Scientific name Scotogramma trifolii Rottemberg Lepidoptera, Noctuidae. Alias ​​clover. It is distributed in the sugar beet production areas in the Northeast, North China and Inner Mongolia.

Host beets, flax, corn, cabbage, soybeans, castor, etc.

The larvae bite the beet heart and affect the normal growth of sugar beets. The sugar beet leaves were eaten at the time of the onset, leaving only the veins and petioles.

Morphological characteristics Adult body length 15-19mm, wing exhibition 34-40mm, body and forewing light tan, brown, gray and slightly shiny. Antenna filamentous. The horizontal lines of the forewings are very thin and white. There are seven nearly black triangles on the outer edge. The outer edges are yellowish-white and wavy. There are clearly yellow-white and two-pointed outward “W”-shaped patterns. The inside of the subbaseline and the outside of the internal horizontal line are all accompanied by thick brown edges. Renal shape is large and obvious, dark gray. Rings are small, yellow, with short thick rods below. The hind wings are light yellow and have a wide dark band near the outer edge. Egg length 0.56 to 0.7mm, flat round, flat bottom, vertical and horizontal surface line. The last instar larvae are 28-35mm long, with large changes in body color, multiple wrinkles, yellow and white lines on the top and back lines, black valves, and yellow-white broad band on the valve line. There are black short lines near the subline of each body section. . The length of the dragonfly is 13-14mm. The abdomen has sections on the back of the 5-7 section with engraved dots. The middle part is more dense. There are 2 hip punctures at the end of the body and there are 6 short stings around.

Living habits 3 generations south of Yinshan, Inner Mongolia, and the third generation of storks live in the earth. Overwintering adults usually appear in mid-to-late April. Adults are nocturnal, night feeding, mating and spawning, and have a strong tendency towards black light and honey attractants. One to two days after mating, eggs are laid on the back of the leaves. The development of the egg varies with the temperature. The average daily temperature is above 18°C, usually 5 days, and below 14°C, it extends to 16 days. Instar larvae have drooping drooping and dead-dead habits. After 3rd instar, there is a habit of subterranean earth. Most of them are in the soil near the soil or dead leaves, and they often feed at night. A total of 5 instar larvae, larvae ll a 32 days, mature larvae in the soil phlegm.

For control methods, see Spodoptera exigua.

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