Cucumber Wilt Disease-free Control Technology

(1) Symptoms and epidemic patterns Cucumber wilt disease, also known as turfgrass disease and wilt disease, is one of the most important diseases of cucumber. Cucumber from the seedlings to adult plants can be disease, the incidence of flowering to the results of the heavier, the field incidence rate of 10% -30%, greenhouse, greenhouse cucumber damage is heavier, often causing the whole plant withered, significantly reduced production. Typical symptoms are wilting of stems and leaves, vascular bundles of plant stem vines become brown and necrotic, water can not be transported upwards through the catheter, causing the leaves to gradually wilt from bottom to top, obvious at noon, sooner or later return to normal, no longer recover after 2-3d, leaves all The wilting droops and the plant dies. The base of the diseased stem is slightly constricted, often longitudinally cracked, and the surface is exuded with pink gum; when it is wet, the roots are rotted and easy to pull up. When the seedlings are onset, some of them cannot be rotted or unearthed. Some of them are dehydration at the top and the cotyledons are drooping, the bases of the stems are browning and shrinking, and trips occur. The pathogenic fungi overwintered on soil residues in the soil and had strong viability. They could survive for 5-6 years, and the seeds and uncomminuted livestock manure could also carry the bacteria. It spreads through irrigation water, rainwater, and insects. It invades the wounds or root hairs of plants, parasitizes in vascular bundles, obstructs catheters, and can secrete toxins to cause disease.
(2) Prevention and cure method 1 Agricultural control and non-guatema vegetables are cultivated for more than 3 years; grafted roots are used for cultivation; black-skin squashes are used as root stocks to prevent disease; soils are sterilized by high temperature during recreation in summer shelters; watering It is best to use the drip irrigation under the membrane to find out how to control the pouring of small water, and to remove the rooted soil immediately after the disease is found, and to bring it out of the field to be deeply buried or burned. At the same time, inject 20% lime or milk around the disease hole and 40% Daisen ammonium water agent 400 times, soil disinfection, to reduce the bacteria source; in the morning when the dew is not dry, apply lime and ash mixed powder to the root of the plant (1 part of lime mixed with 3-4 parts of plant ash) .
2 Chemical control 50% carbendazim WP or 50% thiram wettable powder before sowing, the dosage is 0.1% and 0.4% of the seed weight respectively, or 100 times that of formalin Seed soaking for 30 min, rinse with clean water and germinate after germination; before planting, apply acupuncture point or ditch gufenfu mixture (70% thiophanate-methyl and 50% thiram, etc.), and add 50 times more finely ground soil. 667 square meters of application of 2.5 kg, significant control effect; use 40% anti-dry or 50% benomyl WP 1000 times, or 95% of the 750 times the enemy soluble powder 750 times, or 10% fengli Agricultural 400-500 times, or 30% DT fungicide 300 times, or 10% double-effect Ling agent 300 times Irrigation roots, irrigation 250-500ml per plant, every 7-10d irrigation, a total of irrigation 2- 3 times; preferably in the flowering and fruit setting stage of cucumber, use 90% crystal trichlorfon 500 g plus 50% thiophanate WP or 50% carbendazim WP 500 g to irrigate 60 liters of water and 200 ml per plant. 7-10d irrigation once, with 2 times can control the development of the disease; with a fortune mixture 50 grams of flour plus 500 grams into the drug into the roots of cucumber stem disease.

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