The gold leaf privet is a semi-evergreen shrub of the genus Ligustrum lucidum. Because of its tender shoots, pruning and drought resistance, it is often decorated with safflower beech, rhododendron, cypress, and other flower beds and green belts. Often due to the use of high-density planting to make pests heavier, resulting in a little new growth is slow or no new branches, grow weak and even die. The pests common to Golden Ligustrum lucidum are: Konzeria philippinarum, Ligustrum lucidum leafhopper, and yellow ringworm barnyard grasshopper.
1 Cornell mealworms
Adults and nymphs lie on the stems and leaves of the privet tree of the golden leaf. They suck the plant sap with sucking and sucking mouthparts, resulting in dehydration, wilting and even death of branches and leaves, and can also induce coal pollution.
1.1 Morphological features
The adult body is oval in shape, pink, and white wax powder on the body surface; the nymph is oval, flat, yellowish, and the body surface is covered with white wax powder; the egg is oval-shaped, light yellow, and the oocyst is white cotton-wool.
1.2 Life History and Habits
Conrad Melanopteri occurs in the Dingshan area for 3 generations in 1 year, and the egg overwinters in the host's trunk gaps, cut-offs, under the skin or in the weeds, clods, and fallen leaves around the roots. The hatching began in early May of the following year. The hatching of the third generation was in mid-late and late May, late July and late August, and there was a small peak of harm in September. After that, the female adults laid eggs in winter.
1.3 Prevention measures
1.3.1 Change the environment to increase the tree potential Change or create environmental conditions that are not conducive to the occurrence of whiteflies and reduce or reduce the damage of whiteflies. Plant-intensive gold leaf privet is susceptible to whiteflies, reasonably determines planting density, provides good ventilation and drainage, strengthens fertilizer and water management, and enhances tree vigor and plant natural resistance to insects.
1.3.2 Reduce pests in combination with pruning, pruning and burning severe bugs to reduce the source of insects and reduce hazards.
1.3.3 Chemical control During the first generation of mealworms hatching, proper spraying of pesticides can greatly reduce the annual pests. The commonly used chemical agents are: 40% omethoate 1000 times solution, osmium 1000 times solution, even when the harm is severe, even spraying Pens is excellent.
1.3.4 The natural enemies of the natural enemies Conradia citrifolia have grasshoppers and many kinds of ladybugs, and they should pay attention to protection and utilization.
2 Privet Leaves Jumping
The main damage is the leaves of the golden leaf Ligustrum lucidum. Adults feed on the leaves, resulting in round or irregular shaped spots on the leaves. The larvae submerge into the skin, drill the benthic worms under the epidermis, destroy the chloroplast structure, weaken the photosynthesis, and make a large number of leaves. Scorching and affecting the effect of green landscape.
2.1 Morphological characteristics
Ligustrum latissimus leaf adults are oval or round, black, with metallic luster on the back, and the center of the wing sheath has an oval red patch; the larvae are pale yellow, and the body is slightly short and flat, and the abdomen has 1 to 8 sections on both sides. Nodule.
2.2 Life and habits
In the 1st and 3rd generation of Pingdingshan area, mature larvae are used for wintering in soil layers, and adults emerge in late April. From May to mid-June, 1 generation, from late June to late 1st generation, and from late August to September. Generation 3 larvae appear.
2.3 Prevention measures
2.3.1 Physical control In the early winter, lichens and mosses on the trunk are removed, trunk gaps are blocked, and overwintering sites are reduced. During the spring shoot growth period, the insect leaves are removed, new leaves are removed, burned in a concentrated manner, and the larvae are exterminated before the soil is removed.
2.3.2 Chemical control Spray can be sprayed with Lexan 1000 times liquid plus penetrant, or avermectin 2000 times or 40% omethoate 8000 times.
3 Yellow Rings Wilderness
Feeding the host leaf meat with larvae falling leaves, leaving the epidermis tissue, with the characteristics of the occurrence of concentration, a large number of insect population, gluttony. From May to June, the larvae of the larvae were seriously damaged. The heavily damaged eucalyptus hedgehogs were yellowed, branches were dry, and the leaves were dark, which seriously affected the growth and greening effects.
3.1 Morphological characteristics
The head of the adult is white, the forehead is yellow scales, the base of the tentacles is yellow-white, and the rest are white; the first part of the white beak is white and the others are brown; the neck piece is brown, the body and the wings are milky white, with silky luster, and the front edge of the forewing has yellow broadband. There are 3 yellowish spots on the tape from the fin base to the end of the middle chamber. The mature larvae were yellowish-green, brownish-brown, mouthparts brown, and black spots on each side of the back of the chest and on the top of the 8th abdomen. Small spots are prismatic or scalloped. The early period of the beak is green, it becomes green-brown after half a day, becomes yellow-brown when it is near feathered, compound eyes are dark brown, and the markings on the wings are clearly visible. Eight hips were absent from the abdomen, and the tip of the breech was slightly curled and arranged in an arc. Oval oval-shaped, yellowish green when the first production, turned into a dark brown near hatching.
3.2 Habits
The worm had three generations in one year in Hengyang, Hunan province, and it was wintering in the soil near the host. The wintering pupa began eclosion and spawning in late April. The first generation larvae hatched at the end of April; the second generation larvae hatched at the beginning of June; the third generation (overwintering) larvae appeared in early July and began to plough into the soil in mid-July.
3.3 control methods
3.3.1 In late April, adult overwintering period, with 50% phoxim EC 1000 ~ 1200 times spraying foliage and branches; in early May, spraying 40% omethoate EC 1000 ~ 1200 times foliar Control larvae, control effect of more than 98%; in late May, with 2.5% deltamethrin EC 2500 ~ 3000 times spraying foliage and shoots, prevention and control of the first generation of adults; early June with 40% omethoate EC 1000 ~ 1200 times liquid spraying foliar, can control the pest damage.
3.3.2 In late April to early May and late May to early June, timely trimming the young shoots of gold privets can prevent adults from spawning on undeveloped leaves at the tips of young shoots, killing newly hatched larvae. To prevent the worm from happening.
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