Scientific name Aphis citricola Van der Goot Homoptera, Amaranthidae. Alias ​​apple astragalus, apple leaf aphids. Distribution from the north of Heilongjiang, Inner Mongolia, south to Taiwan, Guangdong, Guangxi.
Hosts Spiraea, papaya, heather, hemp hydrangea, eucalyptus, jellyfish, cherry blossoms, hawthorn, citrus, wolfberry, plum, apricot and so on.
The characteristics of the damage are adults, nymphs, sucking leaves and shoots of sap. After the leaves are damaged, they roll back toward the back, affecting the shoot growth and tree development.
Morphological characteristics adult insectless female embryos body length 1.6-1.7mm, width 0.94mm, long oval, mostly yellow, sometimes yellow-green or green. Light black head with l0 hairs. Mouthpiece, abdomen tube, tail piece black. The body surface has a reticular pattern, the lateral edge of the body is a tucocephalic head, and the back of the body is the tip of the hair. There are 1 pair of central hairs in the abdomen. Except for sections 1 and 8, there are l pairs of marginal hair, and the 2-7 sections each have 2 pairs of marginal hairs. . Antennae of 6 knots, filiform, no secondary sensory circle, shorter than body, base black, 3-6 sections with tile pattern. The end of the tail plate is round, 12 to 13 hairs are born, and the length of the belly tube is also wavy. The winged females have a body length of about 1.5mm, a wingspan of about 4.5mm, and a spindle shape. The head, chest, abdomen and tail piece are black, and the abdomen is green or light green to yellow-green. Two to four abdominal segments on both sides with a large black-rim spot, abdomen after the plaque is greater than the former spot, 1-8 abdominal segment with a short horizontal band. Mouthpiece black, compound eyes dark red. The antennae are 6 knots, filiform and shorter than the body. There are 5-10 secondary sensory circles in the 3rd and 0-4 in the 4th. Body surface texture is not obvious. Nymphs bright yellow, compound eyes, tentacles, feet, abdomen black. Without wings, if the corpus callosum is hypertrophic, the abdomen is short. If wings are more developed, their wings are buds. Egg oval, 0.5mm long, early yellow to yellowish brown, black paint, shiny.
Life habits are more than 10 years old, wintering at the branches, buds and skin seams. After the host of late spring, the overwintering egg hatched as a dry mother. In late April, the back of the bud, tender shoot, and new leaf was damaged more than 10 days. It matured and began parthenogenetic reproduction until the end of autumn. Only the last generation of the egg was hatched, and there was no sexual reproduction. Wings Spawning females and winged males mating and spawning winter. Due to the low temperature and slow propagation in the early stage of damage, more than one wingless female was born. In the late May, there was a winged orphaned female oyster, which migrated to fly. In June-July, the breeding was the fastest, and the branches, petioles, and leaves were the most common. The burrowing worm is a serious period of serious damage due to the rapid growth of the density of the larvae, causing the leaves to roll toward the sides of the leaves, and the tips of the leaves are bent in the direction of the dorsal and petiole. During the rainy season of August-September, the population density of the worms decreased, and sexual mating eggs were produced from October to November. Generally, the eggs laid before the first frost can safely pass through the winter. Natural enemies include ladybugs, grass lings, fly aphids, and bees.
Prevention and control methods (1) Combine the summer shear and cut off the victim branches. And protect natural enemies. (2) Spray 5% diesel emulsion or clay diesel emulsion before germination in early spring. (3) After the hatching of the overwintering eggs and during the damage period, timely spraying 30% Tao Xiaoling EC 2500 times solution or 50% anti-influx (developing fog) ultra-fine WP 2000 times solution, 30% oxy-cyano-Cyanide 2000 times Liquid, 50% chlorbenazirone (trimethoprim) EC 1000 to 1500 times, 10% cypermethrin EC 3000 times, 43% cyflufenapyr EC (New Braun) EC 1500 times (Beijing Shunyi Pesticide Factory), 2 .5% Kung Fu EC 3000 times. (4) Liquid coating. Woody medicinal plants When the aphid was first developed, a 6-cm wide medicine ring was coated with a brush on the upper part of the trunk or at the base of the main branch, and it was coated with a plastic film after coating. 40% Dimethoate EC can be used 20-50 times. If necessary, use 50ml of 20% fenvalerate EC, add 50kg of water, add 50mL of anti-fail solution, stir and spray. Can also be used 40% Dimethoate EC, 667m2 medication 50mL add water 60kg, and then add the elimination solution 50ml significant effect. In addition, it is also possible to use 50% cyanocyanine 1500 times liquid and 50% Beinong 931 insecticide 400mg/kg. Can also be used 2.5% Kung Fu EC 30ml, plus 60kg of water, and then add 30mL elimination solution, control efficiency significantly improved. (5) Advocate the use of 400-500 times of mold of mold, and choose to spray evenly on sunny day before the peak of aphid.
Anti-Allergic Agents,Chlorphenamine Tablets 4Mg
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