MySheen

Landscaping: anthracnose of Populus tomentosa

Published: 2024-11-06 Author: mysheen
Last Updated: 2024/11/06, [symptoms] Colletotrichum gloeosporioides is distributed all over the country. At the initial stage of the disease, there were water-stained yellow-brown spots on the leaves, and the boundary between the disease and health was not obvious, and then the disease spot expanded. In the later stage, the site of the disease was yellow, and small black spots (conidial disc) appeared on the spot, which were arranged into obvious or inobvious ribs. Often cause withered leaves and early defoliation. [pathogen and pathogenesis] by half-known fungi such as ColletotrichumgriseamHeaidetWaif and G

[symptoms] Colletotrichum gloeosporioides is distributed all over the country. At the initial stage of the disease, there were water-stained yellow-brown spots on the leaves, and the boundary between the disease and health was not obvious, and then the disease spot expanded. In the later stage, the site of the disease was yellow, and small black spots (conidial disc) appeared on the spot, which were arranged into obvious or inobvious ribs. Often cause withered leaves and early defoliation.

[pathogen and pathogenesis] by semi-known fungi such as anthracnose (ColletotrichumgriseamHeaidetWaif) and Colletotrichum (GloeosporiumfrigidiumSate.) Caused by infection. The sexual generation is ascomycetes (Glomerella), which also infects many kinds of flowers and shrubs. Overwintering with conidia disk in diseased body and soil, or overwintering with conidia and mycelium on diseased plant tissue. The conidia were transmitted by insects and wind and rain at the end of the following spring. Conidia invade from stomata or wounds, and Populus tomentosa can be repeatedly infected during the growing period. The disease is serious in summer and autumn every year. Generally, the disease can be aggravated under the conditions of more plant wounds, too dense plants, poor ventilation, excessive application of nitrogen fertilizer, weak plant growth and so on.

[integrated prevention and control]

The main results are as follows: (1) to eliminate the bacterial source, remove the dead branches, leaves and diseased bodies in time, and burn them, so as to reduce the re-infection and infection of the bacterial source.

(2) strengthening management and seedling cultivation should not be planted too densely, wound should be avoided as far as possible in maintenance, shell insects should be prevented and treated in time, irrigation should not be irrigated, and phosphorus and potassium fertilizer should be applied.

(3) spraying 80% anthrax Fumi wettable powder 500,800 times or 25% ou Ruiyou 2000 times in the initial stage of chemical control.

 
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