Ring disease of geranium
Geranium ring disease is a common leaf disease of geranium. It has a wide host range and can damage a variety of woody and herbaceous flowers, seriously affecting ornamental plants.
Symptoms: at the initial stage of the disease, green spots appear on the susceptible leaves, and then the spots gradually expand, forming a larger round spot. The disease spot is dark brown and has concentric rings. In the later stage of the disease, a black-green mold layer appeared on the disease spot, which was the conidia of the pathogen.
Pathogen: the pathogen is Alternaria (AlternariatennuisNees), which belongs to the subphylum Trichospora, Alternaria.
The regularity of the disease: the pathogen overwintered with mycelium in the diseased tissue, produced conidia when the environmental conditions were suitable, and the conidia were infected by wind and rain. During the growing season, conidia can repeatedly infect plants.
Prevention and treatment: ① reduces the source of infection: diseased leaves are cut off in time, together with concentrated destruction of diseased leaves. ② medicament prevention and cure: at the initial stage of the disease, spray 1-100 Bordeaux solution, or 50% bacilli wettable powder, or 65% Dysen zinc wettable powder 600-800 times, once every 10-15 days, 2-3 times.
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Monthly management of geranium
Families and genera: Bovidae, Pelargonium. Scientific name: Pelargoniumhortorum. Aliases: Hydrangea, foreign butterfly, paraffin red. Habits: pelargonium, native to southern Africa, is a perennial herb with a sexual preference for a warm and humid environment. It is not resistant to cold and summer heat. The suitable temperature for growth is 13-19 ℃ from March to September and 10-12 ℃ in winter. Like plenty of sunshine, afraid of sun exposure in summer, suitable for semi-overcast environment. It is slightly resistant to dryness for fear of wet water. Require fertile, loose, well-drained soil. January: Fangyang
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Leaf roll disease of geranium
Geranium leaf curl disease, also known as geranium wrinkle disease, is a viral disease and is only found in Shanghai. Symptoms: the leaves of susceptible plants curled downward and atrophied. When the disease is serious, the plant necrosis. Pathogen: the pathogen is geranium leaf roll virus (PLCV). Disease regularity: the virus is transmitted by juice, grafting and soil, and no vector insects have been found. The symptoms of the disease are not obvious in summer and autumn, and the virus can be transmitted from the remains of the virus-carrying plants pruned.
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