Biology of Acrosternum bellum Rolston, 1983 (Hemiptera, Pentatomidae)
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Abstract
Studies on the biology of Acrosternum bellum Rolston, 1983, were carried out under laboratory conditions (Temperature = 24.6 ± 0.7 °C, Relative Humidity = 60.4 ± 4%; Photoperiod = 16 h light). Insects were fed with fresh fruits of Phaseolus vulgaris (L.). Mean time from oviposition to adult was 38.5 days. Cumulative mortality reached 74.5%, with the greatest mortality occurring in the second nymphal instar. The sex ratio of adults reared in the laboratory was 1.3 females: 1 male. Mean fecundity was 6.9 egg masses per female with an average of 13.9 eggs per mass. Adult longevity averaged 73.3 days. No significant differences (P > 0.01) were observed between sexes. Compared with other species of Acrosternum, such as A. armigera (Stal), A. hilare (Say), A. apicicorne (Spinola), and A. marginatum (Palisot de Beauvois), studied under similar conditions, A. bellum had a shorter cycle of development and higher nymphal mortality. Adult longevity and biotic potential were higher than in A. marginatum and shorter than in A. apicicorne.
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