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.
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How to reproduce jasmine in the family
If you need to breed jasmine flowers in the family, you can use the following methods: ① tender wood cuttings. In the first and middle of May, take the shoots that germinated in early spring, strong, about 8 cm long, pay attention to the old stem segment with 2 cm at the lower end, remove the lower leaves, leaving only 1-2 pairs of leaves at the top. The lower incision is about 0.2 cm below the node, and then the cuttings are cut in a loose matrix, pressed slightly, so that the cuttings are closely connected with the matrix, watered, and placed in a shaded and ventilated place. Move indoors on rainy days to avoid the rot of cuttings caused by rain. After that, keep the basin soil wet and spray water on the cuttings properly for about three weeks.
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Causes of death and key points of maintenance of jasmine in winter
The cause of death of Riley in winter: first, freezing injury: when the temperature (room temperature) was lower than 3-5 ℃, the physiological function of the plant was damaged; when it dropped to 3 ℃, it would cause the whole plant to die. Second, the basin soil is too wet: when the temperature (room temperature) is below 10 ℃, Riley is in a dormant state, and the basin soil water demand is less. If too much watering, Riley root system for a long time in the condition of no ventilation, it is easy to suffocate to death. Third, the basin soil is too dry: if it is not watered for a long time, Riley will dry up and die. In order to make Riley safe through the winter, we must do a good job of anti-freezing.
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