What is papaya seedling root rot disease in papaya tree cultivation?
What is papaya seedling root rot disease? What harm does papaya seedling root rot disease cause? How is papaya seedling root rot disease prevented and controlled? Please provide guidance: papaya root rot disease is also called papaya root rot; the main harm of papaya seedling root rot disease: root rot mainly damages the root collar and roots, and seedlings during the nursery period and those planted not long ago are more susceptible to the disease....
What is papaya seedling root rot disease? What harm does papaya seedling root rot disease cause? How is papaya seedling root rot disease prevented and controlled? Please provide guidancePapaya root rot disease is also called papaya root rot; the main harm of papaya seedling root rot disease:
Root rot mainly damages the root collar and roots, and seedlings during the nursery period and those planted not long ago are more susceptible to the disease.
In particular, nursery land and cultivation land with a high groundwater table or poor drainage that causes water accumulation, and soil with high clay content, are prone to the disease. In the early stage of the disease, the plant shows water-soaked symptoms at the stem base, which later turn brown and rot, the leaves wither, the plant dies, and the roots become brown and necrotic; the root rot pathogen is spread by flowing water.
Prevention and control methods for papaya root rot disease:
1. The seedling shed must be ventilated and allow air and light through, and the temperature should be lowered; the seedling land and planting land must have good drainage to avoid water accumulation; before the rainy season arrives, spray 1000 ppm (about 1000-fold dilution) phosphorous acid 2 to 3 times, once every seven days, which has a good preventive effect. When using it, phosphorous acid must be prepared on the same day, and must be neutralized with an equal weight of potassium hydroxide.
2. Avoid continuous cropping, and do not practice continuous cropping with vegetable land (especially where the previous crop was Cucurbitaceae); pay attention to preventing and removing snails and ants; when diseased plants are found, pull them out, and drench the diseased holes with medicinal liquid for protection. Use 70% Dexon wettable powder at 1000-fold dilution, or 50% carbendazim wettable powder at 500-fold dilution, drenching 0.3-0.5 kg of medicinal liquid per plant, once every 7-10 days, continuously drenching 0.3-0.5 kg of medicinal liquid, once every 7-10 days, continuously drenching 2-3 times.
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