How to prevent and treat pests and diseases of winter jasmine? The latest technical method tutorial is here

Winter jasmine (Jasminum nudiflorum) is a deciduous shrub of the genus Jasminum in the family Oleaceae. It likes light, tolerates slight shade, is slightly cold-tolerant, and fears waterlogging. It requires a warm and humid climate, loose, fertile, and well-drained sandy soil. It grows vigorously in acidic soil and poorly in alkaline soil. Its roots have strong sprouting ability, and the parts of its branches that touch the ground root very easily. Now let us take a look at the pest and disease prevention and treatment techniques for winter jasmine!

Mosaic disease

[Symptoms] Mosaic disease is a whole-plant disease caused by cucumber mosaic virus (CMV). The symptoms are smaller, deformed leaves with dark green markings or yellowing. Infected plants do not bloom, or if they do bloom, the flowers are also small and deformed with markings. The main transmission route is virus transmission by green peach aphids and cotton aphids, and the main source of infection is infected weeds nearby.

[Prevention and treatment] First, weeds should be removed promptly to reduce the source of infection. Second, aphids should be controlled early to eliminate the virus-transmitting vector.

Brown spot disease

[Symptoms] Brown spot disease mostly occurs on Chinese primrose (Primula sinensis). It is caused by Alternaria fungi of the Deuteromycetes. Infected plants have brown spots on the leaves, and the transmission route is conidia spread by wind and rain.

[Prevention and treatment] At the early stage of the disease, spray 70% chlorothalonil wettable powder at 1000 times dilution or other fungicides.

Gray mold

[Symptoms] Gray mold is one of the common diseases of winter jasmine and occurs throughout the country. After the plant is infected, the whole plant turns yellow and dies. The disease mainly infects leaves, tender stems, flower organs, and other parts, and mostly occurs at leaf tips and leaf margins. At the early stage of the disease, water-soaked spots appear on the leaves, then gradually expand, turn brown, and rot. Later, a grayish-yellow mold layer forms on the surface of the lesions. After the stems are infected, the lesions are brown and gradually rot. After the flower organs are infected, they also turn brown and rot and fall off. Under humid conditions, a gray mold layer appears on the diseased parts, which is a major feature of this disease.

[Prevention and treatment] Planting density should be reasonable. Pay attention to ventilation and reduce air humidity. Remove diseased leaves and diseased plants promptly to reduce the source of infection. At the early stage of the disease, spray 50% procymidone or 50% iprodione wettable powder at 1500 times dilution. It is best to alternate with 65% dimethachlon wettable powder at 500 times dilution to prevent the development of fungicide resistance.

Spot disease

[Symptoms] Spot disease mainly damages the leaves of the plant. The disease spreads from the lower part of the plant to the upper part. The lesions are usually 3 to 4 mm in diameter and brown. In severe cases, the diseased leaves wither and die, causing defoliation. It is caused by Corynespora? primulae. The pathogen overwinters as mycelium or conidiomata on diseased plant residues, and seeds can also carry the pathogen, becoming the primary infection source the following year. It mainly spreads through conidia carried by air and rainwater, and reinfection is frequent during the growing season. Plants are usually susceptible under warm and humid weather and when nitrogen fertilizer is applied excessively. It generally begins to occur in July and becomes epidemic from August to October.

[Prevention and treatment] Select and breed disease-resistant varieties, strengthen fertilizer and water management, apply more organic fertilizer and phosphorus and potassium fertilizer, and avoid excessive application of nitrogen fertilizer. At the early stage of the disease, spray 70% thiophanate-methyl at 1000 times dilution plus 75% chlorothalonil wettable powder at 1000 times dilution, or 1:1:100 Bordeaux mixture.

Leaf spot disease

[Symptoms] Leaf spot disease mostly occurs on leaves and receptacles. At the early stage, water-soaked irregular lesions appear along the leaf veins, then yellow and turn brown. The lesions expand, the leaf margins dry up, and in severe cases the lower leaves wither and die.

[Prevention and treatment] Strengthen cultivation management, cultivate disease-free seedlings, sterilize seedbed soil, and ventilate greenhouses promptly to reduce air humidity. Remove diseased plant residues promptly. After the disease occurs, spray 50% copper bis(dihydrogen phosphate)? wettable powder at 500 times dilution, or 72% agricultural streptomycin wettable powder at 4000 times dilution.