Analysis and Prevention persimmon anthracnose disease

Symptoms: The main shoot and fruit damage, and sometimes infected leaves. Shoot disease, occurs in late May to early June, initially at the surface of the small round black spots, after the change dark brown, elongated oval-shaped lesion expansion, the central depression and are slightly brown slit, to generate its Black pellets points, or conidia disk.

Pathogen: Persimmon said plate spores, different name:. said plate-like gill plate long spore spore, Amon imperfect fungi are fungi. However, no conidiophores erect, with 1 to 3 diaphragm. Conidia colorless, single-cell, cylindrical or oblong.

Transmission and incidence of conditions: the Ministry of mycelium in the shoot disease or illness Fruit, leaf scars and buds in winter. Produce spores occur next summer, by wind and rain, insects, or direct invasion from the wound. Latent period of invasive wound 3 to 6 days; directly onto the latent period of 6 to 10 days. Benefit incidence of high temperature and humidity, rain, or summer temperatures incidence of heavy wet years.

Control methods:

(1) removal of primary infection source. With Dongjian cut off diseased branches, carefully cut off the diseased branches persimmon growing season, disease results, clear the ground dropping, focus on burned or buried. Callus proposed anti-corrosion coating film cut wounds to promote wound healing.

(2) The Commission planted disease-free seedlings. When the introduction of nursery stock, careful examination of sick time discard seedlings and seedlings with a new invasion of lipid membrane, and colonization.

(3) before germination spraying lime sulfur or lime sulfur and other crystals, the rotation using a variety of medications to avoid drug resistance.

(4) In addition to prevention and treatment can not be ignored outside the protection, enhancement cultivation and management, before the flower after flowering stem end of each spray a strong spirit, enlarged stem end to increase the amount of nutrient delivery. Bacterial infection in enhancing capacity of fruit body. Especially fertilizer, water management, to prevent leggy branches generated.

(China Plant Protection Network Qiu Feng)