Entomologia Experimentalis et Applicata (1997) 82, 213-217

Antônio R. Panizzi and Lúcia M. Vivan (1997)
Seasonal abundance of the neotropical brown stink bug, Euschistus heros, in overwintering sites, and the breaking of dormancy
Entomologia Experimentalis et Applicata 82 (2), 213-217
Abstract: The seasonal abundance of the neotropical brown stink bug, Euschistus heros (Heteroptera: Pentatomidae), in overwintering sites in northern Paraná state, Brazil (latitude 23°11' S, longitude 51°11' W) was monitored from September 1994 to August 1995. The breaking of dormancy (oligopause) was studied in the laboratory by comparing the feeding activity and reproduction of adults collected in the field under different physiological conditions (i.e., dormant and non-dormant). No bugs were found in overwintering sites during the summer (December to February) and during early autumn (March). From mid-autumn to winter (April - August), the number of E. heros captured in these sites gradually increased, decreasing thereafter with the start of spring in September. Dormant and non-dormant E. heros taken to the laboratory and maintained at 25 ± 1 °C, 65 ± 5% r.h., and L14: D10 photoperiod, and given suitable food (soybean pods or seeds), began feeding immediately. The number of stylet sheaths deposited/day on the food was greater for non-dormant than for dormant adults. Feeding activity was greater on immature pods than on mature seeds of soybean. Dormant females placed under suitable biotic and abiotic conditions took ca. 2 weeks to start reproduction, in contrast to non-dormant females, which reproduced immediately.
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Link to article at publishers website
Database assignments for author(s): Antônio R. Panizzi

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Euschistus heros	Soybean (Glycine max)	Brazil (south)