Abstract
Acanthoscelides Schilsky is the large genus of Neotropical bruchid beetles, in which most species show host plant specialization. The species of A. obtectus Say specialized on Phaseolus beans and therefore considered pests. Six legume grain species (Dried common bean, green common bean, lentil, cowpea, broad bean, and soybean) were selected to study the biology of this insect pest on these different legumes under the prevailing environmental conditions of 25 ± 2°C and 60 ± 10% RH. The results showed that an average number of eggs per mated female (fecundity) was recorded in common bean dried and green (26.33 and 22.66 eggs). While the fecundity decreased significantly to 10.00, 9.66 and 4.00 eggs/ female at Soybean, Broad bean and Lentil, respectively. The results also showed that there was a significant difference (p<0.05) in the percentage of emerged adults among the different legume hosts, namely dried common bean and Cowpea the highest value (88.00 and 76.65%) and lowest percentage (17.97%) of emerged adults in green common bean respectively, while no adults emerged in Soybean, Broad bean and Lentil hosts and the developmental periods of A. obtectus on different legume hosts and mean periods varies depending upon the different hosts.
Highlights
Beetles belonging to the family Bruchidae are the most important insect pests of stored legumes
76.65%) and lowest percentage (17.97%) of emerged adults in green common bean respectively, while no adults emerged in Soybean, Broad bean and Lentil hosts and the developmental periods of A. obtectus on different legume hosts and mean periods varies depending upon the different hosts
Biology of Acanthoscelides obtectus Say in Different Legume Grains: Six-legume grain species (Dried common bean, green common bean, lentil, cowpea, broad bean, and soybean) were selected to comparative biology of this insect pest on these different legumes under the prevailing environmental conditions of 25 ± 2°C and 60 ± 10% RH
Summary
Beetles belonging to the family Bruchidae are the most important insect pests of stored legumes. The neotropical genus of Acanthoscelides Schilsky (Coleoptera: Bruchidae), comprises almost 300 species of grain-eating beetles (Jhonson, 1990). It is one of the most diverse bruchid genera specialized in species and varieties of the fabaceous genus Phaseolus (common beans, lima beans, etc.), but grains of other fabaceous genera are attacked. The species of A. obtectus Say, multivoltine and can reproduce as long as resources are available. This species has a dimorphism, and appeared a great diversification between their individuals, such as colour variations in the antennae of male and female, and size between sexes, and distributed worldwide. Clarify and determined good taxonomic characters to distinguish the individuals of this species, and footing for fundamental and applied research of these bean bruchid
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