Question: Recently, some netizens "Bitansha" consulted: the surface of the peach fruit first appeared brown spots, then shrink and rot, want to know what caused this? How should we prevent it?

Dong Xin and Dong Yanbin A: According to the relevant situation reflected by netizens, combined with the comprehensive analysis of photos, the author believes that this is a typical symptom of peach brown rot. This disease is also called peach sclerotium disease, peach ash rot, and all peach producing areas occur. The rainy years and mid-late mature varieties are seriously ill. The disease mainly harms the fruit and also harms flowers, leaves and branches. When the fruit is damaged, it will first produce a brown round spot on the fruit surface. When the environment is suitable, it can be expanded to the whole fruit within a few days. The flesh becomes brown and soft, and then the gray-brown velvet mold layer grows on the surface of the lesion to form a concentric wheel. The lines are arranged, and the diseased fruit is easy to fall off after being rotted, and some water loss becomes a rigid fruit. The flower is damaged, and brown water-soaked spots appear on the stamens, stigmas, petals and bracts, which spread to the whole flower and become brown and withered. The new shoots are damaged, and there are ulcer spots, long ovals, central depressions or bulges, and sapphire molds. After the ulcer spreads or wraps around one week, the diseased part is dead.

The pathogens are Sclerotinia sclerotiorum and Sclerotinia sclerotiorum, all of which are Ascomycetes. The pathogens overwinter in the mycelium on the tree and in the frosty plaques on the ground or in the branches. In the spring of the next year, conidia are produced, which are transmitted by wind and rain, insects, insects, mechanical wounds and lenticels. It is easy to cause flower rot during the flowering period to the young fruit stage, and the fruit is warm, rainy and foggy at the near maturity stage. Management is extensive, the tree is weak, the terrain is low, and the branches are closed.

Control method:

1. Remove the diseased fruit, diseased branches and other diseased plant residues in the park in time, and destroy them centrally to reduce the source of bacteria.

2. Do a good job in the prevention and control of pests such as heartworm, peach aphid, and blind mites, reduce the chance of insect wounds and pests, and use 5.7% to kill a nest (avermectin + special effect) 750 times liquid The effect is better.

3. Spray 5 waves of sulphur sulphur or 50% chlorobromoisocyanuric WP 750 times before flowering to eradicate the source of overwintering bacteria.

4. Control of spray after falling flower: 25% azoxystrobin suspension 1500 times solution, 32.5% methicillin suspension 1500 times solution, 50% isourea suspension 1000 times solution + 21% peroxyacetic acid water 300 times liquid, 43% tebuconazole suspending agent 4500 times liquid + 54.8% chlorobromide symbiotic bacteria 600 times solution.

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