Saccharum angustifolium (Nees) Trin. (Poales: Poaceae) as hibernacle for stink bugs during the soybean and corn off-season in Southern Brazil

ABSTRACT Host plants are key factors in the survival of true bugs during unfavorable periods. The objective of this study was to evaluate the composition, diversity and abundance of pentatomid bugs in Saccharum angustifolium (Nees) Trin. (Poales: Poaceae). Plants were evaluated during the soybean and corn off--season for five years. A total of 250 plants were sampled, the true bug population was counted and used for statistical and faunistic analysis. We observed the occurrence of the species: Euschistus heros (F.), Dichelops furcatus (F.), Dichelops melacanthus (Dallas), Edessa meditabunda (F.), and Edessa ruformaginata (De Geer). Among the species, the highest population density was verified for E. meditabunda, E. heros, and D. furcatus. We also observed a direct effect of the clump diameter on the population density of E. heros, D. furcatus, and E. meditabunda. Finally, we conclude that S. angustifolium plants serve as adequate hibernacles for the survival of true bugs of economic importance during the soybean and corn off-season.

摘要 寄主植物是异翅亚目昆虫（true bugs）在逆境时期存活的关键因素。本研究旨在评估狭叶甘蔗（Saccharum angustifolium (Nees) Trin.，隶属于禾本目（Poales）禾本科（Poaceae））上的蝽科昆虫（pentatomid bugs）的组成、多样性与种群丰度。研究于大豆与玉米休耕期连续开展五年调查，共采集250株样本，对异翅亚目昆虫种群数量进行计数，并开展统计学与区系分析。本次调查共记录到以下物种：Euschistus heros (F.)、Dichelops furcatus (F.)、Dichelops melacanthus (Dallas)、Edessa meditabunda (F.) 以及Edessa ruformaginata (De Geer)。在上述物种中，E. meditabunda、E. heros与D. furcatus的种群密度最高。此外还发现，植株丛径对E. heros、D. furcatus及E. meditabunda的种群密度具有直接影响。本研究最终证实，S. angustifolium可作为具有经济重要性的异翅亚目昆虫在大豆与玉米休耕期的适宜越冬场所。