Fusarium wilt is an important disease of melon. It has a wide distribution and is seriously affected in some areas. It mainly occurs in the protected areas, and it is especially common in the planting greenhouses. The general incidence rate is 3%-5%, and serious greenhouse disease strains can reach more than 10%, which significantly affects the production of melon.
[Symptoms] This disease can occur during the entire growth period of melon. At the seedling stage, the leaf color of the diseased seedlings became shallow, gradually wilted, and finally died. The discoloration of the vascular bundle was observed in the stem. In the adult stage, the leaves of the plant wilted downward from the bottom, and the leaf margins of some leaves turned brown or brown necrotic spots were produced. Finally, the whole plant died. Sometimes there are depressions and necrotic strips on the diseased stems. When the air is wet, the diseased surface produces white to pink moldy layers. Finally, the diseased stems are rotted and disintegrated and the vascular bundles turn brown.
[Implications of the morbidity] Germs mainly overwinter in mycelium, chlamydospore, in the soil, in diseased bodies, or in unfermented fungus fertilizers. When the conditions are appropriate, the germs pass through the root wound, or directly from the apical meristem cells, forming an initial infection. Soil temperature 15-20 °C, melon root growth is poor, the wound is difficult to heal when the bacteria easily invade. Even if planted, the pathogens continue to accumulate in serious conditions. Soil acidity, soil viscosity, low-lying water, and the application of unrefined fertilizers and underground pests are all conducive to disease.
[Symptoms] This disease can occur during the entire growth period of melon. At the seedling stage, the leaf color of the diseased seedlings became shallow, gradually wilted, and finally died. The discoloration of the vascular bundle was observed in the stem. In the adult stage, the leaves of the plant wilted downward from the bottom, and the leaf margins of some leaves turned brown or brown necrotic spots were produced. Finally, the whole plant died. Sometimes there are depressions and necrotic strips on the diseased stems. When the air is wet, the diseased surface produces white to pink moldy layers. Finally, the diseased stems are rotted and disintegrated and the vascular bundles turn brown.
[Implications of the morbidity] Germs mainly overwinter in mycelium, chlamydospore, in the soil, in diseased bodies, or in unfermented fungus fertilizers. When the conditions are appropriate, the germs pass through the root wound, or directly from the apical meristem cells, forming an initial infection. Soil temperature 15-20 °C, melon root growth is poor, the wound is difficult to heal when the bacteria easily invade. Even if planted, the pathogens continue to accumulate in serious conditions. Soil acidity, soil viscosity, low-lying water, and the application of unrefined fertilizers and underground pests are all conducive to disease.
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