Brown spot of Euonymus tomentosa
Symptoms: yellow or brown dots are produced on the new leaves, which gradually expand into near-round irregular spots with a diameter of up to 3Mel 10mm. After the disease spot becomes grayish brown or grayish white, the edge color is darker, there are wheel lines and many black mildew spots on the disease spot.
Pathogen and pathogenesis: fungi. CercosporadestructiuaRav. Is a half-known bacterium. The disease began to occur in the middle and late May, reached its peak in August, and basically stopped after November. Extensive management, rainy, poor ventilation and light transmission, cold weather in spring, hot summer, lack of fertilizer and water, diseases are easy to occur.
Prevention and control methods: (1) timely removal of diseased leaves. (2) spray 1% equal dose Bordeaux liquid, 50% carbendazim 500x solution, or 1500 times chlorothalonil wettable powder in the onset season, with an interval of 10ml for 15 days.
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What is the symptom of big leaf yellow poplar gray spot disease?
Symptoms of gray spot of Populus tomentosa: occurs on the leaves of Populus tomentosa. The small chlorotic macula appeared on the infected leaves at the initial stage, and then gradually expanded into irregular spots, showing gray, grayish white or irrigated yellow. The boundary between the sick and the healthy is often brown or dark brown everywhere, and the edges are often raised. In the later stage, several disease spots are often linked together, accounting for 1/2 to 1/3 of the total leaf area. when the damage is serious, the diseased leaves can fall off in the same year and even cause the branches to die.
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Propagation method of Euonymus tomentosa
Cuttage propagation is commonly used, and cuttings take root quickly in Meiyu season. Select semi-lignified mature branches, 12-15 cm long, insert into the seedbed of sand and soil, and take root 20-25 days after insertion. Cutting can be carried out in spring or summer, and the rooting of semi-mature twigs is faster and grows better in the rainy season in June. It is necessary to set up a shed for shade at the initial stage after insertion to keep the seedbed moist. The growth rate of cutting seedlings is much faster than that of sowing seedlings. Euonymus tomentosa is usually cultivated into a spherical crown and then planted.
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