What to do with the soot disease of Babao Sedum
As a good-looking person in the meaty family, Babao Sedum is favored by flower friends for its thick and juicy leaves. But every time the high temperature and high humidity season comes, cinder-like black spots suddenly appear on the surface of the leaves always catch people off guard. How to scientifically prevent and control this soot disease known as the "Black Death of Plants"? This article will provide you with a comprehensive analysis from symptom identification to prevention and treatment tips. Guidelines for Identification of Soot Disease Symptoms in the early stages of the onset, the needle-tip-like brown spots appear first on the back of the leaves. If not treated in time, they will expand into circular dark spots with a diameter of 0.5-1mm within 5-7 days. At this time, it can be seen with a magnifying glass. The mycelium is forming. In the typical symptom stage, the front and back sides of the leaves are covered with a layer of soot mold accompanied by sticky secretions. Photosynthesis in the infected site is blocked, and the mesophyll cells gradually necrosis to form yellowed patches. In-depth analysis of the causes of soot disease The trio of environmental incentives When the environmental temperature is 25-32 ° C, relative humidity is>70% and poor ventilation, the growth rate of pathogenic bacteria is increased by 3-5 times. The disease rate of plants maintained on closed balconies is as high as 85%. The honey dew secreted by aphids in the insect-borne transmission chain has a sugar content of 30%, providing a perfect culture medium for coal pollution bacteria. Data shows that the incidence of disease in plants infected with scale insects is increased by 60%. The key to scientific prevention and control four-step therapy for physical prevention and control uses the thinning method to retain 50% of the light-transmitting space, and uses bamboo brackets to raise the plant 15cm to enhance bottom ventilation. It is recommended to clean the leaves with a soft brush twice a month. The chemical control plan alternately uses 1500 times solution of 25% azoxystrobin suspension and 800 times solution of 50% carbendazim wettable powder, focusing on spraying on the back of the leaves. It is recommended to apply it when the dew is dry in the morning, and the efficacy can be improved by 40%. New ideas for biological control have introduced ladybug seven-star to control aphid populations, releasing 3-5 adults per square meter. Experiments have shown that this method can reduce the insect population density by 75%, indirectly controlling the spread of soot disease.
Mastering the twelve-character policy of "early detection, frequent cleaning, pest control, and strong ventilation" and cooperating with scientific pharmaceutical prevention and control, even novice flower lovers can rejuvenate the Babao Sedum. It is recommended to conduct systematic inspections every month, establish disease prevention and control logs, and use scientific maintenance to defeat stubborn diseases.