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Class Insecta, order Coleoptera, family Bruchidae, genus Acanthoscelides. Biological group. Oligophagous pest of leguminous. Morphology and biology. The beetle body is ovoid, slightly convex, light or dark brown, with yellow-green golden hairs and longitudinal spots from above, light gray hairs from below.
Its length varies from 2 to 5 mm. Dark brown short elytra do not cover abdominal end. Pronotum is wider than it is long; quadrangular scutellum is large. The insect has clavate antenna first segments are red-brown and yellow-red legs. Oblong egg is white, about 0. Young cylindrical white larvae have bristles and 3 pairs of legs. White pupa is about 4 mm in length. Overwintering of the Bean Weevil takes place at the stages of beetle or larva other stages can also winter ,usually in storehouses.
In southern part of the species area, the overwintering can be observed in plant residues. The beetles appear at the temperature At first they feed on vetch, peavine, lupin, alfalfa, and other leguminous cultures; they then move on to haricot bean, bean, soybean, lentils. The pest also migrates to grain fields.
In some days after coupling, female lay eggs into or on ripening pods by groups , piercing the pod sutures or gnawing holes. Fecundity of one female reaches eggs. The eggs develop during days. Larvae penetrate into the grains, eating the contents completely. Several larvae can develop in one grain to Larval period lasts Pupation also takes place in grain days.
Life cycle of one generation takes days. The pest arrives in the storehouse with grain where it develops until cold. The native land of this species is Central America. It was transferred with grain to Europe in the end of Nineteenth century; in the s it was brought to Crimea. Within the territory of the Former Soviet Union, the insect is marked with spotted distribution. Sometimes it is observed in the southern part of West Siberia.
In storehouses, the pest occurs in more northern territory. High harming activity is reported in Transcaucasia, Krasnodar Territory, in some regions of Ukraine. Higher and lower temperatures cause a decrease of fecundity. The species is very sensitive to temperatures below zero. The largest number and harming activity are observed at the end of June and in July.
Most important predators are Eupelmus degeeri Dalm. Economic significance. The Bean Weevil causes significant damage to haricot-bean and bean. Partially damaged grains lose their germinating power and taste quality. The pest damages grain in both field and storehouses, becoming rather harmful. Control measures include keeping the temperature below zero in storehouses, fumigation, insecticide treatments in fields.
Reference citations: Chelidze I. To studying bean weevil in Georgia and its control. In: Kanchaveli L. Proceedings of Georgian plant protection institute, N Egorov A. Entomologicheskoe obozrenie in Russian. Karapetyan A. About ecology and harming activity of bean weevil Acanthoscelides obtectus Say in Armenian conditions. Biologicheskii zhurnal Armenii 36 8 : in Russian.
Medvedeva V. Bean weevil and its control. Moscow: Publishing house of agricultural department. Bean weevil. Zashchita rastenii ot vreditelei i boleznei 2: in Russian. Ovodov I. Pavlyushin V. Zashchita i karantin rastenii in Russian. Ragimov K. In: Mzhavanadze A. Proceedings of Sixth Session of Transcaucasian Board to coordination research works on plant protection November, Rachvelishvili E.
The influence of air humidity on bean weevil Acanthoscelides obtectus Say. Proceedings of Georgian plant protection institute, Biological features of bean weevil Acanthoscelides obtectus Say in Georgia. Sai Mpu Fregat. Biological basis for control measures improvement on haricot-bean seeds against bean weevil. PhD Thesis. Moscow: TSKhA, 24 p. Sindyashina N. In: Salmin I. Shavrina E. About temperature and humidity influence on bean weevil number and damaging haricot-bean seeds at keeping conditions.
In: Novozhilov K. Leningrad: VIZR. Shevchenko M. Ecological features of bean weevil and basis for control measures. In: Zakolodina-Mitina L. Plant protection against agricultural pests, diseases, weeds in Pskov region Proc. Velikie Luki: SKhI. Pests of agricultural crops and forest plantations. Kiev: Urozhai. Berim, S. Udalov VIZR.
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