Common Diseases and Prevention of Apple Trees

Rot disease

Symptoms: Rot disease, commonly known as rotten skin disease, is a devastating disease. There are two types of ulcers, ulcers and branches. Ulcers mostly occur in the debilitating tree. There are two peaks in the spring and autumn. The early stage of the disease is reddish-brown water-like protrusions, which often appear yellow brown juice, late loss. Underwater collapsed into a dark brown, cracked edges and a large number of small black spots on the surface. Branches often appear on branchlets and debilitating branchlets. The early diseased part was reddish-brown and irregularly shaped. Afterwards, the shoots quickly spread to the entire shoot and eventually caused the branches to die. When the fruit was damaged, the lesions were reddish-brown, round or irregular in shape, with camouflage and sharp edges. Black dots often form in the middle. Appearance peaked in February-March, peaking in May, and there was a small peak in September-October. Prevention: mainly to enhance tree vigor and improve resistance to disease. 1 Reasonably adjust the number of results and maintain the tree potential. Prune before winter and spray or apply 20 times to the old tree once. It is sprayed with 40% methine WP 100 times from late 23rd to early April. 3 In the late June and early November, the sickness was scraped and the depth reached the xylem, and the diseased branches were cut off. The trunk and main branches were brushed with 50% Formamide WP 100 to 200 times. In addition, it should also pay attention to increase phosphorus and potassium fertilizers.

Spotted leaf disease

Symptoms: Alternaria leaf spot disease, also known as Brownie disease, the first appeared in the victim leaves a number of brown dots, later expanded into a diameter of 5 to 6 mm red-brown round spot, the center often dark dots or concentric ring pattern, surrounded by Dark brown ring pattern. When the weather is wet, dark green to black mould grows on both sides of the diseased area. In the later and later stages of the disease, some of the lesions expanded into irregular shapes, and the leaves were perforated or broken. In general, after the exhibition began in mid-May, from June to August, it was a period of severe damage. The rainfall was heavy for a long time. When it was severe, it began to fall in mid-July and it could fall in mid-August. Poor ventilation, partial application of nitrogen fertilizer, tender branches and weak tree weaknesses in the case of severe disease. Prevention and control: The focus of prevention and control is to protect the early leaves and stand on the defense. It can be combined with ringworm disease, anthrax and lepidopteran, leaf-eating pests for prevention and treatment. 1 After the apple leaves fall, it is necessary to clear the garden in time, and the dead leaves are buried or burned. After spraying in mid-December, spray 1:2:200 times Bordeaux mixture, 70% Mancozeb wettable powder 400 to 600 times, 50% Propionin wettable powder 1000 times or 75% chlorothalonil wettability 800 times liquid powder, spray once every 15-20 days, alternating medication, spray a total of 3 to 4 times.

Seed Treating Machine

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Seed Treating Machine

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