Apple Rot Disease

May 13 07:16:19, 2019

1. Symptoms: The main damage is the trunk and it also damages the fruit. At the early stage of disease, the diseased part was red-brown, slightly raised, water-stained, and the tissue was soft. The diseased department often sheds yellow-brown juice, and the rotten cortex is red-brown in color, wet and rot, and has a distiller's grain smell. In the latter part of the disease, the body shrinks and darkens, with black spots. Hazardous fruit forms a dark red-brown irregular ring-shaped lesion.
2. Infection cycle: The pathogens overwinter on the bark of the disease, weak parasites, and can only invade from the wound. May-August is the time when the germs have spread and infested. First, the potential for latent accumulation on the skin layer, the formation of surface collapse, the weak began to expand the damage. Two peaks of expansion were formed in the middle of the year, from March to May and from October to November.
3. Incidence conditions:
1 tree nutrient status. Strong resistance, weak resistance to disease.
2 Freezing damage, weakened tree vigor creates invasive conditions for germs.
3Insufficient organic manure and fertilizer, lack of phosphorus and potassium, affecting the resistance of the tree.
4, prevention and control methods:
1 Strengthen the cultivation and management, and improve the resistance of the tree.
2 Do a good job in clearing the garden, remove orchard diseases, residues, and tissues, and reduce the source of germs.
3 Scratch and cure the lesion in time, cut or scrape into a prismatic shape, apply 50% Formamide or 21% arsenic solution.
4 before germination spray control agent sterilization source, the United States and the United States-fortune 80-100 times; or 200 times more sodium pentachlorophenol albino 100 times arsenic mixed spray. In May-September, spray the bactericide to spray branches and protect the trees.
5 prevention and control of trunk diseases and pests, disease bridge, increase tree vigor.
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