Mulberry Tree Shield

The scientific name Pseudaulacaspis pentagona (Targioni-Tozzetti) Homoptera, shield Division. Alias ​​mulberry white, mulberry scale insects, peach scale insects, Mulberry white shield. Distributed in the country's mulberry planting areas.

The main host of the host is mulberry, tea, cotton, but also peaches, plums, apricots, cherries, apples, pears, grapes, walnuts, plum, persimmon, coriander, gooseberry, citrus and so on.

The traits of nymphs and female adults attract the twigs of the nymphs, occasionally causing damage to the fruit and leaves, weakening the tree vigor and causing death.

Morphological characteristics Adult females are 0.9-1.2mm long, pale yellow to orange-yellow, shell gray to yellow-brown, nearly round, 2-2.5mm long, slightly elevated, spiral pattern, brownish shell, partial side . Male body length 0.6-0.7mm, wingspan 1.8mm, orange to orange. The antennae are rosary and hairy. The forewings are ovate, gray-white, finely mottled; the hind wings are specialized as balance rods. Sexual acupuncture. The shell is slender, 1.2 to 1.5mm, white, with 3 longitudinal ridges on the back, and the orange-yellow shell is at the front. Eggs are oval in shape and are 0.25-3mm long. They turn yellowish-brown after the first pink, orange-red before hatching. The nymph was newly hatched in pale yellowish-brown, flat oval shape, about 0.3mm long, with eyes, tentacles, feet and feet, and two tail hairs at the end of abdomen. Between the two eyes, there were 2 gland holes, which secreted cotton wool wax covering the body, and the 2nd age eyes, antennae, feet and tail hairs were all degraded. Orange, yellow, oval, male only.

Living habits 5 generations in Guangdong, Zhejiang 3 generations, 2 generations in the North. In the second generation, the second generation of fertilized females was allowed to overwinter on the shoots. When the host germinates, it starts to smoke, and the body quickly expands. It starts spawning in late April. It is the mid-May period, the egg period is 9-15 days, and it hatches in May. The mid-to-late period is the peak, and the newly hatched nymphs are scattered to Two to five years old on a sticking branch, they have more branches and shades, and 6-7 days later they begin to secrete cotton-like wax and gradually form a shell. The first generation of nymphs is 40-50 days old, and the emergence begins in late June. The peak period is mid-July. The egg period is about 10 days. The second generation of nymphs is prosperous in early August. During the nymph period of 30 to 40 days, the male dies after the emergence of the nymphs in September. The females are harmed and begin wintering in late September. In the third generation, the first generation of nymphs occurred from May to mid-June; the second generation was from late June to mid-July; the third generation was from late August to mid-September. Winter of fertilized female adults.

Control methods (1) Northern mulberry dormancy period Brush off overwintering females on branches with hard brush or wire brush, cut off severely damaged branches, and then spray 5% mineral oil emulsion or engine oil emulsion (Suzhou product name 蚧螨灵) . (2) Protect and use natural enemies. (3) In the stage of the newly hatched nymph where the shell has not yet formed, the south is mixed with 10% diesel oil and soapy water, sprayed or applied, and 80% of dichlorvos 500-900 times or 50% of malathion EC may be used. Spray; In the young mulberry mulberry period with 20 times the oil emulsion plus 0.1% of the above-mentioned insecticide spray or smear; when the formation of the shell into the adult stage is more difficult to control, mulberry some with a 25-25 type 20% detergent solution smear, useful ordinary detergent 2kg, plus oil 1kg, 25kg water spray or smear is also effective.

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