What is the bean elephant in Insect?

Elephant weevil is one of the exotic quarantine pests in China, which is mainly spread by infected beans through trade, introduction and transportation. Eggs, larvae, pupae and adults can be carried.

Elephant is an important pest of many kinds of beans and other beans, and its larvae feed in beans, which causes serious harm to stored edible beans.

Bean 1 instar larvae are about 0.8 mm long and 0.3 mm wide. The middle chest and the back chest are widest and gradually taper towards the abdomen. There are 1 small eyes on both sides of the head, which are located between the palate and the antenna. Antenna 1 node. The chest shield is "X" or "H" with dentate process. There are oval ossifying plates in the spine of the 8th and 9th abdominal segments.

The foot consists of two parts. The mature larvae are 2.4 ~ 3.5 mm long and 65438 0.6 ~ 2.3 mm wide. The body is thick and bent into a "C" shape; Foot degeneration. There are 10 bristles on the upper lip, 8 of which are located near the outer edge and arranged in an arc, and the other 2 are located on both sides of the base. There is no chest shield, and there is no ossifying plate on the back plate of the 8 th and 9 th abdominal segments.

The adult Phaseolus vulgaris is 2 ~ 4 mm long. The head, chest and coleoptera are all black, densely covered with yellow hair, and the back is dark gray, which is obviously different from several common bean elephants. The abdomen and hip plate are orange-red, densely covered with white hair and mixed with yellow hair. The head is long and wide, with dense lines, and the midline of the forehead is smooth without lines.

The antenna 1 1, the base 4 and 1 1 are orange-red, the rest are black, the base 4 is filiform, the node 5- 10 is serrated, and finally the node is peach-shaped with tapered ends. The front chest backboard is conical. There are three teeth near the ventral surface of the hind leg joint, 1 is the long and sharp big tooth, followed by two small teeth, and the length of the big tooth is about twice as long as the two small teeth.

According to anatomy, the male external genitalia penis is long, the end of the external penis flap is blunt and round, the two sides are concave, the top ends of the two sides are enlarged, and the front end of the internal penis has two longitudinal micro-pricking areas, which are dark in color.

Extended data:

Elephants are mainly distributed in Myanmar, Afghanistan, Turkey, Cyprus, North Korea, Japan, Uganda, Congo, Angola, Burundi, Nigeria, Kenya, Ethiopia, the United States, Mexico, Brazil, Chile, Colombia, Honduras, Cuba, Nicaragua, Argentina, Peru, Britain and Austria.

Belgium, Italy, Portugal, France, Switzerland, Yugoslavia, Hungary, Germany, Greece, Netherlands, Spain, Romania, Albania, Poland, the former Soviet Union, Australia, New Zealand, Fiji, Jilin, etc.

The main hosts of kidney beans are: Dalai beans, white-skinned kidney beans, purple-skinned kidney beans, small white kidney beans, medium white kidney beans, large white kidney beans, Dali flower kidney beans, deep red kidney beans, light red kidney beans, black flower cowpea, yellow flower cowpea, eyebrow bean, golden bean, white lentil and red bean.

Elephant is an important pest of many kinds of beans and other beans, and its larvae feed in beans, which causes serious harm to stored edible beans. Once introduced, it will bring huge losses to China's bean production and also have a serious impact on bean exports. China listed it as a harmful insect for external quarantine to prevent its introduction.

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