Larval survival and plant injury of Cry1F-susceptible, -resistant, and -heterozygous fall armyworm (Lepidoptera: Noctuidae) on non-Bt and Bt corn containing single or pyramided genes

Performance of Agrisure®Viptera™ 3111 corn against Helicoverpa zea (Lepidoptera: Noctuidae) in seed mixed plantings

“…Yang et al (2013) showed that in an F 2 screen on Viptera 3111 corn leaf tissue, all 14,400 F 2 neonates of 150 singe-pair families of S. frugiperda were killed within 7 days. Similarly, Niu et al (2013Niu et al ( , 2014 and Huang et al (2014) demonstrated that larvae of highly Cry1F-resistant populations of S. frugiperda could not survive on either leaf tissue or whole plants of Viptera 3111 corn. We understand that all of these studies were not particularly designed to evaluate the high dose qualification as required by the US-EPA Scientific Advisory Panel (US-EPA, 2001).…”

“…Additionally, a previous five-year field study showed that Bt sweet corn products expressing the Viptera trait in the structured plantings were also highly effective for managing H. zea . Furthermore, laboratory, greenhouse, and limited field studies have suggested that Viptera Bt corn is extremely effective against S. frugiperda Yang et al, 2013;Niu et al, 2013Niu et al, , 2014Huang et al, 2014). Yang et al (2013) showed that in an F 2 screen on Viptera 3111 corn leaf tissue, all 14,400 F 2 neonates of 150 singe-pair families of S. frugiperda were killed within 7 days.…”

“…However the results of the current study, together with others, strongly suggest that Bt corn hybrids containing the Viptera trait (Vip3A þ Cry1Ab) likely produce a "high-dose" against both H. zea and S. frugiperda. These two noctuid species are two important targets of the second generation pyramided Bt corn in both North and South America (Burkness et al, 2011;Niu et al, 2013Niu et al, , 2014Farias et al, 2014).…”

Performance of Cry1A.105-selected fall armyworm (Lepidoptera: Noctuidae) on transgenic maize plants containing single or pyramided Bt genes

“…Relative to the single-gene Bt maize, these pyramided Bt maize products are usually more effective against some target pests, especially Noctuidae species such as the corn earworm (Helicoverpa zea [Boddie]) and S. frugiperda (Burkness et al, 2010;Niu et al, 2014;Yang et al, 2013Yang et al, , 2015. The widespread Cry1F resistance in S. frugiperda has sparked concerns about the durability of the pyramided Bt crops Bernardi et al, 2015;Santos-Amaya et al, 2015;Yang et al, 2016).…”

On-Plant Larval Movement and Feeding Behavior of Fall Armyworm (Lepidoptera: Noctuidae) on Reproductive Corn Stages

“…Information on pest movement, as well as larval feeding behavior, is important because the mobility of the insect could impact larval exposure to lethal and sublethal concentrations of Bt toxins in different plant tissues (Paula-Moraes et al 2012), thus influencing survival and the selection of insect resistance. This information will help in designing strategies to manage resistance (Gould 1998, Dirie et al 2000, especially in the case of Brazil, where unexpected survival and subsequent resistance of S. frugiperda on Cry1F and Cry1Ab corn has been reported in several regions (Farias et al 2014, Niu et al 2014, Monnerat et al 2015.…”