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Prevention and Treatment of Lagerstroemia in Pomegranate Bonsai
Lagerstroemia velutipes, also known as pomegranate felt, is one of the main pests that harm the pomegranate bonsai, and it is also a common pest of the crape myrtle. First, the morphological characteristics adults: female adults flat, oval, 2-3 mm long, dark purple. When cooked, it is wrapped in a white velvet and looks like white rice. The male is about 1 mm long, purple-red, and one pair of wings. Eggs: purple, round. Larvae: purple-red, oval-shaped, with spikes on the edge of the body.蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹Second, life habits and hazards The occurrence of algebra in each year of Lagerstroemia cashmere varies from region to region. Wintering occurs in branches of fertile females, nymphs or eggs. Every year from early June to mid-July and September is the incubating period. The worms often accumulate on the base of the main veins of the twigs, buds and young shoots, sucking sap and weakening the tree vigor. It also induced serious coal pollution due to the secretion of a lot of honeydew, which made the leaves and branchlets black and lost their ornamental value. Third, the prevention and control methods 1, the spring before germination can be sprayed 3-5 Baume degrees lime sulfur, combined with pruning, cut pests severe branches. 2. There are many natural enemies of Lagerstroemia indica, predatory natural enemies are mainly red-lipped ladybugs, and they can prey on more than 50 Lagerstroemia velutipes per day. It can be introduced and raised from research institutes. 3. Improving the quarantine of bonsai pests is an effective measure to prevent and limit the spread of velvet. 4. During the incubation period of nymphs, the anti-drug-resistance of Lagerstroemia indica is a critical period for prevention and control. Can use 40% dimethoate or 40% omethoate 1000 times, or 2.5% deltamethrin 2500 times, 20% chrysanthemum EC 2500 times spray, can achieve good control effect. In the period of nymph and adult, the resistance of Lagerstroemia crenulata is enhanced, and the general spraying effect is not significant, and the effect is obvious when water-injection or root-adsorbing agent is used. When the basin soil is dry, it is used to water 40% omethoate 1000 times, the amount of which is the same as the amount of irrigation water, and the effect is obvious after 7-10 days. Buried granules, digging 1-2 cm deep small ring ditch around the rhizosphere of the pot, evenly into the granules, and then cover the soil filling the water, after 7-10 days, can receive good results. It is worth noting that pomegranate bonsai is strictly prohibited for the use of phossophos-methyl (trimethoprim, moroxydine) in order to avoid phytotoxicity.