Control methods of papaya mosaic disease

Papaya is a treasure with high nutritional value, but special attention should be paid to the harm of diseases and insect pests when growing papaya, especially the harm of papaya mosaic disease, which has a great impact on yield and quality. The following editor will introduce to you the prevention and treatment of mosaic disease, hoping to help you.

1. Symptoms

Generally, mosaic disease occurs after papaya planting for 2-3 years, the disease is spread by aphids, the incubation period can be as long as half a month, and the symptoms will be shown in all parts of papaya. The disease of the leaf is that the vein of the tender leaf is wrinkled, the end of the leaf edge is rolled down, and there are spot-like or strip-like watery spots at the base of the petiole. Yellow spots appear at the top of the middle stage of the disease, and the veins are green and transparent. In the later stage of the disease, the upper tender leaves were transparent, the middle leaves were spotted, the veins were waterlogged, the whole leaf was uneven, and the growth of the parietal leaf was inhibited. The disease of the stem is that the tender stem at the top is in the shape of strip or block water stains; after the flower and fruit is infected, the petals show waterlogged disease spots, and in severe cases, the petals are deformed, and the disease spots are gradually seen after the fruit is enlarged, showing round or oval concentric rims. In severe cases, irregular tumors appear on the fruit surface.

II. Prevention and control methods

1. Shorten the growth period

Papaya is a perennial fruit tree, and mosaic disease generally needs to be planted for 2-3 years before it will appear. If it is cultivated for one year, the occurrence of this disease can be avoided.

2. Strengthen the management among parks.

The plantation of papaya had better rotate, open up new orchards as far as possible, strengthen the management of fertilizer and water in orchards, eliminate stagnant water in time in summer, and have higher drought resistance in times of drought. At the same time, an appropriate amount of phosphorus and potassium fertilizer and farm manure should be applied to improve the disease resistance of the plant, promote the plant to blossom and bear fruit early, harvest early, achieve the harvest of the same year, and reduce the harm of mosaic disease.

3. Clear the garden

Planted in spring and harvested in autumn, the plant was immediately cut down. In winter, the whole garden was sprayed with a layer of lime powder or stone-sulfur mixture, which could put an end to the propagation of germs.

4. Prevention and cure

Timely control of aphids can reduce the spread of the disease. It is found that aphids can be sprayed with dimethoate EC, and the diseased leaves and fruits can be cut off in time at the initial stage of the disease to reduce the spread of the disease. In the early stage of the disease, the drug was sprayed every 5-7 days for 3-4 times. The commonly used agents were Ningnanmycin water agent, mixed fatty acid water emulsion, morpholine guanidine hydrochloride copper acetate.

The above is the introduction of papaya mosaic disease prevention and control methods, hope to help you, want to know more related knowledge, please pay attention to us.