Plum brown rot, also known as Sclerotinia, gray rot. In recent years, high orchards have occurred in some orchards, seriously affecting the yield and output value of plums.
First, the symptoms
Brown rot frequently occurs in fruits, and the onset time is mostly in the fruit's near-mature stage. The disease was originally a brownish-brown lesion. The flesh of the diseased part turned brown and the disease spread rapidly. Within a week, the whole fruit could be expanded. When the fruit matures rapidly, the air is long and the fruit rots faster. A circle of grainy brownish brown mold layer appears in the circle around the lesion and is arranged in a concentric ring pattern. A few diseased fruits fall to the ground, but most of the diseased fruits hang down and hang Branches.
Second, the incidence of conditions
1. Wounds: Wounds caused by insect pests, fruit cracks, and mechanical damage are the main pathways for pathogen invasion.
2. Rainfall: Rain is the main condition for the occurrence of brown rot. Therefore, the incidence of heavy rains in the wet years and light years in the dry years.
Third, control methods
1, remove the disease: To always check and found that the disease should be promptly removed, and concentrated burned, or buried. In particular, Li Ling cracked fruit should be promptly removed. This is an important measure to control brown rot.
2. Insect control and disease prevention: The borehole caused by the fruit of Lisamidae on plum fruits is the main route of invasion of brown rot. In particular, Qin Ling Li’s brown rot was particularly severe under conditions of heavy rainfall. Therefore, if we want to control the occurrence of brown rot, we must first prevent and control the damage of Lee small borers and leaf roller.
3, spray protection: The focus is on fruit near maturity. Spraying 800 times chlorothalonil 20-30 days before fruit harvest can better prevent fruit rot.
4. After the autumn fruit is harvested, the orchard shall be fully cleaned, the dead fruit, the diseased and disabled branches under the tree shall be completely cleaned up, and burned in a centralized manner to reduce the source of germs in the second year.
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