The reasons why osmanthus leaves curl
As one of the top ten famous traditional flowers in China, osmanthus is very popular for its rich fragrance. However, the leaves often curl or even fall off during the maintenance process, which makes many flower lovers feel anxious. This article will systematically interpret the causes and treatment plans of abnormal symptoms through scientific analysis. Three major inducements of osmanthus leaves curl explain that water imbalance causes physiological leaf curl. When the soil water content is less than 30%, osmanthus will activate a self-protection mechanism: leaf stomata close and reduce transpiration, showing a roll shape. It is recommended to use the "three-finger test method"-insert your finger into the soil for 3 cm, and pour it thoroughly immediately if it is dry. In summer, the substrate humidity should be kept at around 60%, combined with morning and evening leaf spraying, and a humidifier should be used to maintain the air humidity>65%. Insect pests cause mechanical curling scale insects to secrete honey dew to induce coal pollution disease, while red spiders stab and absorb leaf flesh to form a network of spots. During the peak pest period (May-June and September-October), leaf backs need to be inspected every week: scale insects are found to be sprayed with 40% quick-kill solution to 1500 times; red spiders recommend alternating use of avermectin and ethifenil, combined with physical flushing method. Disease infection caused the pathological roll leaf spot disease to initially appear brown dots and gradually expand into concentric ring-like patches. It is recommended to use a mixture of mancozeb + difenoconazole, focusing on spraying the middle and lower leaves. Preventive medication should start before the plum rainy season and be sprayed every 15 days to eliminate diseased leaves to reduce bacterial sources. Survival evaluation and rejuvenation technology of osmanthus fragrans leaves when the plant completely leaves leaves, root vitality testing needs to be carried out: a 2-mm thick root section is cut and observed, and milky white exudate indicates survival. The "three-step activation method" was used for treatment: first pruning 1/3 of the branches to reduce consumption, then irrigating the roots with brassin + alginic acid to stimulate new roots, and finally bagging to moisturize and promote buds. During the recovery period, direct light should be avoided and a suitable temperature of 18-25℃ should be maintained.
Through systematic diagnosis and precise intervention, 80% of deciduous osmanthus can be revitalized. The key is to grasp the principle of "early detection, accurate judgment, and quick processing" and combine it with scientific maintenance to make the danguthus fragrant again.