What are the common diseases of melon seedlings? How to prevent it?
The common diseases in the melon seedling stage include damping-off disease, blight, and rooting.
(1) Overfalling: The melon seedlings develop an immersion lesion at the root neck at the beginning of the disease, gradually turning yellow-brown, and then shrinking and contracting. The cotyledon has fallen without wilting. After the occurrence of the disease from point to film development. The disease occurs when there is low temperature and humidity and poor ventilation. Control methods: When selecting seedlings, choose the Gaoshao block to make the seedbed, the bed soil to select the field soil, and the fertilizer to be fully decomposed. When diseased seedlings are found, a copper-ammonium mixture can be sprayed. The copper-ammonium mixture was prepared by adding 2 parts of copper sulfate and 11 parts of ammonium carbonate. The mixture was well-mixed, sealed in a bottle overnight, and dissolved in 400 parts of water. You can also use 500 times the enemy liquid or antibacterial agent 401 liquid irrigation root.
(2) Rhizoctonia: At the beginning of the disease, the base of the stem became thinner, the cotyledon drooped, and the leaves wither until the whole plant died. To prevent this disease should be less nitrogen fertilizer. When the onset of the disease occurs, the root of the seedlings is watered with 70% enoxacane 1000-fold, or 50% antibacterial agent 401500-1000 times, or 25% tumefax, 50% carbendazim, 70% thiophanate-methyl Chlorothalonil 1000 times.
(3) Roots: Occurred in long-term low temperature, high humidity, oligoluminous weather, causing the cotyledon of the seedlings to droop, gradually yellowing from the green, and the roots gradually decayed, causing the upper part of the shoots to die. In order to avoid the occurrence of roots, seedling watering should be careful to avoid flood irrigation and rainy days watering, water should be promptly removed after the rain, try not to make seedlings at the same time low temperature and high humidity appeared in the seedbed.
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