What are the common pests and diseases during the cultivation of osmanthus trees?
How to grow osmanthus trees? Please guide the cultivation of osmanthus as an evergreen small tree, with varieties such as Jingu (orange-yellow flowers), Yingui (yellow-white flowers), Dangui (orange-red flowers), and Sijigui (pale yellow-white flowers). Osmanthus is not only an important landscaping tree species, but also a famous aromatic plant with high edible value. I. Prop...
What pests and diseases affect osmanthus tree cultivation? Please guide the control methods.I. Osmanthus leaf blight, also known as gray mold blight, mainly infects osmanthus leaves. Osmanthus leaf blight is a high-temperature, high-humidity disease caused by infection with fungi of the genus Phyllosticta.
Control methods: (1) Strengthen cultivation management, strictly avoid applying excessive nitrogen fertilizer, and keep nitrogen, phosphorus, and potassium in reasonable balance. Water according to the "dry-wet" principle, avoiding waterlogging in pots or garden soil. Maintain good ventilation and air permeability to improve the plant's disease resistance. (2) In gardens where the disease often occurs, carry out early prevention before symptoms appear. (3) After clearing the garden, spray 65% guangmiejun wettable powder at 600 times dilution, or 75% chlorothalonil wettable powder at 500-800 times dilution, once every 7 days, for good control results. In the following spring when new leaves emerge, spray for prevention: 30% copper oxide suspension concentrate + 50% fipronil suspension concentrate (2:1) at 1200 times dilution.
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