Life History of Piocoris varius (Heteroptera: Lygaeidae) in Ibaraki and Chiba, Japan.

Abstract

The life history of the big-eyed bug, Piocoris varius, was investigated in two locations in Ibaraki and Chiba, Japan in 2004 by observing seasonal changes in the stage composition of field populations. The nymphal instar of field-collected samples was identified by comparing their head capsule widths with those of laboratory-reared individuals. P. varius nymphs and adults were found on 19 plant species (12 families) of 24 species (14 families) on which the population census was made. Overwintering adults became active on plants in May and disappeared in July. Firstgeneration young nymphs appeared in late May and June. They developed into old nymphs in late June and then emerged as adults in late July and August. After August, adults predominated until December, although a small proportion of second-generation nymphs occurred in August and September. Only adults were found under the litter in December. These observations indicate that P. varius is basically a univoltine species with a partial bivoltine lifecycle in the Kanto district in Japan.

Effect of Temperature on the Development, Oviposition and Predation of the Bigeyed Bug, Geocoris pallidipennis Costa (Hemiptera: Lygaeidae)

“…주로 채집되는 식물은 들깨, 가 지, 라벤다 등 12과 19종이나 특정식물에 대한 의존성은 낮은 것 같다 (Mukawa et al, 2006). 생물학적 특징은 동일한 환경에 서 같은 먹이를 제공하더라도 종에 따라 발육기간, 생존율, 산 란수가 다르며 Bacon, 1972a, 1972b;Torres et al, 2004;Mansfield et al, 2007), 온도 24℃와 광주기 11:13(L:D) 의 단일조건에서 휴면을 한다 (Ruberson et al, 2001;Brannon et al, 2006).…”