Prevention and treatment of fruit rust spot

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Fruit rust spot, also known as fruit rust, is a physiological disease of the fruit epidermis, which is the result of a physiological protective response that occurs when epidermal cells meet with adversity.

In general, tree rusts with strong tree vigor, lush foliage, and vigorous growth occur lighter; trees with weak tree vigor and small shoot growth have serious fruit rust. Different levels of cultivation and management, fruit rust occurred in varying degrees. For example, in fruit orchards, winter irrigation and spring irrigation, fruit rust occurs lightly, and vice versa. In different tree ages, fruit rust on young saplings aged 5 to 6 years is more serious than that of trees older than 10 years old. At the same time, the extent of fruit rust between different varieties is also different.

The main symptoms of peel rust are rust and rust. Rust: also known as "skin", generally in the fruit epidermis to form a layer of irregular shape, size and size of yellow-brown plaques, occur in the fruit of the ankle and chin; rust, also known as "fruit point" It is a yellowish-brown spot centered on the pores of the fruit's epidermis. Small, such as the tip of the needle, large as the tip of the pen, sometimes sparse, sometimes dense, the entire fruit surface can occur.

Causes: (1) Cultivation measures. Such as nitrogen fertilizer is not balanced, excessive humidity, orchard density is too large. (2) It has a close relationship with seasonal climate conditions such as temperature, moisture, and light. (3) Pesticides and harmful dust pollution damage the fruit surface. (4) Mechanical damage. Fruits cause skin damage due to friction or collision with branches or other objects due to external forces; scraping fruit surfaces when bagging or bagging can cause rust on the fruit surface. (5) related to pests and diseases. Some pests and diseases that often occur in orchards can cause fruit rust. According to the survey, the occurrence of powdery mildew in the spring often results in unclean fruit surfaces and the formation of fruit rust.

Control measures: (1) Selection of disease-resistant varieties. (2) Cultivate rational trees and reduce the humidity in the park. (3) Elimination of wintering sites for pests and diseases, reducing the number of pests and overwintering populations, reducing the pressure on pest control during the flowering period and young fruit period of fruit trees, reducing the number of medications used during the period, avoiding too frequent use of fruit in young fruit trees, and inducing fruit rust. 600 to 800 times. (4) Balanced fertilization and reasonable load; based on the application of organic fertilizer, formula fertilization based on orchard results; attention should be paid to improved soil, combined application of nitrogen, phosphorus, and potassium and its trace element fertilizers, strict thinning and thinning of fruit, Control production to improve quality and prevent the tree from becoming weak. (5) Rational use of chemical pesticides. (6) Fruit bagging.

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