Flatworm
Scientific name: Thosea sinenisi (Walker) Lepidoptera, Hymenoptera. Alias ​​black spot moth. Distribution of Northeast, Hebei, Shandong, Anhui, Jiangsu, Zhejiang, Hubei, Hunan, Jiangxi, Fujian, Taiwan, Guangdong, Guangxi, Sichuan, Yunnan.
There are more than 40 kinds of plants such as hemp, tea, mulberry, apple, pear, peach, plum, apricot, orange, cherry, jujube, persimmon, batch, and walnut.
The damage is characterized by yellow sting moth.
Morphological characteristics Adult body length 13-18mm, wingspan 28-39mm, body dark grayish brown, ventral and foot color dark, antennae female filamentous, more than 10 bases were dentate, male feathers. The forewings are slightly purplish and purplish, and there is a distinct dark brown twill on the outside of the middle wing. It slopes from the near edge of the leading edge to the middle of the trailing edge. There is a black spot in the upper corner of the middle room, and the male moth is more obvious. The hind wings are dark grayish brown. Oval oval, 1.1mm long, pale yellowish green, grayish brown. The larvae are 21-26mm in length, flat and oval in shape, with slightly dorsal spines resembling a turtle's back, greenish or yellowish green, and dorsal lined with white and marginal blue; on each side of the body, there are 10 knob-like protrusions with bristles on each side. Each section There are 2 small clumps of bristles on the back and 1 red dot on each side of the back of the 4th section. The carcass length is 10-15mm, and the front end is more fat, near elliptical, colostrum white, and becomes brownish when near feathered. It is 12-16mm long, oval, dark brown.
Living habits are 1 generation in the North, 2 generations in the lower reaches of the Yangtze River, and a few 3 generations. All the mature larvae lived in the 3-6cm soil layer under the tree before the wintering. In the first-generation zone, phlegm began in mid-May, and eclosion and spawning began in early June. The occurrence period was not neat, and newly hatched larvae were seen in the middle of June and early August. In August, the most serious larvae occurred in August. They began to mature in late August. Into the soil, it is wintering. The 2-3 generations began to phlegm in mid-April and emerged in mid-May and early-June. The first generation of larvae occurs in the late May to the middle of July. Generation 2 larvae occur in late July-mid-September. The third generation larvae occur in the first ten months of September. The last mature larvae were introduced into the soil for wintering. Adults are often excavated at dusk, and they are nocturnal and dormant. They can mate after emergence and lay eggs 2 days later. They are spawned on the leaves. The egg period is about 7 days. The larvae have a total of 8 instars, and they can eat whole leaves from the 6th instar.
Control methods (1) Excavate the insects in the soil around the tree base to reduce the source of insects. (2) The larvae are sprayed with 80% dichlorvos EC 1200 times or 50% phoxim EC 1000 times, 50% malathion EC 1000 times, 25% iminophos EC 1000 times, 25% ICAS emulsifiable concentrate 1500 times, 5% Celestine EC 3000 times.
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