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, 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 number of moths per day of 22.3; at present, various insect states and larvae exist at the same time in the field, and the larvae are mainly older larvae; it is expected that the early and middle October will be the peak stage of low instar larvae, and will gradually enter the overwintering stage with 1-2 instar larvae. Therefore, all units in Greece organize a prevention and control in order to reduce the overwintering base and reduce the pressure of prevention and control in the coming year.
Prevention and control methods: in the first and middle of October, 20% diflubenzuron suspension 3000-4000 times, or 25% diflubenzuron Ⅲ suspension 2000 times, or 1.2% bitter tobacco EC 1500 times, etc. can be evenly sprayed with water.
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How to control gray spot of Euonymus tomentosa?
The methods to control the gray spot of Populus tomentosa are as follows: first, strengthen plant quarantine and select healthy seedlings. Second, strengthen tending and management, cultivate strong seedlings and enhance plant disease resistance. Third, thoroughly remove diseased leaves and diseased fallen leaves in autumn, winter and early spring, concentrate on burning, and reduce the source of infection. 4. in the early stage of the disease, the plants were sprayed with 200-fold liquid of non-toxic high-fat membrane every 20 days for 3 to 4 times continuously. Fifth, during the epidemic period of the disease, spray 50% carbendazim or 75% chlorothalonil 500 to 1000 times, use alternately, spray 4 to 5 times continuously.
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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 half-known fungi such as ColletotrichumgriseamHeaidetWaif and G
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