Leaf spot of Euonymus tomentosa
The symptom is harmful to the young and old leaves of Euonymus tomentosa, with yellow-brown spots on the front, expanding into nearly round or irregular shape, 4mm~14mm in diameter, gray-white in the center, light brown concentric lines, dark brown margin slightly raised, and dense small black mildew spots in the disease spot. The spot passes through the back, but the color on the back is slightly lighter than that on the front. After the disease spot dried up, it split with the healthy part until the perforation was formed. Often cause early defoliation.
Pathogenic fungus, Cercospora cercosporadestructivarav.
The pathogen overwintered in the diseased leaves on the tree and on the ground, produced conidia in spring for initial infection, and then produced a large number of conidia for multiple re-infection in the whole growing season. When it is rainy, wet, frozen in spring or the plants are too dense and poorly ventilated, the disease is often serious, resulting in fallen leaves.
Prevention and cure method
Do a good job in the sanitation of green land, clean up diseased and fallen leaves in winter and spring, and concentrate on burning.
At the initial stage of the disease, the patients were sprayed with 1, 2, 200 Bordeaux solution or 1000 times of methyl thiophanate wettable powder or 65% zinc wettable powder, and then sprayed again for 1 time or 3 times according to the condition.
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Treatment of Leaf spot of Euonymus tomentosa
Euonymus tomentosa is a small evergreen shrub commonly used in gardens, which has many advantages, but the occurrence of leaf spot will cause early defoliation, bald branches and even death, which seriously affect the normal growth and ornamental effect of Euonymus tomentosa. Symptoms of leaf spot disease: at the beginning of the disease, there are small yellow spots on the leaves, which gradually become yellowish brown and enlarge into round or irregular spots with a diameter of 2 mm to 10 mm. The disease spot is grayish brown or grayish white in the later stage, and the edge is dark. There are many small black spots on the disease spot.
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Morphological characteristics of Euonymus tomentosa
Evergreen shrubs or small trees, to 5 m tall; branchlets subquadrangular. Leaf blade leathery, surface glossy, Obovate or narrowly elliptic, 3mur6cm long, 2MUE 3cm wide, apex pointed or obtuse, base cuneate, margin serrulate; petiole ca. 6mur12 mm. Flowers green-white, 4-numbered, 5-Mel 12 arranged in dense Cymes, axillary. Capsule subglobose, with 4 shallow grooves, ca. 1 cm in diam.; seeds brown, aril orange-red. The flowering period is from June to July, and the fruit ripening period is from September to October.
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