rot of grape round spot is closely related to the management level of orchard.

3) Control methods.

1 Strengthen orchard management. Increase the use of organic fertilizers, apply sufficient organic fertilizers before the winter each year to promote good root development and improve root disease resistance. Strengthen the irrigation and drainage of orchards, timely irrigation when drought, but also to prevent the accumulation of water in the orchard, roots flooded. Do a good job in soil management, carefully carry out soil cultivation, deepen the mature soil layer, keep the soil well ventilated, create conditions conducive to root growth that are not conducive to the growth and development of pathogens, prevent underground pests, protect against cold in the winter, and minimize roots The production of wounds.

2 treatment of diseased plants. Suspicious diseased plants should be checked in time and the diseased roots should be cut off promptly. The lesions at the roots and stems can be scraped off with a knife. Scraped and cut wounds can be smeared with 1% copper sulphate solution or Bordeaux mixture; scraped and cut diseased tissues must be burned.

3 soil disinfection. In order to prevent the disease from continuing to spread, the diseased plants can be treated with pesticides to kill the bacteria in the soil and restore the plants' health. Commonly used soil disinfectants are: 70% thiophanate-methyl 800 times; 50% Benzene 1000 times; 50% eutectic 250 to 300 times; 70% pentachloronitrobenzene 1: 50 to 100 1% of the medicinal soil; 1% of copper sulfate solution; 3 degrees of lime sulfur, etc., the above dosage is about 10 kg per grape. This method can completely eliminate the symptoms of the diseased plants, and the growth is significantly prosperous.


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