Planting Technology Lists
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Prevention and control of primrose mosaic disease
The symptoms occurred in the whole plant. The leaves are small, deformed, with dark green markings and yellowing. The diseased plant does not blossom, even if it blossoms, there are markings on the flowers, and the flowers are short and deformed. The pathogen is cucumber mosaic virus CMV. There are more than 190 species of dicotyledonous and monocotyledonous herbs and woody plants belonging to 45 families, such as Cucurbitaceae, Solanaceae, Compositae, Cruciferae, Rosaceae, Liliaceae and so on. There are more than 80 kinds of aphids in the route of transmission, but the main transmission vectors are peach aphid and cotton aphid. The source of infection is mainly surrounding weeds. Prevention and cure
2019-01-16 -
Brown spot disease of primrose and its control
The symptom of primrose brown spot disease: it often occurs in the four seasons. It is caused by Alternaria of the subphylum Alternaria. There are brown spots on the leaves of infected plants. The route of transmission is that conidia are transmitted by wind and rain. Prevention and treatment: spray 70% chlorothalonil wettable powder 1000 times liquid and other fungicides at the initial stage of the disease.
2019-01-16 -
Control of Brown spot of Primula
Symptoms are easy to occur in the four seasons. The leaves are brown spotted. The pathogen Alternariasp. It is a semi-known Alternaria. The conidia are transmitted by wind and rain. Prevention and treatment methods spraying 70% chlorothalonil wettable powder 1000 times liquid and other fungicides at the initial stage of the disease.
2019-01-16 -
Control of Brown spot of Primula
Symptoms are easy to occur in the four seasons. The leaves are brown spotted. The pathogen Alternariasp. It is a semi-known Alternaria. The conidia are transmitted by wind and rain. Prevention and treatment methods spraying 70% chlorothalonil wettable powder 1000 times liquid and other fungicides at the initial stage of the disease.
2019-01-16 -
Control of bacterial Leaf spot of Primula
Symptoms in the spring in the four seasons, leaves and receptacle disease. At the initial stage, water-immersed irregular lesions were produced along the veins, then yellowed, then browned, enlarged, and the symptoms of marginal blight occurred. In severe cases, it withered from the lower lobe. On the multi-flower primrose spring, dark water-immersed spots first appeared on the leaves, and then the disease spots became light brown, with obvious yellow halos around them. Pathogen Pseudomonassyringaepv.Primrlae (ArketGardner) Young,DyeetWink
2019-01-16 -
Anthracnose of primrose
[Pathogen] Colletotrichum primulae, a genus of fungi, belongs to the subphylum Semi-fungi, and belongs to the genus Sphaerotheca. [Symptoms] Round or nearly round brown spots appear on the leaves, and sparse small black spots are formed in the late stage, which is the conidium disk of the pathogen. [Pathogenesis rule] Disease nuclear radiation overwinters on infected leaves, conidia spread by wind and rain, and invade from wounds. [Epidemic characteristics] Higher humidity is conducive to the occurrence of diseases or to the aggravation of diseases. [Prevention and control measures
2019-01-16 -
Botrytis cinerea of Primula
Botrytis cinerea is a common disease of primroses, which occurs more commonly. [pathogen] BotrytiscinereaPersetFr. [symptoms] watery spots appeared on the leaf tip or leaf edge, and then gradually expanded to black and rotted; the stem showed irregular brown spots, which were prone to soft rot; the flowers became brown and rotted and fell off after damage. In the later stage of the disease, a grayish-brown mildew layer was formed in the disease. [incidence regularity] the pathogen overwintered in the remains of diseased plants or in soil. Conidia are transmitted by wind and rain
2019-01-16 -
How to prevent and cure primrose spot disease?
Prevention and control of primrose spot disease: first, breeding disease-resistant varieties. Second, strengthen the management of fertilizer and water, increase the application of organic fertilizer and phosphorus and potassium fertilizer, and avoid excessive application of nitrogen fertilizer. Third, after the onset of the seedling disease, start spraying 70% methyl thiophanate wettable powder 1000 times and 75% chlorothalonil wettable powder 1000 times, or 50% mixed thiophanate suspension or 36% thiophanate suspension 500 to 600 times, or 1: 1: 100 Bordeaux.
2019-01-16 -
Prevention and treatment of Primula spot
The symptoms occur on the leaves. The spot is usually 3-4 mm in diameter, brown, and in severe cases, the diseased leaves die, resulting in fallen leaves. The disease spread from the lower lobe to the upper lobe. The pathogen RamulariaprimulaeThumen is Alternaria alternata. It belongs to a subphylum of semisciferous fungi. Conidiophores protruding from stomata, several branches clustered, extremely short, unbranched, colorless, slightly curved at the end; conidia cylindrical or short rod-shaped, unicellular or bicellular, colorless, 16-24 × 3-4 microns in size. The route of transmission and the conditions of the disease
2019-01-16 -
Primula spot disease
Symptoms: mainly harmful to plant leaves. The disease spread from the lower part of the plant to the upper part. The spot is usually 3 to 4 mm in diameter, brown, and in severe cases, the diseased leaves die, resulting in fallen leaves (see figure 2). The disease is caused by Alternaria alternata. The pathogen overwintered on the diseased residue by mycelium or conidium, and the seeds could also carry bacteria, which became the source of initial infection in the second year. The disease is mainly spread by conidia in the air and Rain Water. Re-infection is frequent in the growing season. Plants are prone to disease in warm and humid weather and partial application of nitrogen fertilizer.
2019-01-16