Landscaping: anthracnose of Populus tomentosa
[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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Opinions on the control of Ostrinia furnacalis in overwintering generation
The yellow poplar silk wild borer is one of the important leaf-eating pests of forestry plants in this area, which is mainly harmful to melon seeds and sparrow tongue. The pest has been comprehensively controlled for 2-3 times since the early spring of this year, and the pest has been effectively controlled. However, because the pest has been damaged for a long time and can last until the end of October, it is necessary to continue to track and inspect the pest. According to the two-point monitoring of Anting Ginkgo Garden and Fangtai Garden, it was reported that a moth peak appeared in the first and middle of September, and the number of moths was the highest from September 7 to 9, with an average daily moth of 22.3 per lamp.
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Control methods of yellow poplar silk wild borer in garden ornamental trees
Distribution and damage to the yellow poplar silk borer DiaphaniaperspectalisWalker also known as the yellow poplar black edge borer moth. It belongs to Lepidoptera, Pyralidae. Distributed all over the country. The larvae are harmful to Populus tomentosa, Holly and Euonymus. The insect is sudden, the light ones affect the normal growth, and the heavy ones wither and fall off, resulting in bald branches and death of the young plants. The morphological characteristics of the adult are about 23 mm in length and 48 mm in wingspan. Except for the front edge, outer edge and posterior edge of the forewing.
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