Control methods of privet inchworm in garden ornamental trees
Distribution and damage of privet inchworm NaxaseriariaMotschulsky, also known as lilac inchworm. It belongs to Lepidoptera, Geometridae. Distributed in Northeast, North China, Northwest, Southwest and East China. The larvae are martyr, Beijing clove, weeping clove, lilac, Liaodong clove, white clove, privet, big leaf privet, sweet-scented osmanthus, camellia, tea, water wax, Fraxinus mandshurica and Fraxinus mandshurica. The larvae gather to feed on the leaves, often nibbling away at the leaves. The larvae have the habit of spinning and netting, and when they are serious, they cover the tree crown, resulting in the death of trees and affecting the effect of greening and beautification.
The morphological characteristics of the adult are about 14 mm in length and 38 mm in wingspan. Body wings white, slightly gray and metallic luster. There are two rows of black spots on the outer edge of the wing, and there are large black spots on the front and rear wings. The egg is yellowish and oval. When mature, the larvae are about 20 mm long, with black head shell, yellow soil and irregular black spots on the body. The pupa is yellowish with black spots.
Living habits occur one generation a year in Northeast and North China, overwintering as larvae in the soil. In June, the adults began to Eclosion, and the adults had phototaxis. The larvae are 8 instar. The larvae spin silk and form a net on the canopy, and when the leaves in the net eat light, they transfer the damage, forming the net first and then feeding. In September, the elder larvae went down to the tree to survive the winter. Two generations a year occur in East and Southwest China, overwintering as larvae on branches. The damage continued in the following spring, pupating in May, Eclosion of the first generation of adults in June, and emergence of the second generation of adults in August.
Integrated prevention and cure
The main results are as follows: (1) when the elimination of insect pests is serious, the pupae are dug manually in late autumn or early spring to eliminate the insect source.
(2) due to the long occurrence period of adults, the effect of trapping and killing adults with black light is better.
(3) when the chemical control is serious, spray 4000 times solution of 10% Anlubao EC or 25% Aktai water dispersible granule in time to reduce the insect population density and avoid causing great harm.
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Cultivation techniques of Metasequoia glyptostroboides
Metasequoia glyptostroboides (Metasequoiaglyptostroboides), alias Metasequoia glyptostroboides, Taxodiaceae. First, overview: is an ancient and rare tree species, known as "living fossils", for the national key protection of plants. In 1941, Chinese botanists first discovered it in Wanxian, Sichuan and Lichuan, Hubei, which caused a shock in the botanical circle of the world. Second, ecological characteristics: originating from China. Like a warm, humid and sunny environment. Strong adaptability, cold tolerance, shade tolerance, moisture tolerance, drought tolerance and drought tolerance
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Brief explanation of Seedling raising technique of lobular Ligustrum lucidum
Lobular Ligustrum lucidum belongs to Oleaceae, Ligustrum lucidum, evergreen or semi-evergreen shrubs. Also known as small leaf holly, small ash tree. It is a hedge material in the garden, and can be used as the rootstock of sweet-scented osmanthus, cloves and other trees. Strong sex, cold tolerance; strong root tillering; resistance to pruning. It can be propagated by sowing, cutting and ramet, but mainly by sowing. First, sowing seedlings from October to November, when the drupe is purple-black, it can be harvested and sowed immediately after harvest, or it can be dried and stored until March of the following year. Soak the seeds in warm water for 2 days before sowing, and sow the seeds after soaking. Mining
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