Common diseases of asparagus are: rust, brown spot, root rot, blight, stem blight. China Pesticide Network Xiaobian teaches you specific prevention measures:
1 rust This disease is prone to occur in cold areas. After the disease, the surface of the stem and leaves of the plant produces rust-colored lesions, and the leaves fall off early. In severe cases, the whole plant will change color and die. Control method: The asparagus should be well ventilated and drained. The rust-resistant varieties should be selected to burn the diseased plants, and the bacteria-free water solvent and the enemy water solvent should be sprayed.
2 brown spot disease This disease occurs in the very high temperature from late July to mid-September. Many brown long and narrow lesions are formed on the surface of the stem of the diseased plant, and the leaves turn yellow, followed by leaves, which hinder the growth and development of the whole plant. The control method is to spray Bordeaux mixture, or use Daisen zinc spray treatment, and use 800 times of carbendazim wettable powder to spray the effect.
3 rots This disease is caused by a variety of pathogens. When the germs invade the roots of the asparagus, when the roots rot, the bacteria cause internal corrosion of the roots and leave the epidermis of the roots, causing the plants to die. There is no specific pesticide treatment in this disease. It can only be checked on the cultivation. Once the diseased plant is found, its roots are immediately excavated and burned. At the same time, the soil near the victim plant is fully watered with mercury to disinfect, and the asparagus should not be planted in mulberry trees, fruit trees or potatoes.
4 Blight The pathogen of this disease comes from the soil and occurs on Miao or Gongza. The plant is weak and easy to get sick. If it is cut by a knife, it is easy to be invaded by the bacteria. The diseased plant turned reddish purple from the top of the surface and eventually the whole plant died. The control method is the same as root rot.
5 stem blight The disease stem is not harmful to the leaves, the most susceptible part is the surface of the stem at a height of about 30 cm from the surface. At the beginning, the young stems appear milky white spots, and then expand into a spindle-shaped dark red lesion, which is easy to occur when the lesions are around the stems. Control method: The planting area should be drained and well ventilated. Pay attention to the later application of fertilizer, and should apply more organic fertilizer. Pick up the diseased plants at the time of planting, and do not plant the trees too deep. The pesticide network is recommended to use 0.3%-0.4% Bordeaux mixture or 50% sterilized 500-800 times solution, or 50% thiophanate WP powder to add 1000 times, spray once every 7-10 days, 2-3 times in a row. Healed.
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