Larval development ofSpodoptera eridania andSpodoptera frugiperda fed on fresh ear of field corn expressing theBt proteins (Cry1F and Cry1F + Cry1A.105 + Cry2Ab2)

Ciência Rural

关键词: biology;    integrated pest management;    fall armyworm;    Southern armyworm;    varietal resistance;   

DOI  :  10.1590/0103-8478cr20151461

来源: DOAJ

【 摘 要 】

ABSTRACT: The objective of this study was to evaluate extent of larval period, larval survival (%), food consumption, and pupal biomass of Spodoptera eridania andSpodoptera frugiperda (Lepidoptera: Noctuidae ) fed on fresh ears of field corn expressing Bt proteins (Cry1F and Cry1F+Cry1A.105+Cry2Ab2). Larvae of Spodoptera spp. survived less than two days when they consumed Bt corncobs and showed 100% mortality. Spodoptera eridania reared on non-Bt corn cobs showed higher larval development (21.6 days) than S. frugiperda (18.4 days) and lower viability (56.4% and 80.2% for S. eridania andS. frugiperda , respectively). A higher amount of corn grains was consumed by S. eridania (5.4g) than by S. frugiperda (3.9g). In summary, this study demonstrated that the toxins Cry1F and Cry1F + Cry1A.105 + Cry2Ab2 expressed in fresh corn cobs contributed to protect ears of corn againstS. frugiperda and the non-target pest S. eridania . However, itis important to monitor non-Bt cornfields because of the potential of both species to cause damage to ear sof corn.

【 授权许可】

Unknown