Control of powdery mildew of Euonymus tomentosa
Symptoms: The disease damages leaves and branches. The disease spots were mostly distributed on the front of leaves. At the initial stage of disease, many small white circular spots were scattered on the infected leaves, which gradually expanded and healed with each other, becoming irregular large spots. When the disease occurred seriously, the susceptible rate of new shoots could reach 10%. White powder appeared on the whole leaf and shoot surface. The diseased leaves gradually fade green, yellow, and finally brown and black. The diseased part is deformed, the diseased leaves shrink, the diseased tips twist and atrophy.
Pathogen: Oidium euonymi (Are.) Sacc.)，Subphylum belonging to the semi-known fungi, hyphomycetes, hyphomycetes, powdery fungi.
Pathogen overwinters in diseased plants by mycelium. In the spring of the following year, the pathogen produced a large number of conidia, which were spread by air current and infected. Conidia can reproduce and reinfect. The pathogen parasitizes on the surface of host branches and leaves, and produces haustoria to absorb nutrients deep into epidermal cells. High summer temperatures are not conducive to disease development. Plants planted in shade had more disease, and adjacent sunny plants had less or no disease. Young leaves and new shoots were seriously affected, while old leaves were lightly affected.
Control: ① Reduce infection source: Remove fallen leaves and diseased shoots in winter and destroy them intensively. (2) Chemical control: in the early stage of disease, spray 25% triadimefon wettable powder 1500-2000 times solution, or 70% topozin wettable powder 800-1000 times solution, or Bomei 0.3-0.5 degree stone sulfur mixture, or 50% tuijunte wettable powder 800 times solution, spray once every 10-15 days, spray 2-3 times.
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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 monosporium (
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A preliminary study on the famous carved wood of boxwood and its substitute
The main results are as follows: 1 the basic situation of buxusspp belongs to buxaceae and bunus, which is called boxwood in English. For evergreen shrubs or small trees, there are more than 70 species in the world, distributed in Europe, Asia, tropical Africa and Central America. There are about 17 species in China and 8 species in Yunnan. According to the record of Chinese Timber Chronicles, there are small tree timber forests distributed or cultivated in Shennongjia Forest region of Hubei, Wuyishan Mountain of Jiangxi Province and Sichuan Province, and there are Populus tomentosa with DBH about 30cm in Laoshan Forest Farm of Shandong Province.
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