scholarly journals Corn Germplasm Evaluated for Resistance to Fall Armyworm and Southwestern Corn Borer

1997 ◽  
Vol 22 (1) ◽  
pp. 427-428
Author(s):  
W. Paul Williams ◽  
Frank M. Davis
Keyword(s):  
Fall Armyworm ◽  
Plant Introduction ◽  
Feeding Damage ◽  
Germplasm Enhancement ◽  
Corn Borer ◽  
Southwestern Corn Borer ◽  
The U.S

Abstract As a part of the U.S. Germplasm Enhancement-Maize Project, 47 accessions from the Plant Introduction Station, Ames, IA, were evaluated for resistance to fall armyworm and southwestern corn borer leaf feeding at Mississippi State, MS. The accessions and known resistant and susceptible check hybrids were grown in one-row, 20-plant plots arranged in a RCB design with three replications for each insect. Plants in the mid-whorl stage of growth were infested with 30 neonates each approximately 6 wk after planting. Leaf feeding damage was visually rated 14 d later on a scale of 0 (no damage) to 9 (heavy dam-age).

scholarly journals Genetic Basis of Resistance to Fall Armyworm (Lepidoptera: Noctuidae) and Southwestern Corn Borer (Lepidoptera: Crambidae) Leaf-Feeding Damage in Maize

2007 ◽  
Vol 100 (4) ◽  
pp. 1470-1475 ◽  
Author(s):  
Thomas D. Brooks ◽  
B. Shaun Bushman ◽  
W. Paul Williams ◽  
Micheal D. McMullen ◽  
Paul M. Buckley
Keyword(s):  
Genetic Basis ◽  
Fall Armyworm ◽  
Feeding Damage ◽  
Corn Borer ◽  
Southwestern Corn Borer ◽  
Lepidoptera Noctuidae

Quantitative Trait Loci Conferring Resistance to Fall Armyworm and Southwestern Corn Borer Leaf Feeding Damage

Crop Science ◽  
2005 ◽  
Vol 45 (6) ◽  
pp. 2430-2434 ◽  
Author(s):  
Thomas D. Brooks ◽  
Martha C. Willcox ◽  
W. Paul Williams ◽  
Paul M. Buckley
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Fall Armyworm ◽  
Feeding Damage ◽  
Corn Borer ◽  
Trait Loci ◽  
Southwestern Corn Borer

Ear Pests and Damage to Organic, Conventional and Bt-Protected Sweet Corn Grown in Central Kentucky

2009 ◽  
Vol 44 (4) ◽  
pp. 383-390
Author(s):  
John D. Sedlacek ◽  
Karen L. Friley ◽  
Steve L. Hillman
Keyword(s):  
Helicoverpa Zea ◽  
European Corn Borer ◽  
Sweet Corn ◽  
Crop Protection ◽  
Fall Armyworm ◽  
Corn Earworm ◽  
Genetically Engineered ◽  
Corn Borer ◽  
Sap Beetles ◽  
Southwestern Corn Borer

Sweet corn (Zea mays L. var. rugosa) was grown in replicated plots in 2004 and 2006 using organic, conventional, and genetically-engineered (Bt) production practices. Organic plots were treated with Entrust® (Dow AgroSciences LLC, Indianapolis, IN) whereas conventional and Bt sweet corn plots were treated with Warrior® (Syngenta Crop Protection, Inc., Greensboro, NC). All plots were treated once at silk emergence. Organic and conventional plots were treated again 1 wk later. Twenty-five ears were harvested from row centers in each treatment subplot to quantify ear pests and assess ear damage. The highest number of corn earworm, Helicoverpa zea (Boddie), larvae were found on organically-grown sweet corn. European corn borer, Ostrinia nubilalis (Hübner); southwestern corn borer, Diatraea grandiosella Dyar; and fall armyworm, Spodoptera frugiperda (J.E. Smith), larvae were not found as frequently. Neither corn earworm nor European corn borer larvae were found on Bt sweet corn ears. Sap beetles, Carpophilus lugubris Murray, were found on all 3 types of sweet corn. Organically and conventionally-grown sweet corn had a greater number of tip-damaged ears and numbers of damaged kernels per ear than Bt sweet corn. Ear length and weight were the same for all 3 types of sweet corn. Based on the information generated in this study, growing late-planted sweet corn organically or conventionally on a large commercial scale with a limited spray program and without using other types of ear pest management does not appear to be a practical or profitable option in central Kentucky.

Field Resistance of Bacillus thuringiensis Berliner Transformed Maize to Fall Armyworm (Lepidoptera: Noctuidae) and Southwestern Corn Borer (Lepidoptera: Crambidae) Leaf Feeding

2004 ◽  
Vol 39 (3) ◽  
pp. 325-336 ◽  
Author(s):  
Craig A. Abel ◽  
Melanie C. Pollan
Keyword(s):  
Bacillus Thuringiensis ◽  
Fall Armyworm ◽  
Field Resistance ◽  
Economic Damage ◽  
Yield Reduction ◽  
Insecticidal Proteins ◽  
Corn Borer ◽  
Field Efficacy ◽  
Southwestern Corn Borer ◽  
Hybrid Maize

The fall armyworm, Spodoptera frugiperda (J. E. Smith), and the southwestern corn borer, Diatraea grandiosella (Dyar), can cause economic damage to maize, Zea mays L., grown in the southeastern United States. Maize hybrids are commercially available that have been transformed to express insecticidal crystalline proteins from Bacillus thuringiensis (Bt) Berliner. The field efficacy of seven Bt hybrids were tested for control of leaf-feeding fall armyworm and southwestern corn borer. All Bt hybrids performed better than their conventional near-isolines for control of both insects. In general, the Bt hybrids provided intermediate resistance to the fall armyworm and near immunity to the southwestern corn borer. Based on larval establishment and weights, the fall armyworm was more tolerant of the insecticidal proteins expressed by the Bt hybrids than the southwestern corn borer. There was no difference in expression of insecticidal proteins among the Bt hybrids. Bt hybrids should be advantageous for the production of maize in areas that are affected by southwestern corn borer. The moderate level of resistance in the Bt hybrids to fall armyworm should be further examined to determine if amplifying the expression of insecticidal proteins or integrating other control methods along with the use of current Bt hybrid maize is needed to protect the crop from yield reduction by this pest.

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