Control method: spray 40% dimethoate 2000 ~ 3000 times aqueous solution once a week; Or spray with 2.5% rotein 800 ~ 1000 times aqueous solution.
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③ Broad leaved trees with thick or leathery leaves, mostly shade tolerant; Broad leaved trees with thin and large leaves, mostly light loving.
They must be moved indoors or in a greenhouse in winter.
Trees with general cold resistance can be placed outdoors for overwintering without cold protection.
② Branch and stem diseases: common stem rot and ulcer disease, such as rot on the surface of the branch, rot on the stem core, spots on the branch and so on.
Some non hardy trees, such as camellia, Michelia, Fujian tea, kumquat and banyan, are potted in the north of the Yangtze River Basin.
② Red spider: it occurs when the temperature is high.
Those with dense branches and leaves are more shade tolerant, while those with open branches and leaves and sparse canopy are more light loving.
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The leaves of the injured trees shrink and droop, and the leaf surface is dirty, black, dry and fall off in serious cases.
The main points of bonsai construction are as follows: ① coniferous pine species are mostly positive trees; Some cypress species with flat or scale leaves, bamboo cypress and Luohan pine are mostly negative trees.
The drawings are from the network.
The common pests of tree bonsai are as follows: ① aphids: there are many kinds of aphids, and the damage is common.
Drugs shall be used for prevention and control in time, such as spraying Bordeaux liquid, coating with stone sulfur mixture, etc.
In addition, the thermophilic and cold tolerance of trees are also very important for the placement and management of bonsai.
The light preference and shade tolerance of tree bonsai have a great relationship with the placement place and management measures.
③ Leaf diseases: common diseases include leaf spot disease, yellowing disease, powdery mildew, etc., with yellowish brown or black spots on the leaf surface, leaf curling, withering, early defoliation and other symptoms.
In order to prevent the basin soil from freezing and cracking, it can be buried underground and the basin surface is exposed to the ground.
Bonsai trees in the South can be kept in place in winter.
Scale insects absorb tree juice and can also cause coal pollution disease, resulting in poor growth of trees, withered branches and leaves and early deciduous leaves.
Therefore, we must pay attention to the conservation of precious tree bonsai.
Control method: remove the diseased leaves and spray Bordeaux liquid; Chlorosis can be sprayed on leaves with 0.1 ~ 0.2% ferrous sulfate solution; Powdery mildew can be sprayed with lime sulfur mixture of 0.3 ~ 0.5 degree in Bomei.
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Attention should be paid to the disinfection of basin soil and the control of watering amount.
The common diseases of tree bonsai are as follows: ① root diseases: the root of old pile bonsai is aging, which is easy to produce root rot or root nodule disease caused by various bacteria and fungi.
Shade tolerant tree bonsai must be shaded in summer.
It is found that if the pest is not controlled in time, it will seriously damage the growth of trees and even lead to death.
④ Small shrubs under the wild forest, such as tiger thorn, June snow, Nantian bamboo, ten mahonias, flat wood, etc., are mostly shade tolerant; Most of the tree species originally grown in the wilderness or sunny slope, such as YINGSHANHONG, loumu, medlar, Vitex, Sparus, etc., are light loving.
The harm is quite common.
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Control method: in addition to manual brushing, it can be sprayed with 40% dimethoate EC 1000 ~ 1500 times solution or 80% dichlorvos 1000 ~ 1500 times solution.
They can not be placed casually in violation of their biological characteristics.
(5) Pest control: the pest control of tree bonsai is the same as that of ordinary potted ornamental trees.
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③ Scale insects: there are many kinds, and their feeding habits are miscellaneous.
It absorbs the juice of branches and leaves.
After the leaves are killed, they appear gray spots, and wither and fall off in serious cases.
② Evergreen broad-leaved trees, such as boxwood, holly, Phoebe, zijinniu, camellia, are mostly shade tolerant; Deciduous broad-leaved tree species, such as plum, peach, Begonia, crape myrtle, sparrow plum, pomegranate, elm and park, are mostly light loving.
Prevention and control methods; Spray with 1500 ~ 2000 times solution of 40% dimethoate emulsion or 1000 times solution of 50% iminophos wettable powder, and spray with boiled pepper water.
