Pest and disease control methods during jasmine cultivation

During the growth period, jasmine diseases include: jasmine stem rot and southern blight; pests include: jasmine leaf borer, scale insects, and carmine spider mite.

(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 extend lengthwise into stripe-like patches. The edges are dark brown and the interior is grayish brown. In the later stage, the lesion tissue rots and splits lengthwise, and black granular bodies appear. This disease occurs year-round during the greenhouse maintenance period, and is especially severe in early spring. When maintained outdoors, it also occurs in August-September. 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) Apply 70% thiophanate at 600-1000 times dilution to the lesions or paint it on 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 clivia 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 die; once seedlings are damaged, they die, 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) appropriately thin the leaves to improve ventilation; promptly catch and kill the eggs, larvae, and pupae on the leaves by hand. 3) During the jasmine growth period, spray with 50% trichlorfon wettable powder at 6000 times dilution, which has a very good control effect.

(4) Carmine spider mite. The carmine spider mite is also known as the cotton red spider mite. It 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 severe damage, affecting the growth and flowering of flowers and trees.

Control methods: In winter, weed and clean the flower nursery, and irrigate the nursery land, which can eliminate overwintering mite sources. During the period when red spider mites occur and cause 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, and 2-3 sprays are sufficient, with good results. When spraying, spray the undersides of the leaves, and be sure to spray the inner canopy branches and leaves in the middle and lower parts of the plant.