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Identification and Control Methods for the Great Spruce Bark Beetle
The great spruce bark beetle [Dendroctonus micans (Kugelann)] belongs to the order Coleoptera, family Scolytidae. It is mainly distributed in Austria, Belgium, Czech Republic, Slovakia, Denmark, Finland, France and other countries. In China, it has been found in the Makehe forest area of Qinghai Province. It mainly damages some species of Picea (spruce), and occasionally some species of Pinus (pine) and Abies (fir), as well as European larch and Douglas fir. Damage characteristics: adults and larvae attack weakened trees and dead standing trees; during outbreaks, they can attack healthy trees, severely disrupting the trees' transport function,
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Identification and Control Methods of the Spruce Sawyer Beetle
The spruce sawyer beetle (Monochamus urussovi Fisher), also known as the spruce black longhorn beetle, belongs to the order Coleoptera, family Cerambycidae. In China it is distributed in the Northeast, Inner Mongolia, Hebei, Shandong, Jiangsu, Shaanxi and other places. It mainly damages Picea koraiensis (Korean spruce), Picea jezoensis (Jezo spruce), Abies nephrolepis (Khingan fir) and others, and is a major pest of coniferous timber in northern China. Damage characteristics: the larvae damage felled trees, weakened standing trees, wind-thrown trees and logs in timber yards, forming thick galleries; the adults gnaw the tender bark of small branches of living trees. Morphological characteristics: adult body length 21-33
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The Harm and Control Methods of the Spruce Bark Beetle
The spruce bark beetle (Ips typographus Linnaeus) belongs to the order Coleoptera, family Scolytidae. In China it is distributed in Northeast China, Inner Mongolia, Sichuan, ** and other places, mainly damaging spruce and Korean pine, and is a destructive pest in some spruce forest areas. Damage characteristics: it bores galleries between the phloem and sapwood of pine trees, and the galleries are compound longitudinal galleries. It can also directly attack healthy trees, and often occurs together with other bark beetles, causing trees to die in patches. Morphological characteristics: adult body length 4.0-5.5 mm,
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What are the main pests and diseases of dawn redwood (Metasequoia glyptostroboides)? A full analysis of control methods
Damping-off (seedling blight): after leaf fall in autumn, promptly clear away and dispose of fallen leaves, then spray the ground with 3-5Be lime-sulfur mixture. Dawn redwood red blight: immediately after the plum rain season ends, spray the canopy with 1% Bordeaux mixture 4-5 times, once every 10-15 days, to control the occurrence of the disease. Tortricid moths: the best control period is the early stage of damage when the larvae emerge from overwintering (early to mid-April); 50% fenitrothion, 40% dimethoate, 80% dichlorvos and pyrethroid insecticides can be used; in dry seasons (July and August) when outbreaks occur
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Occurrence Characteristics and Control Methods of Mushroom Gall Midge
I. Morphological Characteristics The gall midge, also known as the small red maggot or mushroom gnat, has adults that resemble small mosquitoes, tiny and delicate, difficult to see with the naked eye. The head, thorax, and dorsal side of the body are dark brown, while the rest is grayish-brown or light orange. Larvae can hatch from eggs or be reproduced by the mother's larvae. Each female can produce an average of more than 20 larvae. In the early stage, larvae cause damage in the substrate, resulting in sparse and weak mycelium. In the later stage, they move to the mycelium and fruiting bodies. When fruiting bodies are damaged, they first breed at the base of the mushroom stipe, then climb to the junction between the stipe and the cap, and some bore into the gills, which are eaten into scars and trails, appearing light orange-red. A single mushroom can host 20 to 30 larvae in severe cases, seriously affecting the quality and yield of mushrooms.
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What are the control methods for mushroom gall midges?
I. Causes (1) Improper composting of the growing substrate. The substrate is not fully fermented, the turning of the pile is uneven, the fermentation time is too short, and disinfection is not thorough. (2) Unsuitable microclimate inside the mushroom house, such as humidity being too high. (3) Poor cultivation conditions. Growers use old mushroom racks to cultivate mushrooms and do not disinfect thoroughly after harvesting. The water source is not clean and carries diseases, pests, and contaminant microorganisms. The mushroom house has poor ventilation. II. Control methods (1) Site selection and mushroom house disinfection. The mushroom production site must be chosen in a place with dry terrain, close to a clean water source.
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What are the control methods for powdery mildew on Schisandra chinensis?
1. Disease symptoms: Powdery mildew damages the leaves, fruits and new shoots of Schisandra chinensis, with young leaves and young fruits suffering the most severe damage. It often causes leaves to dry up, new shoots to die back and fruits to drop. In the early stage of leaf infection, needle-like spots appear on the underside of the leaves, gradually covered with a layer of white powdery substance, and in severe cases it spreads to the entire leaf. Diseased leaves turn from green to yellow, curl upward, wither and drop. Young fruit infection starts near the rachis, and in severe cases gradually spreads outward to the entire fruit cluster; diseased fruits become wilted and drop, and dark brown spots appear on the fruit stalk and new shoots. In the late stage of the disease,
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What are the control methods for schisandra phytotoxicity?
In recent years, phytotoxicity from pesticides has frequently occurred in the large numbers of schisandra plants cultivated across various regions. In mild cases it reduces yield, and in severe cases it causes total crop failure and no harvest for the entire orchard, so sufficient attention should be paid to it. The common acute phytotoxicity in schisandra is mainly caused by improper pesticide application and pesticide drift. Phytotoxicity in schisandra caused by pesticide drift is mainly the result of using the 2,4-D butyl ester herbicide in corn fields and wheat fields. Wu Zhongsheng of Xiagou Village, Wangshi Town, Haicheng City, planted 100 mu of schisandra and once suffered phytotoxicity from 2,4-D butyl ester drift, resulting in total crop failure and no harvest for the entire orchard that year. Schisandra is highly sensitive to the herbicide 2,4
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What are the control methods for root rot in Schisandra chinensis?
Root rot in Schisandra chinensis, commonly known as "rotten neck" disease or "strangle neck" disease, is one of the main diseases in Schisandra chinensis cultivation. At present, the affected area is relatively widespread and the damage is relatively severe. The disease generally occurs from May to early August. When the disease begins, the epidermis at the junction of the root and the ground (the root crown area) turns black, and further the cortex rots and falls off, forming a ring, the leaves wilt, and after a few days the entire plant dies. The cause of the disease is related to a physiological disorder. In early spring and late autumn, the ground temperature changes drastically between day and night, with a large temperature difference; the tissue at the root crown area is tender, disease resistance is reduced, and the cortex is damaged by freezing and infected by fungi, all of which can cause rot and disease. Waterlogged, low-lying land and relatively heavy clay soil have severe disease incidence, and plants that are not robust in growth and have poor vine maturity have more severe disease incidence.
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Control Methods and Technical Key Points for Cotton "Double Rot" Disease
Rotten bolls and rotten peaches are common, frequently occurring diseases of cotton that seriously affect cotton yield and quality. People customarily call these two diseases "double rot disease." (1) Causes 1. Excessive or too-late application of nitrogen fertilizer causes excessive cotton growth and a closed, shaded field, which weakens the disease resistance of cotton plants. 2. During the flowering and boll stage, cotton encounters heavy rainstorms or excessive autumn rain, field humidity is too high, and drainage is poor, causing pathogens to breed and invade. 3. Cotton is attacked by red rot, anthracnose, boll blight, and other diseases. (2
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