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Symptom Identification and Control Methods for Leaf Spot Disease on Japanese Spindle (Euonymus japonicus)
Symptoms: The disease affects the young and old leaves of Japanese spindle (Euonymus japonicus). Yellow-brown spots appear on the upper surface of the leaves and expand into nearly circular or irregular shapes, 4 mm to 14 mm in diameter, with a grayish-white center, light brown concentric rings, and a dark brown slightly raised edge. Dense tiny black mold dots form within the lesions. The spots show through to the underside, though the color on the underside is slightly lighter than on the upper surface. After the lesions dry up, they crack apart from the healthy tissue, eventually forming holes. This often causes early leaf drop. Pathogen: fungus, Cercospora destructiva Rav. of the order Moniliales, class Hyphomycetes, subdivision Deuteromycotina.
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Causes and Control Methods of Euonymus japonicus Wilt Disease
Euonymus japonicus wilt disease is a common disease of Euonymus japonicus in recent years. It is characterized by sudden onset, rapid spread, and a major impact on landscaping effects. Although this disease is stubborn, if correct measures are taken, targeting the pathogen and applying multiple measures at once, satisfactory control results can still be achieved. Symptoms: In affected Euonymus japonicus, at first only the upper leaves of individual branches turn green-dry and lose water, then the entire branch and the whole plant's leaves and branches show a green-wilted, water-loss appearance. In the late stage of the disease, the leaves turn yellowish-white, and severe infection can lead to plant
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Identification and Control Methods for the Black Locust Aphid
The black locust aphid damages many leguminous plants such as black locust, Chinese scholar tree, and false indigo. Adults and nymphs gather on new black locust shoots to suck sap, causing new shoots to bend, young leaves to curl, and branches to stop growing, while their secretions often cause sooty mold. The wingless aphid is about 2 mm long, oval, pitch-black and glossy, with distinct hexagonal reticulation on the dorsum of the head, thorax, and abdominal segments 1-6; abdominal segments 7 and 8 have transverse striae; the winged aphid is long-oval, black and smooth, with grayish-white, transparent wings. The black locust aphid has more than 20 generations per year. Mainly
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Biological Characteristics and Control Methods of the Black-spotted Looper Moth on Black Locust
Black-spotted looper moth on black locust. It belongs to the family Geometridae, order Lepidoptera, and is also known as the black locust looper. It is distributed in the black locust forest areas of the old course of the Yellow River in Anyang, Puyang, Xinxiang and Kaifeng cities of Henan Province, mainly damaging black locust (Robinia pseudoacacia), and in outbreak years it can also damage jujube trees and crops. This insect is voracious, and in a short time it can eat all the leaves of entire branches and entire trees. In hot and dry years, it can strip the leaves bare 2 to 3 times a year, causing the upper parts of the trees to die and new shoots to sprout from the middle and lower parts of the trunk, causing serious harm to tree growth. Control methods: (1) Establish
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Causes and Control Methods of Twisted Mushrooms
The main symptom of twisted mushrooms is that the stipe elongates in a spiral shape, and when broken open, the stipe changes from cylindrical to flat and strip-like; growers call them "fried dough twist mushrooms." Although they are edible, they do not meet canning standards. Twisted mushrooms usually occur only sporadically within mushroom clusters. Apart from being related to the cultivated variety, the causes include weak development of young mushrooms, overly dense mushroom clusters, insufficient growing space, and constantly changing light direction, all of which can cause excessive twisting of the stipe. The prevention method is to thin out the cultivation bags and not casually move bags (bottles) that have already produced fruiting bodies.
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Causes and Control Methods of Mushroom Bud and Young Mushroom Death
1. Excessive temperature. When mushroom buds form and grow, if the temperature in the mushroom shed (room) suddenly rises or stays above 20°C for several consecutive days, combined with poor ventilation, the mushroom buds will shrivel, turn yellow, and eventually die. This situation often occurs in late autumn or early spring. Because the mushroom buds form under low-temperature conditions, their nutrients are transported from the mycelium to the fruiting body. When the temperature suddenly rises, the nutrients flow back from the fruiting body to the mycelium, and the mushroom buds die from lack of nutrients. Control methods: Pay close attention to temperature changes, and adjust
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Causes and Control Methods of Hollow Stems with White Cores in Mushrooms
Symptoms: The mushroom stem tissue is not solid, with a white, loose pith appearing inside; after the fruiting body dries or is cooked, the pith shrinks or falls away, becoming hollow. Causes: This is mainly due to improper water management. If the air humidity in the mushroom house is low and the soil layer humidity is low, especially when the water content of the coarse soil layer is insufficient, the rapidly growing fruiting bodies cannot obtain sufficient water from the soil layer, and consequently the transport and supply of nutrients are also reduced. Combined with the continuous evaporation of water from the fruiting bodies themselves, this causes a lack of water in the middle of the stem and loose tissue, thereby
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What are the main pest and disease control methods for mushroom sheds?
1. Mushroom flies: The larvae, also called fungus maggots, mainly feed on the fruiting bodies, boring tunnels that affect quality, and the wounds they create are very easily infected by pathogens, causing rot. Different methods should be used to control mushroom flies at different stages. If large numbers of fungus maggots appear before mushroom emergence, you can fumigate with dichlorvos at a rate of 0.90 kg per 100 sq m, and at the same time spray each culture block with another 0.15 kg of 1% potassium chloride or sodium chloride solution (5% salt water can be used as a substitute); if fungus maggots cause damage after mushroom emergence, you can spray low-toxicity pesticides such as derris extract, permethrin, and nicotine. (Nicotine
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Symptoms and control methods of pinellia virus disease
It mostly occurs in summer; infected leaves curl and twist, and the plants grow stunted. Control methods: ① Select disease-free plants for seed. ② Disinfect the soil before sowing and control pests promptly. ③ When diseased plants are found, pull them out immediately, burn them in a centralized pile and bury them deep, and pour 5% lime milk into the diseased planting holes.
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Symptoms, Identification and Control Methods of Pinellia Leaf Spot
It occurs in early summer. Purple-brown spots appear on diseased leaves, and later many small black dots form on the lesions. In severe cases, the lesions cover the entire leaf, causing the leaves to curl, scorch and die. Control methods: In the early stage of the disease, spray 1:1:120 Bordeaux mixture or 65% zineb 500-fold solution, once every 7-10 days, for 2-3 consecutive applications.
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