How to prevent stumps, bonsai pests and diseases?

Diseases on the branches: manifested in the stem phloem, forming layers rot, stem rot and ulcers appear on branches, rotted branches, dry heart decay, spots on the shoots, etc., usually should be sprayed Bordeaux mixture, Xu Zhiyi Lithosulfide mixture, and scraped off the rot in the local and so on. Foliar diseases: Foliar diseases usually appear yellow brown or black spots, leaf curling, withered, early deciduous and other symptoms, may be yellowing, leaf spot, sooty, powdery mildew and so on. Leaf spot can be removed leaves, spray Bordeaux mixture; yellowing can be used 0.1 ~ 0.2 ferrous sulfate solution sprayed foliar; powdery mildew available Baume 0.3 ~ 0.5 degrees sulfur mixture spray.

Root diseases: The bonsai roots of tree stumps are aging, and it is easy to produce root rot or root nodule disease caused by various bacteria and fungi. Attention should be paid to the disinfection of potted soil and the control of watering volume.

Scale insects control: scale insect harm is widespread and numerous. It is a pest that absorbs the sap of the stump. After the damage, the stump is liable to cause soot disease, such as poor growth, yellow leaves and branches, and early falling leaves. The control method is to use 40% of Dimethoate EC 1000-150O times solution, or to spray it with 80% dichlorvos 1000-1500 times solution, in addition to artificial brushing and killing.

Red spider management: Red spider is to harm the leaves by sucking leaves and leaf juice. After pests, the leaves are gray-spotted and cause yellowish shedding. Control method is to use 4O% Lemo emulsion 1500 ~ 200O times solution or 50% viscovital wettable powder 1000 times solution to kill

Locust management: There are many kinds of locusts and the harm is widespread. Generally, the damaged stumps are curled and drooped. In severe cases, the leaf surface is black, dry and falling off. Control methods: generally use 4O% dimethoate 2000 ~ 300O times aqueous solution spray, once a week. Or use the fish rattan 2.5% 800 ~ 1200 by aqueous solution spray.

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