The common bean weevil is a harmful pest listed as a quarantine pest by China. It mainly spreads through trade, introduction and transportation through infected beans. Eggs, larvae, pupae and adults can all be carried.

The bean weevil is an important pest of many kinds of beans and other legumes. The larvae feed inside the beans and cause serious damage to the stored edible beans.

The first instar larvae of Phaseolus vulgaris is about 0.8mm long and 0.3mm wide. The mesothorax and metathorax are the widest, tapering toward the abdomen. There is a small eye on each side of the head, located between the upper jaw and the antennae. Tentacles 1 segment. The prothoracic shield is "X" or "H" shaped, with an odontoid process on it. The dorsal plates of the 8th and 9th abdominal segments have oval ossified plates.

The foot is composed of 2 segments. Mature larvae are 2.4-3.5mm long and 1.6-2.3mm wide. The body is stout and curved in a "C" shape; the feet are degenerated. The upper lip has 10 setae, 8 of which are located near the outer edge and arranged in an arc, and the remaining 2 are located on both sides of the base. There is no prothoracic shield, and the dorsal plates of the 8th and 9th abdominal segments have no ossified plates.

The body length of adult bean weevil is 2~4mm. The head, chest and elytra are black, densely covered with yellow hair, and the back is dark gray, which is obviously different from the common bean weevils. The abdomen and buttocks are orange-red, densely covered with white hairs, mixed with yellow hairs. The head is long and broad, densely dotted, and the midline of the forehead is smooth without dots.

The antennae have 11 segments, the base 4 segments and the 11th segment are orange-red, the rest are black, the base 4 segments are filamentous, the 5th to 10th segments are serrated, the last segment is peach-shaped, and the end is pointed. thin. Pronotum conical. There are 3 teeth on the proximal ventral surface of the hind leg segment, 1 is a long and pointed large tooth, followed by 2 small teeth, the length of the large tooth is about twice as long as the 2 small teeth.

After anatomy, the male external genital penis is longer, the outer penis valve ends are blunt and pointed, both sides are concave, the tops of the leaves on both sides are enlarged, and there are two longitudinal micro-thorn areas at the front end of the inner penis. The area is dark.

Extended information:

The main distribution ranges of the kidney bean elephant are: Myanmar, Afghanistan, Turkey, Cyprus, North Korea, Japan, Uganda, Congo, Angola, Burundi, Nigeria, Kenya, Ethiopia, United States, Mexico, Brazil, Chile, Colombia, Honduras, Cuba, Nicaragua, Argentina, Peru, United Kingdom, 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 kidney bean weevil mainly hosts: daikon, white kidney bean, purple kidney bean, small white kidney bean, medium white kidney bean, large white kidney bean, dahlia kidney bean, dark red kidney bean, light red kidney bean, black flower bean Cowpeas, small black-flowered cowpeas, yellow-flowered cowpeas, eyebrow beans, golden beans, snow-white lentils, red lentils, mung beans, etc., cause harm to it.

The bean weevil is an important pest of many kinds of beans and other legumes. The larvae feed inside the beans and cause serious damage to the stored edible beans. Once introduced, it will cause heavy losses to China's bean production and also have a serious impact on bean exports. China has classified it as a hazardous pest under external quarantine and is strictly preventing the insect from being introduced into the country.

Baidu Encyclopedia-Phaseolus vulgaris