ã€symptom】
Occurred mainly on the leaves, many pathogens invaded from the tip or leaf margin, the first stem and leaf disease, the diseased leaves appeared round or near round lesions, light brown, brown edges, sparse round veins, diameter 5mm- 15mm; in the event of leaf margins, it is irregularly shaped, brown or grayish-white, with brown edges, concentric ring veins, irregular spots formed after healing of several lesions, causing the leaves to wither; later many small black spots are generated and buried. Born under the epidermis.
ã€pathogen】
The pathogens were fungi, Phyllostictagar-deniicola, P. gardenia, Deuteromycotina, Coriolus, and Sphaeropsis. Conidia spheroids, the former larger; conidia oval, oval. The black spot on the lesion is the conidia of the pathogen.
[control methods]
1. In the fall and winter seasons, the leaves should be cleaned in a timely manner and destroyed centrally to reduce the source of infection. Planting should not be overly dense, and proper trimming should be carried out to facilitate ventilation and light transmission. Pay attention to pruning wounds and apply anti-corrosion film to anti-corrosion rot bacteria to promote rapid wound healing.
2, rational watering, fertilization, and spray a new high-fat membrane protection and fertilizer. When watering, do not wet the leaves as much as possible, preferably on a sunny morning. Sprinkle the flower Zhuang Liling immediately after flowering, which can promote the strong buds, petals hypertrophy, bright colors, rich flowers, and prolonged flowering.
3, do a good job monitoring, early onset with the appropriate amount of thiophanate-methyl WP plus a new high-fat membrane for prevention and treatment. Spray once every 10 days. When the disease is severe, spraying 65% of dexamethasone 600-800 times liquid and spraying new high fat film can be sprayed to control the spread and expansion of the disease.
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