Symptomatic treatment of pear scab

On August 4, readers of the county of Shaanxi Province called the newspaper to report that after a period of heavy rain in the previous period, the local area of ​​pear orchard broke out in a large area recently, and some even approached the destruction of the garden. The fruit growers were very anxious. In this case, the reporter interviewed. Professor Lu Pinghui of the Northwest Forestry University of Agriculture and Forestry Professor Lu Pinghui gave guidance to the majority of farmers on the prevention and treatment of pear black spot disease.

symptom

The main feature of the black fungus layer in the Pear Disease Department is its main feature. The earliest onset of germination results in dark green moldy, the bud scales are not easy to fall off, and diseased buds can die. Leaf disease produces irregular lesions and grows black moldy material. Pears can be infested by young fruit to mature stage. After the disease develops, small yellow spots appear, and the mold layer grows and grows. Sometimes it does not produce moldy layer and it forms clerodendrons. The pulp in the diseased part hardens, the crater cracks, and when the new shoot senses, it produces a spot with a slightly raised legume size and produces a layer of black mold, which is later sunken and cracked.

Disease rule

(1) The pear black spot pathogenic bacteria in the form of hyphae and gowns are overwintering in sick bud scales, diseased leaves, and diseased fruits.

2 In spring, new shoots were taken from the diseased shoots. The first occurrence of the flower organ became the source of the first infestation. It was transmitted to the nearby leaves and fruits by wind and rain, and new robes spread and spread. Therefore, the number of diseases is closely related to the incidence of the year.

3 Infection can occur multiple times in a year, and high temperature and high humidity are favorable conditions for the onset.

Prevention

1 The plant is densely planted, creating an open, airy and transparent tree.

2 Do a good job in sparse fruit thinning in the early stage, control the quality of production, maintain a reasonable load, maintain a strong tree vigor and prevent premature aging of the tree.

3 The application of farm manure, appropriate nitrogen application, and application of phosphorus and potassium fertilizers and trace elements have obvious effects on improving the disease resistance of trees.

4 Change flood irrigation to shallow ditch irrigation, properly control water, discharge water in time, and pay attention to cultivating and weeding.

5 Thoroughly clearing the garden is an important measure to control the incidence of pear black spot disease. Clear the garden after harvesting fruits and leaves, remove pests and diseases, cut off pests and branches, and burn or bury them deeply.

6 Disinfect people or tools that enter the sick garden to prevent disease in healthy orchards.

7 Infected orchard drug selection DuPont Fuxing, continuous play 2 to 3 times, interval 12 days.

In addition, Lu Ping will remind farmers to avoid hitting drugs in the first half of the fruit's mature sale and prevent the products from being listed on the market.

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