When the powdery mildew was onset, a white powdery substance appeared on the surface of leaves, shoots and flower buds. The diseased plants are short, not robust, with uneven or curly leaves, malformed shoots, atrophy of flower buds, and inability to flower or develop malformed flowers. In severe cases, the leaves are shriveled and dry, which seriously affects plant growth and results in the death of the whole plant. The cause of the disease was caused by excessive wetness in the basin soil, excessive nitrogen fertilizer, and long shading time. Control methods: Attention should be paid to ventilation, humidity control, cutting off diseased leaves, concentrated burning, and when the dew is not dry, spray a small amount of sulfur powder or 0.1-0.3 Baume degree lime sulfur, which can play a preventive role.
After the root rot has been planted in pots from the field excavation piles, the disease often occurs. Most of them were rotted due to poor transplanting, as well as the infection of the wounds with bacteria, excessive watering, soil stains, poor ventilation, and root suffocation. Excessive fertilization can also cause rot. After the root rots, the absorption function is hindered, resulting in shoots falling from the ground. Control methods: carefully dig up the original plant, trim the root rot, then plant the plant with new soil, change the growing conditions of the pile, increase the light, loosen the soil, and properly control the water and fertilizer to promote recovery.
In the early stage of leaf mold development, round purple-brown spots appear on the leaves and are gradually enlarged. The center is pale yellow-brown and the edges are purple-brown. There are obvious concentric ring patterns on the lesions. In autumn, the lesions turned dark brown, crunchy, and easily cracked, with dark green moldy textures. In severe cases, lesions often spread from the lower part of the plant to the entire leaf, causing a large amount of leaf coke, affecting growth and flowering in the second year. Causes of morbidity are mostly due to poor management, such as high humidity or multiple occurrence of the disease after the plants are frozen. Control methods: mainly to strengthen management, pay attention to pruning, keep plants airy and transparent, keep the soil dry. Clean up diseased leaves and dead branches and burn them in a concentrated manner. It can also be sprayed once a week in the early spring and early autumn Bordeaux mixture 120-160 times or 65% zein zinc WP 500-600 times.
Tianniu Tianniu occurs in 1-2 years, and larvae live in winter in the trunk. The newly hatched young hovering under the bark hovering for food, and then into the trunk, roots, and then in it. Adults have emerged in late May and feed on treetops and young leaves. Damaged potted trees often cause death. Control methods: kill adult worms and knock eggs. Kill the available steel wire that has fallen into the wood, or use a dilemma wet cotton ball to block the hole, close the hole with a yellow paste, or add 5-10 times more water to the larvae. You can cut off the damaged branches and burn them immediately.
Common scale insects are blown cotton scale insects and shield scale insects. The scale insects mainly suck the plant sap with their sucking mouthparts, which makes the plant grow poorly and even the whole plant withers. The excreted secretions block the leaf stomata, which often causes soot. Control methods: In the early stage of larvae hatching, spray with dichlorvos 800-1500 times, or use a brush to remove the insects. In addition, it should be properly trimmed to provide light and ventilation. aphid. Aphids are highly fertile and can reproduce 10-30 generations a year. The locust swarms on young shoots and sucks the sap of the plant with a sucking mouthpiece, causing the young shoots to shrink, curling the young leaves, producing knobs, and inducing ants and infecting other diseases. Control methods: Spray with Leko-emulsion 1000-2000 times or Dichlorvos 1500-2000 times. Eucalyptus, arborvitae, pomegranate, etc. are sensitive to dimethoate. After spraying, they will fall into the fallen leaves. They can be sprayed with 1,000 times liquid of fish rattan.
Red spiders reproduce rapidly under high temperature and dry conditions. Almost all potted trees are vulnerable. It likes to make nets on the plants and sucks juice under the net, so that the yellow leaves of the victims are declining, affecting the growth of the trees, and some of them even die of the whole plant. Control methods: Spray with dimethoate or dichlorvos 1500-2000 times, while also paying attention to increase air humidity.
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