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Recently, the continuous high temperature in Xi'an city, less rain, is conducive to the occurrence of insect pests, specially invited relevant units to do a good job in pest monitoring, increase the prevention and control of pests and diseases, reduce the harm of diseases and insects. The pests and diseases that focus on monitoring and control are as follows:
All kinds of insects (Japanese pot chain borer, ziwei velvet beetle, moon season white wheel shield bug, blowing sponge bug) are in the nymph incubation period, is the best period for control, such pests mostly gather in the young shoots and leaves of the plant and other parts, with a stinging mouthpiece to absorb the sap of the plant, seriously causing plant malnutrition, tree weakness, and even the death of the whole plant, and cause coal pollution pollution environment. Insect pests secrete wax to form a shell, general agents are difficult to enter the body, the control of insects must be the best control effect at the nymph stage (before the formation of the shell); sycamore lice secrete a large amount of wax filament, polluting the environment; for the peach red neck of the peach tree, cherry blossoms, red leaf plum, and the bare-shouldered star cattle that harm the willow tree and the plane tree, the light-shouldered star tianniu and other adult insects have begun to feather; the red spider has also entered the harmful period.
In addition, the units that have not been controlled in time for the national locust inchworm and the national locust small curl moth please actively control it, and a large number of leaves and baldness have appeared in some jurisdictions.
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Privet leaf spot disease of the large leaf
It mainly harms the leaves of privet and privet of small leaves. The leaves produce small brown spots at the beginning of the disease, and in the later stages, the edges of the spots appear dark brown broad-brimmed, the central light brown, and in severe cases, the leaves are covered with brown spots of different sizes. The pathogen overwinters in the diseased leaf with a conidial spore, and produces conidia for new infestations in the following spring or autumn when the conditions are suitable, and can be re-infected several times a year.
Prevention and control methods:
01
Pay attention to removing diseased leaves and remove fallen diseased leaves in time to reduce the source of disease.
02
At the beginning of the disease, spray Bordeaux liquid 500 times liquid or 75% Bacillus Clear wettable powder 700 times liquid, once every 10 days, a total of 2 sprays.
Monthly gray mold (flower rot)
It mainly infects the flowers, buds and young stems of the moon season. At the beginning of the disease, water-stained irregular spots are produced on the flowers of the month, which are slightly sunken and later browned and decayed. The onset of the bud also produces irregular water-stained irregular spots, and finally the whole bud becomes soft and decaying, and a large number of gray mold layers are produced. Pathogenic bacteria overwinter on host plant disease residues as sclerotia or mycelium. Pathogens spread with wind and rain, and high temperature and rain are conducive to the formation and spread of conidia in large quantities.
The infected diseased flowers are removed, and the diseased flowers are cut off and destroyed along with the stems a few centimeters below the bud.
Spray 300 times the 80% sulfur suspension or 0.2 pomerite sulfur mixture before the rainy season, and spray 500 times the 50% dinomysimide wettable powder at the beginning of the disease.
Japanese pot chain bug
(Dipterae)
The hosts are magnolia, magnolia, peach, begonia, willow, walnut, loquat, wood fragrance, pomegranate, fire thorn, etc., which can cause the death of plant branches or the death of the whole plant when severe, and induce coal pollution, resulting in blackening of the canopy. One generation occurs in each year, and the first month of June is the peak of nymph hatching.
Purple velvet beetle
(Homoptera)
Hosts are ziwei and pomegranate. Nymphs and female adults gather at the base of the main vein of the leaflets and shoot axillaries, shoots, branches and other parts of the sap, resulting in weak tree potential, poor growth, and secretion of a large amount of honeydew to induce mildew, resulting in blackening of leaves and branches, affecting photosynthesis. Two generations occur in one year, and mid-June and mid-August to early September are the peak periods for each generation of nymph hatching.
Monthly white-wheeled shield borer
(Acanthoptera)
For the moon season, roses, roses, yellow thorn plums, etc. In the case of nymphs and female adults clinging to the branches to suck sap, the affected part turns brown, and when it is severe, the entire branch is covered with bugs, the tree is weakened, the branches are dried out, and even the whole plant dies. Two generations occur a year, with fertilized female adults and 2-year-old nymphs overwintering in the branches, and the peak nymph hatching period is mid-to-late May and late August, with overlapping generations.
Blowing sponges
(Homoptera)
Hosts include sea tung, osmanthus flowers, plum blossoms, red leaf plums and other plants. If nymphs are clustered on the back of plant leaves, young shoots and branches, the branches and leaves fall, the tree weakens, and even the whole plant dies, and the "honeydew" is excreted when it is harmed, inducing coal pollution. Two generations occur every year, and the nymph hatching period is from mid-May to early june and mid-July to late August.
Control methods of insect shell insects:
Strengthen quarantine and do not plant insect plants.
Combined with winter plastic pruning, remove branches with severe pests and overwintering insects.
03
During the incubation period, the nymph spray is sprayed with 22.4% spironium ethyl ester suspension 4000 times liquid or 70% imidacloprid water dispersion 6000-8000 times liquid.
Bare-shouldered star Celestial Bull
(Coleopterae)
Adults of the bare-shouldered star tianniu that harm willows, poplars and other plants in our city have appeared, and June is the feathering and spawning period of adults. When adults lay their eggs, they carve grooves in the trunk of the tree and lay their eggs in the grooves. Prevention and control methods: 1. Strengthen the investigation and monitoring of willow trees and poplar trees, and spray drugs in time to control adult tianniu. 8% green Weire capsules can be sprayed with 200 to 300 times liquid; 2. The slot where the eggs laid by Tianniu are found to be artificially knocked to kill the eggs; 3. During the incubation period, needles such as trunk inlet bottles are used to control larvae.
Sycamore lice
(Homoptera psyllididae)
The hosts are sycamore, catalpa tree, and catalpa tree. Adult and nymphs suck sap on the back of sycamore leaves or on the young trunks of young branches to destroy the transport tissue. The nymph secretes white cotton-like waxy substances, which cover the tree body and leaf surface, affecting the normal photosynthesis and respiration of the leaves, and seriously polluting the surrounding environment. Occurs 2-3 generations a year, overwintering in places such as the bark cracks with eggs. The generational overlap of nymphs is serious, and the pest period is from May to October.
In combination with winter pruning, insect branches and excess side branches are pruned, and trees are whitened to eliminate overwintering eggs.
For pharmaceutical control at the initial incubation stage and adult feathering period of nymphs, 10% aphid net powder 2000-2500 times liquid, 2.5% imidacloprid 1000 times liquid or 1.8% avermectin 2500-3000 times liquid can be selected.
Protect and utilize natural enemies such as parasitic wasps and grasshoppers.
Monthly leaf bee
(Hymenoptera leaf bee)
The insect is mainly harmful to the leaves of the moon season, roses and other leaves, and the larvae bite the leaves, and only the leaf veins remain, resulting in a row of leaves. 2 to 3 generations a year, with the old larvae forming silk cocoons in the soil for wintering, May to mid-July for the first generation as the pest period, the end of July to mid-August for the second generation of pest period, mid-August to early October for the third generation of pest period. At present, it is the first generation of larval occurrence, which can be controlled by spraying 100 to 200 times with 20% insecticidal urea suspension or BT emulsion suspension with cyperodercetes.
Contact address: Xi'an City Beiguanzheng Street No. 3 Yunfeng Building 12th floor
-89576807
Source | Xi'an Institute of Landscape Architecture
Edit | Seven
Audit | Li Wei Danyang
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