Prevention and control of diseases and insect pests in jasmine culture

The diseases of jasmine during the growth period are: Jasmine stem rot, white silk disease; insect pests are: jasmine leaf borer, shell insects, cinnabar leaf e.

(1) stem rot of jasmine. The disease occurs at the base of the stem, and the initial spot is brown and watery. The plaque expands longitudinally into stripes. The edge is dark brown, the inside is grayish brown, and the tissue of the disease class in the later stage is decayed and split longitudinally, and black granules appear. The disease will occur throughout the year during the greenhouse maintenance period, especially in early spring. Outdoor maintenance also occurs from August to September. It is beneficial to the occurrence of diseases under the condition of high temperature and humidity.

Control methods: ① flowers on the pot, can be sprayed with 0.2-0.4 degrees of stone-sulfur mixture; ② can use 70% of Topol 600-1000 times solution to smear disease spots or branches, or with Fumishuang 500 times solution, the effect is good.

(2) White silk disease. The harm and control methods of white silk disease can be seen in Magnolia white silk disease.

(3) Jasmine leaf borer. Jasmine leaf borer is one of the main pests of Rongli. It eats the leaves, buds, twigs and shoots of jasmine with its larvae. The bark of branchlets withered after being eaten, and the seedlings died after being killed, which seriously affected the growth and flowering of jasmine.

Control methods: ① winter or early spring, remove the withered branches on the plant and leaves on the ground, concentrated burning; ⑧ properly thinning leaves to facilitate ventilation; timely manual capture and kill eggs, larvae and pupae on the leaves. During the growth of jasmine, ② can be sprayed with 6000 times of 50% trichlorfon wettable powder, which has a good control effect.

(4) cinnabar Ye. Cinnabar leaf cochlea is also known as cotton red spider. It can harm many flowers and many greenhouse plants. Jasmine is one of the common victimized flowers. The leaves of the injured flowers showed small yellow-white spots at first, then gradually turned red and extended to the whole leaf, causing the leaves to curl, withered and yellow. This cochlea develops rapidly and does serious harm, affecting the growth and flowering of flowers and trees.

Control methods: weeding and cleaning the flower bed in winter and irrigation in the nursery can eliminate the source of overwintering insects. In the red spider harm period, you can use 1500-2000 times of trichloropropanol EC (1500-2000 times of trichlorohydrin wettable powder, or 1000-1500 times of omethoate) spray control, spray once every 7 days, spray 2-3 times, the effect is better. When spraying, you should spray on the back of the leaves, and pay attention to spraying the inner branches and leaves of the middle and lower parts of the plant.