Florida Entomologist (2013) 96, 701-713

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Ying Niu, Robert L. Meagher Jr., Fei Yang and Fangneng Huang (2013)
Susceptibility of field populations of the fall armyworm (Lepidoptera: Noctuidae) from Florida and Puerto Rico to purified Cry1f protein and corn leaf tissue containing single and pyramided Bt genes
Florida Entomologist 96 (3), 701-713
Abstract: Larval survival of Cry1F-susceptible (FL), -resistant (PR and Cry1F-RR), and -heterozygous (FL x PR and Cry1F-RS) populations of the fall armyworm, Spodoptera frugiperda (J. E. Smith) to purified Cry1F protein and corn leaf tissue of 7 Bacillus thuringiensis (Bt) corn hybrids and 5 non-Bt corn hybrids was evaluated in the laboratory. The 7 Bt corn hybrids represent 5 Bt corn traits: Herculex®I, which expresses a single Bt protein (Cry1F), and Genuity® VT Double Pro, VT Triple Pro, SmartStax, and Agrisure® Viptera® 3111, which contain ≥ 2 pyramided Bt genes. The original FL and PR populations were collected from corn fields in 2011 in Florida and Puerto Rico, respectively. Diet-incorporation bioassays showed that FL was susceptible to Cry1F protein with a LC50 value of 0.13-0.23 µg/g, while PR was highly resistant to Cry1F protein (> 137-fold). FL was also susceptible to all 7 Bt corn hybrids with a 7-day mortality of > 95%, while PR and a backcrossed and reselected population, Cry1F-RR, were highly resistant to Cry1F corn leaf tissue. The resistance was recessive or incompletely recessive. None of the 5 populations of S. frugiperda could survive on Viptera 3111, suggesting this Bt corn trait can completely overcome the resistance and thus should provide a means of managing Cry1F resistance in S. frugiperda. However, Cry1F-RR exhibited a significant cross-resistance to the leaf tissue of the other 3 pyramided Bt corn traits. The possible cross-resistance between single-gene and pyramided Bt corn products suggest that careful selection of Bt genes is essential in use of gene pyramiding strategy for resistance management.
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Full text of article
Database assignments for author(s): Fang Neng Huang

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
resistance/tolerance/defence of host


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Spodoptera frugiperda Maize/corn (Zea mays) Puerto Rico
Spodoptera frugiperda Maize/corn (Zea mays) U.S.A. (SE)
Bacillus thuringiensis Cry1F-toxin (entomopathogen) Spodoptera frugiperda Maize/corn (Zea mays)