Prevention and control of diseases and insect pests of tree stump bonsai
There are diseases in the branches, such as phloem, cambium decay, stem rot and ulcers on the branches, surface decay of the branches, dry core decay, spots on the branches, and so on. Bordeaux solution should usually be sprayed, Xu with stone-sulfur mixture, and scraped off the rotten parts.
Foliar diseases: foliar diseases usually appear yellow-brown or black spots, leaf curl, wilt, early defoliation and other symptoms, which may be yellowing, leaf spot, soot, powdery mildew and so on. Leaf spot disease can be removed and Bordeaux solution can be sprayed; chlorosis can be sprayed with 0.1-0.2 ferrous sulfate solution; powdery mildew can be sprayed with Baume 0.3-0.5 degree sulfur mixture.
Root disease: the root of the stump bonsai is aging, which is easy to produce root rot or nodule disease caused by various bacteria and fungi. Attention should be paid to the disinfection of potted soil and the control of watering water.
The control of scale insects: the harm of scale insects is generally various. It is a pest that absorbs tree stump tree sap, and it is easy to cause soot disease, poor growth, yellow branches and leaves, early defoliation and so on. In addition to killing with manual brushes, 40% dimethoate EC 1000-1500 times solution can be used, or 80% dichlorvos 1000-1500 times solution can be used to kill it.
Red spider treatment: red spider is to absorb leaf juice to harm the leaves, after pests, the leaves show gray spots, and cause withered yellow shedding. The control method is to spray with 40% dimethoate emulsion 1500200 times solution or 1000 times solution of 50% parathion wettable powder.
Aphid control: there are many kinds of aphids and the harm is common. The leaves of the injured stumps are generally curled and drooping, and when they are serious, the leaves are black, dry and shedding. Control method: generally spray with 40% dimethoate 2000-300O times aqueous solution, once a week. Or spray it with an aqueous solution of 2.5% 800 to 1200 fish vines.
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Main diseases and insect pests of banyan bonsai
First, soot disease. Soot disease often occurs with aphids and scale insects under the condition of high temperature and humidity. The control measures are as follows: (1) to create ventilation and light transmission conditions for plants; (2) to reduce air humidity; (3) to scrub disease spots with a brush dipped in water; (4) to eliminate aphids and shell insects in time; and (5) to protect by spraying. Spray 120 ℃ 160 times Bordeaux solution or 70% methyl thiophanate 700 times 800 times solution, or 50% carbendazim wet powder 500 times 80 every 10 to 14 days from June to August.
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Pest Control of Cymbidium (1)
The pests that harm Cymbidium include shell insects, aphids, leaf mites, thrips, whitefly, leaf miner, snails and slugs, nematodes, caterpillars, cockroaches, ants and so on. 1. The scale insect is one of the most common pests that harm Cymbidium. There are many kinds of them, which are mainly parasitic on the stems and leaves of Cymbidium, and can also be found on the membranous sheaths at the base of petioles and pseudobulbs. They feed on piercing mouthparts sucking plant juice. When the damage is mild, the organ turns yellow and aging, affecting the growth of orchid plants, and the heavy ones cover the leaves, which not only consumes nutrients, but also affects orchids.
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