Response of Four Commercial Corn Hybrids to Infestations of Fall Armyworm and Corn Earworm (Lepidoptera: Noctuidae)

1993 ◽  
Vol 76 (2) ◽  
pp. 283 ◽  
Author(s):  
B. R. Wiseman ◽  
D. J. Isenhour
Keyword(s):  
Fall Armyworm ◽  
Corn Earworm ◽  
Corn Hybrids ◽  
Lepidoptera Noctuidae

Evaluation of Bt Transgenic Sweet Corn Hybrids for Resistance to Corn Earworm and Fall Armyworm (Lepidoptera: Noctuidae) using a Meridic Diet Bioassay2

1999 ◽  
Vol 34 (4) ◽  
pp. 415-425 ◽  
Author(s):  
B. R. Wiseman ◽  
R. E. Lynch ◽  
D. Plaisted ◽  
D. Warnick
Keyword(s):  
Spodoptera Frugiperda ◽  
Helicoverpa Zea ◽  
Sweet Corn ◽  
Fall Armyworm ◽  
Corn Earworm ◽  
Laboratory Bioassay ◽  
Corn Hybrids ◽  
Pinto Bean ◽  
Highly Correlated ◽  
Lepidoptera Noctuidae

A laboratory bioassay was used to evaluate Bt transgenic sweet corn hybrids for resistance against the corn earworm, Helicoverpa zea (Boddie), and the fall armyworm, Spodoptera frugiperda (J. E. Smith). Whorl leaves, silks, and kernels, either fresh or oven-dried and ground with a mill, were incorporated into a dilute pinto bean diet and bioassayed against neonate, 3-, or 6-day-old larvae. Regardless of age of the larvae, results with the diet bioassay using fresh silks, oven-dried silks or fresh kernels were highly correlated with those for the fresh silk bioassay. Differences in susceptibility between insect species to the CrylA(b) toxin produced in the transgenic plants were also readily discernable using the diet bioassay. Based on results of the bioassays, Novartis sweet corn hybrids containing a crylA(b) gene gene for δ-endotoxin production were very highly resistant to leaf, silk and kernel feeding by the corn earworm and highly resistant to leaf and silk feeding by the fall armyworm.

Relationship Between Growth of Corn Earworm and Fall Armyworm Larvae (Lepidoptera: Noctuidae) and Maysin Concentration in Corn Silks

1992 ◽  
Vol 85 (6) ◽  
pp. 2473-2477 ◽  
Author(s):  
B. R. Wiseman ◽  
M. E. Snook ◽  
D. J. Isenhour ◽  
J. A. Mihm ◽  
N. W. Widstrom
Keyword(s):  
Fall Armyworm ◽  
Corn Earworm ◽  
Lepidoptera Noctuidae

Compatibility of Nuclear Polyhedrosis Viruses and Inherited Sterility for Control of Corn Earworm and Fall Armyworm (Lepidoptera: Noctuidae)

1997 ◽  
Vol 32 (2) ◽  
pp. 148-153 ◽  
Author(s):  
J. J. Hamm ◽  
J. E. Carpenter
Keyword(s):  
Helicoverpa Zea ◽  
Nuclear Polyhedrosis Virus ◽  
Fall Armyworm ◽  
Corn Earworm ◽  
Management Approach ◽  
Significant Difference ◽  
Polyhedrosis Virus ◽  
Nuclear Polyhedrosis ◽  
Lepidoptera Noctuidae ◽  
Inherited Sterility

Inherited sterility has been proposed as a means of suppressing the populations of the corn earworm, Helicoverpa zea (Boddie), and the fall armyworm, Spodoptera frugiperda (J. E. Smith). If nuclear polyhedrosis viruses could be used to kill larvae, thereby reducing the number of moths in the field populations, fewer moths treated with substerilizing doses of irradiation would need to be released. However, for these two methods to be compatible, the progeny of substerile moths should be no more susceptible to the virus than the progeny of the field populations. The corn earworm nuclear polyhedrosis virus (Elcar™) was bioassayed against corn earworm larvae from untreated moths and larvae from male, female, and male and female moths treated with 100 Gy of irradiation and larvae from male moths treated with 150 Gy of irradiation. The fall armyworm nuclear polyhedrosis virus was bioassayed against fall armyworm larvae from untreated moths and larvae from male moths treated with 100 to 150 Gy of irradiation. There was no significant difference between susceptibility of larvae from untreated moths and larvae from irradiated moths. Thus, the use of nuclear polyhedrosis viruses for control of larvae should be compatible with the release of substerilized moths as part of an integrated pest management approach for area-wide management of the corn earworm and fall armyworm.

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