Control method: spray with 10% imidacloprid wettable powder 2500 solution; Aphids appear on a small number of plum trees in the family, which can be diluted and sprayed with neem leaves, or spread on branches and leaves with aphids with plant ash, and washed with clear water after 1-2 hours.
Yellow-brown awning caterpillars eat buds, new leaves and leaves with larvae, spin silk on branches to form awning nets, and live in groups on the white awning. The mature larvae leave the canopy and spread out, overeating, and in severe cases, they can eat up the whole leaf.
Preventive measures: when larvae are found to gather in the crown, the net curtain can be removed and the larvae burned to death; Spraying with 2500 times solution of 10% imidacloprid wettable powder or 3000 times solution of 2.5% kungfu EC.
Anoplophora glabripennis is the main pest that harms the trunk of plum trees. On the ground of plum blossom pile foundation, reddish-brown insect dung is often piled up. ?
Prevention and control methods: at noon on a sunny day after rain in May and June, look for adults resting on branches and kill them, or spray them with 2.5% Kung Fu EC for 3000 times; After the wormhole is found in the trunk, insert the poison stick into the wormhole for fumigation, or plug the wormhole with cotton wool dipped in dichlorvos; In late autumn and early winter, the trunk is painted white.
There are many kinds of scale insects that harm plum blossom, mainly including mulberry Bai Dun scale, chaff scale, pear scale, Korean cocciscale, tortoise scale, brown soft wax scale and so on. Among them, the cone scale of Korea is the most serious. Nymphs and female adults mainly suck juice on branches, which weakens the tree potential in severe cases, causing branches to die or the whole plant to die. It is also the main carrier of plaster. When the pest is serious, the rate of insect plants reaches 90%, and the death of plum plants accounts for 85% of the total death.
Control methods: During the peak period of egg incubation in the first half of May, spraying with 50% 1000 times cartap, 500 times malathion or 40% 500 times acephate+2,000 times pyrethrin has a good killing effect on nymphs; Spraying 2000 times solution of 75% chlorpyrifos wettable powder also has certain effect on preventing and controlling coccidiosis in Korea.
The red spider is a spider mite. Plum blossoms generally suffer from it, which is more serious. Harm to the back of leaves of adults and nymphs. At first, yellow and white spots appeared on the front of the injured leaves, then the green area expanded, the leaves lost their luster, and in severe cases they were pale, leading to early defoliation. Adult mites are ovoid, red at first peeling, and turn dark red after feeding, about 0.5 mm in size, slightly smaller than nymphs and young mites. The insect occurs more than 10 generation a year, overwinters with eggs and adult mites in the cracks between the coarse skin and deciduous layer of branches, and it is the most serious in May-July drought.
Control method: 25% Bei Le Ba wettable powder is sprayed with 2000 times solution to kill; Or spray 20% pozzolana EC 2500 times, or spray 5% Nisolan emulsion 1500 times. Because the worm is small and hidden in the back of leaves, it must be sprayed carefully and evenly, and different acaricides should be used in turn.
Bag moth? That is, "eating goods." There are big bag moths, small bag moths, tea bag moths and white bag moths that harm plum blossoms and plums. The larvae are wrapped in a silk bag made of large broken leaves or a few branches arranged in disorder. It occurs once a year 1 generation, and the mature larvae overwinter in the bag; It pupates in April-May, emerges at the end of May, reaches the peak of larval hatching in early June, and overwinters as mature larvae in the capsule in June +065438+ 10. The newly hatched larvae climb out of the mother capsule at noon on sunny days, spin silk drooping, spread with the wind, and spin silk on suitable plum plants or other plants to form capsules. Larvae hide in cysts and feed on negative cysts during migration. At first, they feed on mesophyll, leaving the upper epidermis and turning the leaves into transparent spots. When they grow up, they eat leaves into holes or nicks, and even eat stem epidermis and pulp. When the high temperature and drought last for a long time, the harm is particularly serious. ?
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Control methods: pruning in autumn and winter, manual bag removal, and elimination of overwintering mature larvae; Use black light to trap and kill adults; Spraying 25% diflubenzuron 3 1500 times solution to kill larvae; At the peak of larvae, 50% malathion 1000 times solution was used to kill larvae; At the peak of spawning, the cotton bollworm nuclear polyhedrosis virus suspension with a concentration of 2 billion /g was sprayed 1000 times.
Spiny moth & namely "pepper". The thorn moths that harm plum blossoms include yellow thorn moth, bright green thorn moth, green thorn moth, flat thorn moth, flat yellow thorn moth, brown-edged green thorn moth and so on. In summer, larvae feed on leaves, and in severe cases, they can chew the leaves completely, leaving only thick veins and petioles, which affects the normal growth of plum plants and the flowering of pregnant buds. There are many poisonous hairs on the larvae, which have a serious stimulating effect on human skin, and once they touch human skin, they will have a strong burning feeling.
Prevention and control methods: artificial peeling of overwintering cocoons from branches in autumn and winter; In the emergence stage of adults, light trapping is carried out by using its strong phototaxis characteristics; Potted plants were sprayed with 0.3% azadirachtin 500 times solution, or 25% diflubenzuron No.3 2000 times solution, or 5% chlorfluazuron emulsion 1500 times solution.