Control of Fusarium wilt of muskmelon

Symptoms the disease can occur during the whole growth period of muskmelon. When infected at the seedling stage, the leaves of the diseased seedlings became lighter, wilted gradually, and finally died, and vascular bundle discoloration could be seen by cutting the stem. When the disease occurred in the adult stage, the plant leaves wilted and drooped from the bottom up, and some of the leaf rafters became brown or brown necrotic spots, and finally the whole plant died. Sometimes sunken necrotic stripes appear on the diseased stem, and when the air is moist, the surface of the diseased part produces a white to pink mildew layer, and finally the base of the diseased stem decays longitudinally, and the vascular bundle turns brown.

The disease is caused by Fusarium oxysporum. The pathogen overwintered mainly with mycelium and thick robe in soil, diseased body or immature bacterial fertilizer. When the conditions are suitable, the bacteria invade through the root wound or directly from the meristematic cells of the root tip to form the primary infection. When the soil temperature is 15-20 ℃, the root system of muskmelon grows badly and the wound is difficult to heal, the bacteria are easy to invade. After continuous cropping, the pathogen accumulated continuously and the disease was more serious. Acidity of soil, clay weight of soil, low-lying stagnant water, application of immature fertilizer and more underground pests are all beneficial to the disease.

Key points of prevention and control

L. Rotation, preferably with cruciferous and lily vegetables. According to the pathogenic characteristics of the pathogen and serious disease areas, black-seeded pumpkin can be used as rootstock and muskmelon scion oblique grafting to prevent the disease.

2. Water-saving cultivation techniques such as high ridge plastic film mulching or drip irrigation were adopted.

3. Fully mature organic fertilizer should be applied to reduce root damage. Water a little, and pay attention to the shallow ploughing in time after watering.

4. Before sowing or transplanting, use 50% carbendazim wettable powder, or 50% lixivium wettable powder, or 70% soil bacteria wettable powder 2 kg / 667 square meters 50 kg 60 kg, ditch or hole application. The planting hole can also be irrigated with 1500 times of Shuangxiaoling water agent, or 1000 times of 65% duoguoding wettable powder, or 3000 times of 45% Tekedo emulsion, or 1000 times of local bacteria water repellent, or 50% carbendazim wettable powder, 0.25kg / hole solution. At the initial stage of the disease, the root can also be irrigated with the same concentration of the above-mentioned agents, 0.25kg and 0.5kg per tree.