Ornamental Plant Powdery Mildew Prevention and Control

Drug control strengthens the disinfection of the environment and tools. The use of 50% thiophanate-methyl and 50% thiram (1:1) mixture 600 to 700 times liquid spraying basin soil or seedbed, soil, up to bactericidal effect.
Before the onset of disease, it is necessary to spray drugs for prevention. Before germination in early spring, spray carbendazim WP 600 times to kill overwintering germs. After the leaves are planted, the carbendazim wettable powder 1000 times solution is sprayed every half month for 3 to 4 consecutive times to consolidate the preventive effect.
After the onset of drug prevention and treatment measures should be taken. In the initial stage of powdery mildew, spray 50% benzene to wettable powder 1000 times, 15% triadimefon (triadimefon) wettable powder 1000 times, spray once every 7 days to 10 days, spray first After the branches of the leaves, they are sprayed 3 to 4 times, which can effectively control the occurrence of diseases. Can also be used abroad to prevent powdery mildew effective agents, such as oxaminamine, diazepam and so on.
After the disease spreads, it can spray 40% triadimefon carbendazim WP 1500 times, or 25% triadimefon WP 1500 times, spray 2 to 3 times, once every 10 days to 15 days. The above-mentioned drugs were used alternately, and the control effect was significant.
The residual period of triadimefion is up to 20 days to 25 days. After spraying, the white powder layer of the victim site becomes dark gray, shrinking and disappearing.
For the conservation of the family ornamental plants, alcoholic cotton balls can also be used to wipe the affected parts for three to four times, which can make the powdery mildew disappear quickly and have no harm to the plants.
Sulfur powder can be used for greenhouse winter control. The sulfur powder is applied to the heating equipment to volatilize it and can effectively prevent rose powdery mildew. The suitable temperature for the use of sulphur powder is 15°C to 30°C, preferably at night so as not to cause danger to humans and animals during the day.
Spray pesticides should be noted that the entire plant should be sprayed, the drug should be used alternately to prevent drug resistance. (Guo Hongna)