What family does Spodoptera exigua belong to and how to identify it?

It belongs to the characteristics of cruciferous vegetable pests, also known as beet armyworm. Newly hatched larvae gather on the back of host leaves, spin webs and feed on mesophyll, leaving epidermis and transparent stomata. After the third instar, the damage is scattered, the leaves are bitten into holes or nicks, and sometimes it can also harm buds or fruits. In severe cases, only veins and petioles are left. Morphological characteristics: the adult is 10- 14 mm in length, grayish brown, with 1 row of black triangular spots on the outer edge of the front wing, and 1 row of kidney-shaped spots near the front edge of the front wing. There are yellow and white longitudinal bands in the abdomen. Eggs are spherical and white with white fluff outside. The last larva is about 22 mm long and its body color changes greatly, from green to dark brown. The connecting line under the abdominal flap is an obvious yellow-white longitudinal band, which reaches the abdominal end directly and does not bend to the hip and foot. There is a white dot on the upper rear of each throttle. Pupa is yellow-brown. Living habits occur 4-6 generations a year, pupae overwinter in the soil, and adults emerge in March-April. Adults hide in the daytime, move at night, have strong phototaxis, and lay eggs on the back of leaves, each with 10-250 eggs. Before 3-4 instars, larvae like to gather wrinkles or depressions between leaves, cover them with thin silk, bite mesophyll and leave epidermis. When I grow up, I eat through the leaves and have suspended animation. When the climate is dry, the situation is very serious. Control measures (1) Tillage beet fields in late autumn and early winter can eliminate some overwintering pupae. (2) Weeding in March-April in spring to eliminate 1 instar larvae on weeds. (3) combined with field work, the egg pieces were removed and the larvae were killed. (4) Before the third instar, spray 1 0,000 times of 20% diflubenzuron gel suspension, 1 0,500 times of 20% tebufenozide suspension,10.00% herbicide suspension and10.500 times of 5% formaldehyde dispersible liquid. 98% Bataan soluble powder 1000- 1500 times, 4.5% Yun Dan cheese 1500 times, 90% Wanling soluble powder 4000 times, 5% Regent EC 2500 times, 20% fenvalerate EC 2000 times, 2.5 times. (5) Spraying 500-700 times of Bacillus xylostella or Cordyceps powder containing more than 654.38+0.8 billion spores per gram in wet weather. (6) Using the sex pheromone of Spodoptera exigua.