Common Pests and Diseases in Jasmine Cultivation and Their Control Methods
What pests and diseases should be controlled in jasmine cultivation? The diseases that need to be controlled in jasmine cultivation include: jasmine stem rot and southern blight; the pests include: jasmine leaf borer, scale insects, and red spider mite (Tetranychus cinnabarinus). (1) Jasmine stem rot. This disease occurs at the base of the stem. In the early stage, the lesions are brown spots with a water-soaked appearance. The lesions expand longitudinally into...
What pests and diseases should be controlled in jasmine cultivation? Let me explain.
The diseases that need to be controlled in jasmine cultivation include: jasmine stem rot and southern blight; the pests include: jasmine leaf borer, scale insects, and red spider mite (Tetranychus cinnabarinus).
(1) Jasmine stem rot. This disease occurs at the base of the stem. In the early stage, the lesions are brown spots with a water-soaked appearance. The lesions expand longitudinally into streak-like patches. The edges are dark brown, the interior grayish-brown, and in the later stage the lesion tissue rots and splits longitudinally, with black granular bodies appearing. This disease occurs year-round during the greenhouse maintenance period, and is especially severe in early spring. It also occurs in August-September when maintained outdoors. High temperature and humid conditions favor the occurrence of the disease.
Control methods: ① When potting the plants, spray with 0.2-0.4 degree lime sulfur mixture; ② You can use 70% thiophanate at 600-1000 times dilution to smear the lesions or paint the branches and trunk, or use thiram at 500 times dilution, which also gives good results.
(2) Southern blight. For the damage situation and control methods of southern blight, see Kaffir lily southern blight.
(3) Jasmine leaf borer. The jasmine leaf borer is one of the main pests of jasmine. Its larvae feed on jasmine leaves, flower buds, small branches, and new shoots. Once the bark of small branches is eaten, they wither and die; seedlings die after being damaged, seriously affecting the growth and flowering of jasmine.
Control methods: ① In winter or early spring, remove dead branches from the plants and fallen leaves on the ground, and burn them in a centralized manner; ② Thin the leaves appropriately to facilitate ventilation; promptly capture and kill the eggs, larvae, and pupae on the leaves by hand. ③ During the jasmine growing period, spray with 50% trichlorfon wettable powder at 6000 times dilution, which has a very good control effect.
(4) Red spider mite (Tetranychus cinnabarinus). The red spider mite, also known as the cotton red spider, can damage many flowers and many greenhouse plants. Jasmine is one of the commonly affected flowers. The leaves of affected flowers first show small yellowish-white spots, which gradually turn red and spread to the entire leaf, causing the leaves to curl, turn yellow, and fall off. This mite develops very quickly and causes serious damage, affecting the growth and flowering of ornamental plants.
Control methods: In winter, weed and clean the flower nursery, and irrigate the nursery site to eliminate overwintering mite sources. During the period when red spider mites are causing damage, spray with 40% dicofol emulsifiable concentrate at 1500-2000 times dilution (or 50% tetradifon wettable powder at 1500-2000 times dilution, or 40% omethoate at 1000-1500 times dilution) for control, spraying once every 7 days, 2-3 times in total, with good results. When spraying, spray the undersides of the leaves, and pay attention to spraying the inner branches and leaves of the middle and lower parts of the plant.
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