scholarly journals CONTROL OF FALL ARMYWORM AND CORN EARWORM WITH SELECTED BT-CORN HYBRIDS, 1999

2000 ◽  
Vol 25 (1) ◽  
Author(s):  
T. J. Riley ◽  
B. A. Castro ◽  
J. Rabb
Keyword(s):  
Fall Armyworm ◽  
Corn Earworm ◽  
Bt Corn ◽  
Corn Hybrids

scholarly journals EVALUATION OF SELECTED BT CORN HYBRIDS AGAINST CORN EARWORM AND FALL ARMYWORM, 1998

1999 ◽  
Vol 24 (1) ◽  
Author(s):  
T. J. Riley ◽  
B. A. Castro ◽  
C. Cálix ◽  
J. Rabb
Keyword(s):  
Fall Armyworm ◽  
Corn Earworm ◽  
Bt Corn ◽  
Corn Hybrids

Influence of Transgenic Corn Expressing Insecticidal Protein of Bacillus thuringiensis Berliner on Natural Populations of Corn Earworm (Lepidoptera: Noctuidae) and Southwestern Corn Borer (Lepidoptera: Crambidae)

2006 ◽  
Vol 41 (3) ◽  
pp. 221-231 ◽  
Author(s):  
Kerry C. Allen ◽  
Henry N. Pitre
Keyword(s):  
Bacillus Thuringiensis ◽  
Helicoverpa Zea ◽  
Larval Growth ◽  
Natural Populations ◽  
Corn Earworm ◽  
Bt Corn ◽  
Transgenic Corn ◽  
Diatraea Grandiosella ◽  
Corn Hybrids ◽  
Corn Borer

A 2-yr study was conducted to measure the influence of transgenic corn, Zea mays L., expressing the CrylAb endotoxin of Bacillus thuringiensis (Berliner) (Bt) by means of Event MON810 on natural populations of Helicoverpa zea (Boddie) and Diatraea grandiosella (Dyar). The studies were conducted at Leland and Morgan City, MS, in 1999 and at Morgan City in 2000. Although total numbers of H. zea larvae were not significantly different on transgenic corn hybrids compared with their near-isogenic parent lines, fewer large larvae were found on the transgenic hybrids. Differences in H. zea larval growth were noticeable when larvae fed on Bt corn vs non-Bt corn. The delay in larval growth for insects within a single generation, which could possibly result in asynchronous mating between insecticide resistant and susceptible insects, was observed for larvae feeding on plants expressing the Bt toxin. Diatraea grandiosella caused limited damage to the transgenic corn hybrids compared with their near-isogenic parent lines. Yields were not significantly greater for the Bt corn hybrids compared with their near-isogenic parent lines. Yields were not significantly greater for the Bt corn hybrids compared with the near-isogenic, non-Bt corn parents; however, there was a trend toward higher yields for Bt hybrids compared with their near-isogenic non-Bt parents.

scholarly journals Performance of Selected Bt Corn Hybrids/Technologies Against Corn Earworm, 2016

2020 ◽  
Vol 45 (1) ◽  
Author(s):  
Donald R Cook ◽  
Jeffrey Gore ◽  
Whitney Crow
Keyword(s):  
Corn Earworm ◽  
Bt Corn ◽  
Corn Hybrids

scholarly journals EVALUATION OF SELECTED BT CORN HYBRIDS (MON810) FOR CONTROL OF CORN EARWORM, 2001

2002 ◽  
Vol 27 (1) ◽  
pp. M3-M3
Author(s):  
T. J. Riley ◽  
B. A. Castro ◽  
J. Liscano ◽  
J. Rabb
Keyword(s):  
Corn Earworm ◽  
Bt Corn ◽  
Corn Hybrids

Evaluation of Insecticide Thresholds in Late-Planted Bt and Non-Bt Corn for Management of Fall Armyworm (Lepidoptera: Noctuidae)

2020 ◽  
Vol 113 (2) ◽  
pp. 814-823
Author(s):  
Tom R Bilbo ◽  
Francis P F Reay-Jones ◽  
Jeremy K Greene
Keyword(s):  
South Carolina ◽  
Helicoverpa Zea ◽  
Management Strategies ◽  
Fall Armyworm ◽  
Field Trials ◽  
Bt Corn ◽  
Significant Protection ◽  
Corn Hybrids ◽  
Field Corn ◽  
Development Of Resistance

Abstract The fall armyworm, Spodoptera frugiperda (J. E. Smith), is a major pest of corn in North and South America. It is managed primarily with transgenic corn-producing insecticidal proteins of Bacillus thuringiensis (Bt), but the development of resistance threatens their durability and necessitates the use of alternative management strategies. We conducted late-planted field trials during 2016 and 2017 in South Carolina using natural infestations. We evaluated the use of Bt and non-Bt corn hybrids in combination with foliar applications of chlorantraniliprole at varying infestation thresholds to protect field corn from infestation and damage and determine effects on grain yield. All Bt hybrids were more effective at reducing fall armyworm infestation rates and leaf injury than multiple insecticide sprays, and no Bt hybrid reached the lowest infestation threshold (20%) to require supplemental insecticide treatments, despite infestations in non-Bt corn reaching >68% in each year. The only Bt and/or insecticide treatment to significantly reduce ear feeding or the proportion of ears injured (mainly by Helicoverpa zea [Boddie]) was the Bt hybrid pyramid producing Vip3A. However, significant protection of yield was detected only in the Bt hybrids producing Cry1A.105 + Cry2Ab2. All Bt traits tested in this study were effective in reducing infestation and feeding damage from fall armyworm, although this did not always result in significant protection of yield. Our results demonstrate the potential and limitations of using chlorantraniliprole with Bt (when resistance is present) and non-Bt corn to manage this pest.

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.

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