What are the symptoms of euonymus leaf spot disease?
Symptoms of leaf spot disease of Populus tomentosa: the disease occurs on the new leaves to produce small yellow spots, and then expand into irregular spots, up to 1.5 mm. The edge of the spot is raised, the brown edge is wide, and there is an extended yellow halo outside the edge of the bulge. The center is yellowish brown or taupe, covered with black dots. That is, the daughter of the pathogen, under the magnifying glass, the dot is black and fluffy. In severe cases, the leaves fall off in the same year.
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Control of Stenocarpus euonymus
Euonymus chinensis is a tree species with more seedlings for greening. In recent years, Euonymus sinensis was found to have died sporadically in Nantong area and gradually developed into pieces of death. Broken dead tree from root neck and found worm-eaten tunnel. After observation, this is the harm of narrow gilead insect. Euonymus stenocarpus genus Coleoptera stenocarpus family. The insect feeds on the stem of Populus davidiana L. by larvae, causing the plant to grow weakly until it dies. I. Morphological characteristics Adult: body length 5-7 mm, compact structure, head chest
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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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