Control of anthracnose of Euonymus 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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Cultivation of dwarf Dahlia
Dahlia is very popular because of its rich colors, large flowers and simple cultivation. The following introduces a cultivation method of dwarf Dahlia for your reference: dwarf Dahlia is mainly propagated by cutting. The stem segments with 2 to 3 buds (stem nodes) were cut from June to July for cutting. Cutting substrate should be well breathable, non-stagnant materials, such as perlite, vermiculite and so on. When cutting, first insert a hole in the substrate with a thin bamboo stick equivalent to the cutting base, and then put the stem into the hole.
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Control of powdery mildew of Euonymus tomentosa
Symptoms: the disease harms leaves and shoots. Most of the disease spots were distributed on the front of the leaves. At the beginning of the disease, there are many small white round spots scattered on the susceptible leaves, which gradually expand, heal each other and become irregular spots. When the disease is serious, the infection rate of new shoots can reach 10%. White powder appeared on the whole leaf and shoot surface. The diseased leaves gradually fade green, turn yellow, and finally turn brown and black. The diseased part is deformed, the diseased leaf is shrunk, and the diseased tip is twisted and atrophied. The pathogen is Oidiumeuonymi (Are.) Sa.
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