Recently, it is a high incidence period for various leaf-eating pests, and it is also a critical period for the hatching and transfer colonization of insect shell insect larvae, during which we can strengthen the control of insect shell insects and leaf-eating pests.
Pest control
Rosaceae trilophyllum Hymenoptera Trichophyllaceae
According to recent investigations, it was found that the damage of rose trichophylla wasps is more serious. The worm occurs in three generations a year, with overlapping generations. The hosts are mainly roses, moons, roses and other rosaceae plants. Female adults lay eggs on the negative side of the host's tender stem after mating. The egg stage is 7 to 10 days, and the larval stage is about 1 month. The worm eats a large amount of food, eating both day and night, and within a few days, the host leaves can be eaten out, leaving only the petiole or veins. Peak periods are from May to June and August to October. It is necessary to seize the critical prevention and control period from May to June.
Prevention and control methods
1. Artificial killing: the hazards of young larvae are multi-clustered, and can be artificially hunted in combination with daily pruning in the month and season.
2. Chemical control: use 2.5% cypermethrin emulsion 2000 times liquid, or 1.2% bitter smoke emulsion 1000 times liquid spray control.
Bridgeworm Lepidoptera Ullaidae
Large bridge-building insects are also known as cotton large bridge-building insects, cotton large inchworms and so on. The hosts are plants such as moonflowers, roses, grapes, hollyhocks, chrysanthemums, and grasses. The larvae feed on buds, leaves, young stems and other parts. Young larvae feed on leaf flesh, retain the epidermis, bite along the leaf vein or leaf margin after three years into holes and incisions, and enter the binge eating period after four years, and in severe cases, the plant can be eaten into a light rod.
Chemical control: you can choose 1.8% avermectin emulsion 2000 to 3000 times liquid, or 1.2% nicotinine 1000 times liquid spray control 1 to 2 times, spray once every 7 to 10 days.
Twill noctuidae Lepidoptera Noctiaceae
According to recent investigations, it was found that the harm of the twill moth is more serious. Twill nocturnal moth is a worldwide distribution of omnivorous pests, with a host of more than 100 families and more than 400 species of plants, mainly in the garden for lotus, water lily, caryophyllus, dahlia, marigold, cockscomb flower, moon season, horseshoe golden lawn and so on. The insect is predominantly larval. The first-instar larvae nibble on the back of the leaf, leaving only the upper epidermis, the affected leaves wither and yellow, and after the second instar disperse to the leaf back, and the larvae eat leaves into missing or holes. After entering the gluttony period after five years of age, the leaves can be eaten into light rods or only leaf veins, and it is hoped that all units will strengthen the investigation and take preventive measures in time.
1. Artificial control: At the young age of the larvae, before the damage has been transferred, the leaves can be manually removed.
2. Chemical control: 10% imidacloprid 1000 times liquid or 40% chlorpyrifos 1000 times liquid can be sprayed.
Moths Lepidoptera
At present, the first generation of adults of the moth has been feathered, and the worm hides in the pouch and sticks out its head to feed on the leaf hazards. After the adults cross their tails, they lay their eggs in the bag, and the eggs also hatch in the bag, and the hatching rate is extremely high. In late May, the larvae hatch, the larvae crawl in silk bags or rely on the wind to spread the hazard. It mainly harms plane trees, camphor trees, red-leaved heather, maple poplar, peach, pomegranate, ziwei, bauhinia tree, luan tree, osmanthus flower, elm tree, and other plants.
1. Artificial control: artificial pest removal bags can be removed to kill centrally.
2. Chemical control: Spray 10% imidacloprid 1000 times liquid, or matrine nicotine emulsion 1000 times liquid, or 2.5% cypermethrin 3000 times liquid spray control.
Purple velvet plover, Hemiptera, Velvetaceae
Purple velvet beetle mainly uses nymphs and female adults to live in groups of plant branches, bud axillaries and other places to suck sap, and the honeydew secreted by it is easy to induce coal pollution. Female adults are flattened, oval- and when mature, they are wrapped in a white wax shell and look like white grains of rice. Occurs 2 to 3 generations a year, the end of May to the beginning of June is the peak of nymph hatching, is the peak period of the transfer of nymph velvet nymph, this is the key period of control, if the transfer colonization forms a bug shell, it is more difficult to control, and all units can seize this key period of control.
Red wax flies Hemiptera Hemiptera
Adults and nymphs densely sting sap on plant branches and leaves, and can induce coal pollution disease, resulting in plant growth decline, and in severe cases, it can cause the whole plant to die. The worm overwinters on plant branches as fertilized female adults. Hatching nymphs mostly crawl away from the mother at noon on sunny days, and then gradually fix on the branches and leaves. At present, the insect is in the early stage of nymph colonization hazards, which is the best time for control.
Turtle wax borer Hemiptera Hemiptera
The worm is harmed by nymphs and female adults sucking plant sap. When the damage is light, the tree is weak, inducing coal pollution, and the branches are thin and yellow; when the damage is heavy, the branches and leaves fall, and even the whole plant dies. It mainly harms plants such as tung tree, cedar, gardenia, fire thorn, laughing, red leaf plum, pomegranate, plum, privet, begonia and so on. According to the survey, it is currently the peak period of turtle wax beetle eggs hatching, and it is better to grasp the prevention and control effect of medication at this time.
Integrated management methods for shell insects
1. Artificial control: can manually scrape the insect worm, or combine pruning to cut off the parasitic branches.
2. Protection of natural enemies: minimize the use of highly toxic chemical pesticides, and protect their natural enemies, red-spotted ladybirds and various parasitic wasps.
3. Chemical control: from the end of May to June is the incubation period of nymphs, 10% imidacloprid 1200 times liquid and 40% chlorpyrifos 1000 times liquid can be sprayed, and mixed with green ying emulsion during application can play a synergistic effect.
disease control
Powdery mildew with large leaf boxwood
Powdery mildew can occur throughout the country. The pathogenic pathogen mainly infects the leaves of boxwood macrophyllum, and the symptoms are manifested by white powder on the leaf surface or on the surface of the leaf back and young shoots, and gradually become white-gray felt-like in the later stages. In severe cases, the leaves are curled, the branches are slightly twisted and deformed, and even die. The recent high humidity weather and suitable temperature in Wuhan are extremely conducive to the occurrence and epidemic of the disease, and all units need to strengthen prevention and control.
1. Cultivation management: strengthen maintenance management, reasonable dense planting, appropriate pruning, fertilization, create a ventilated and transparent cultivation environment, and improve the disease resistance of plants.
2. Chemical control: After the onset of the disease, spray 25% triazolone wettable powder 1000 times liquid, or 70% methyl thiophanol wettable powder 800 times liquid spray.
Kanemori Privet anthrax
Jinsen privet anthrax occurs more severely in the Wuhan area. The pathogenic pathogen of this disease has a long incubation period and no obvious symptoms during the incubation period. At the time of onset, pale yellow spots appear on the initial leaves, which are round, nearly circular, semi-circular, irregular spots, dark brown after expansion, and the center of the spots become grayish-white in the later stages of the disease, with dark brown edges and yellow halos outside the spots. There are small black particles on the spots. At this time, it is more difficult to prevent and control, so in previous years, it is necessary to prevent and treat as soon as possible in areas with severe disease.
Chemical control: 60% anthrax Fumei wettable powder 800 times liquid or 25% azoxystil suspension 1000 times liquid can be sprayed for spray control.
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