Abstract
Laboratory studies were conducted to evaluate nymph survivorship, developmental time, and fresh body weight at adult emergence, and adult survivorship, total longevity, reproduction, and fresh body weight gain of the Neotropical stink bug, Euschistus paranticus Grazia (Heteroptera: Pentatomidae). In the field, a one-year weekly survey was carried out on the wild plants, Scutia buxifolia Reissek (Rhamanaceae) and Prunus myrtifolia (L.) Urb. (Rosaceae) in Passo Fundo, RS, Brazil (28°15′S latitude; 52°24′W longitude). Results indicated that nymph mortality was very high (range 87-100%) and on only two (green bean pod + raw shelled peanut and green bean pod alone) out of the nine foods, nymphs were able to complete development. Nymph developmental time (2 nd to 5 th stadia) took ≈ 33 days on green bean pod + peanut seed, and ≈ 54 days on green bean pod. Adults E. paranticus fed pods of green bean, raw shelled peanut, mature seed of soybean, and leaf of S. buxifolia in the laboratory showed a total longevity of ≈ 40 to 55 days; 50% females oviposited; the pre-oviposition period was 18.9 days; number of egg masses/female was 9.3; mean total number of eggs/female was 103.6, and their viability was 55.6%. Females were heavier than males. E. paranticus was intercepted mostly during spring-summer on S. buxifolia, and only occasionally on P. myrtifolia.
Highlights
Within the genus Euschistus, the sub-genus Mitripus (Heteroptera: Pentatomidae) was proposed by Rolston (1978) to accommodate seven South American species. Grazia (1987) described and included in this sub-genus two new species E. (M.) hansi and E. (M.) paranticus
Not much was found in the literature regarding this uncommon Neotropical stink bug, except for the capture of 12 specimens on wild vegetation using a sweep net at Canguçu County (31°05′S and 52°50′W) and at Barra do Quaraí County (30°11′S and 57°30′W) during 2003-2004 (Bunde et al, 2010); and 2 specimens on wild vegetation at the Turvo State Park (27°00′S and 53°40′W) (2004-2005) (Schmidt & Barcellos, 2007), all in Rio Grande do Sul state, Brazil. This group of stink bugs of the sub-genus Mitripus is mostly restricted to the north of Argentina, Uruguay and southern Brazil (Bunde et al, 2006) and their biology is practical unknown
During September-November 2011, adults of E. paranticus were field-collected by shaking the branches over a plastic white cloth of the two wild plants, Scutia buxifolia Reissek (Rhamanaceae), and Prunus myrtifolia (L.) Urb. (Rosaceae) at the Embrapa Wheat field experiment station at Passo Fundo, RS, Brazil (28°15′S latitude; 52°24′W longitude)
Summary
Within the genus Euschistus, the sub-genus Mitripus (Heteroptera: Pentatomidae) was proposed by Rolston (1978) to accommodate seven South American species. Grazia (1987) described and included in this sub-genus two new species E. (M.) hansi and E. (M.) paranticus. Not much was found in the literature regarding this uncommon Neotropical stink bug, except for the capture of 12 specimens on wild vegetation using a sweep net at Canguçu County (31°05′S and 52°50′W) and at Barra do Quaraí County (30°11′S and 57°30′W) during 2003-2004 (Bunde et al, 2010); and 2 specimens on wild vegetation at the Turvo State Park (27°00′S and 53°40′W) (2004-2005) (Schmidt & Barcellos, 2007), all in Rio Grande do Sul state, Brazil This group of stink bugs of the sub-genus Mitripus is mostly restricted to the north of Argentina, Uruguay and southern Brazil (Bunde et al, 2006) and their biology is practical unknown. A survey was systematically conducted on the two species of wild plants they were intercepted, in order to elucidate the phenology of the bugs around the year
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