Control of Buxus inchworm
Occurrence regularity: the larva eats leaves and occurs for three generations in Hunan. The overwintering adults Eclosion and oviposition in mid-April, then pupation in late April, Eclosion in mid-June, second generation damage in late June, pupation in early August, Eclosion in mid-August, damage to the third generation in late August. The worst victims are the first and second generations. The damage is the most serious in the mild climate and abundant rainfall season, which can gnaw off the leaves of the whole plant in 2 to 3 days, making the plant bald. In the season of sufficient rainfall, the plant can still grow leaves, such as high temperature and drought after being killed, the whole plant will die, so it is necessary to control it in time.
Prevention and control methods:
a. Turn the soil in winter and kill the pupae of overwintering insects.
b. The flying ability of overwintering adults is weak, and they are caught and killed in time during Eclosion.
c. Timely spraying and control in the early stage of larval damage
The control agents are as follows: 1000 times of trichlorfon crystal, 5000 times of chlorhexidine, 0.2 to 50 million spores / ml of Bacillus thuringiensis.
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Powdery mildew of Euonymus tomentosa
Symptoms: the disease harms leaves and shoots. Most of the disease spots were distributed on the front of the leaves. At the beginning of the disease, there are many small white round spots scattered on the susceptible leaves, which gradually expand, heal each other and become irregular spots. When the disease is serious, the infection rate of new shoots can reach 10%. White powder appeared on the whole leaf and shoot surface. The diseased leaves gradually fade green, turn yellow, and finally turn brown and black. The diseased part is deformed, the diseased leaf is shrunk, and the diseased tip is twisted and atrophied. Pathogen: pathogen is Oidiumeuonymi
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Disease condition of Euonymus tomentosa
First, symptoms: in the early stage 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 deep. There are many small black spots on the disease spot, and when the disease spot is serious, the disease spot is connected into one piece, and the leaves are withered and yellow. Second, the law of the disease: the pathogen overwintered on the diseased or fallen leaves in the form of hyphae, which was the source of primary infection. Spores are transmitted by wind and rain. As the temperature rises in the following spring, conidia are produced.
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