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What are the control methods for gray leaf spot on Japanese euonymus (Euonymus japonicus)?
Control methods for gray leaf spot on Japanese euonymus: 1. Strengthen plant quarantine and use healthy seedlings. 2. Strengthen tending and management, cultivate strong seedlings, and enhance the disease resistance of the plants. 3. In autumn, winter and early spring, thoroughly remove diseased leaves and fallen diseased leaves, and burn them in a centralized manner to reduce the source of infection. 4. In the early stage of the disease, spray the plants once every 20 days with a 200-fold dilution of non-toxic high-fat film, for 3 to 4 consecutive sprays. 5. During the epidemic period of the disease, spray a 500- to 1000-fold dilution of 50% carbendazim or 75% chlorothalonil, used alternately, for 4 to 5 consecutive sprays.
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What are the symptoms of gray leaf spot on Japanese euonymus?
Symptoms of gray leaf spot on Japanese euonymus: it occurs on the leaves of Japanese euonymus. In the early stage, small chlorotic yellow spots appear on infected leaves, then gradually expand into irregular large spots that are gray, grayish white or light loess yellow. The boundary between diseased and healthy tissue is often brown or dark brown, and the edge is often raised. In the later stage, several spots often merge into one, occupying one-half to one-third of the total leaf area. When the damage is severe, diseased leaves may drop in the same year or even cause twig dieback.
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