Capture of Corn Earworm (Lepidoptera: Noctuidae) in Pheromone Traps and Hand Nets: Relationship to Egg and Adult Densities in Field Corn, Texas Brazos River Valley

1993 ◽  
Vol 86 (2) ◽  
pp. 407-415 ◽  
Author(s):  
M. A. Latheef ◽  
J. D. Lopez ◽  
J. A. Witz
Keyword(s):  
Corn Earworm ◽  
River Valley ◽  
Pheromone Traps ◽  
Brazos River ◽  
Field Corn ◽  
Lepidoptera Noctuidae

Serological Determination of Carabid (Coleoptera: Adephaga) Predation of Corn Earworm (Lepidoptera: Noctuidae) in Field Corn 1

1982 ◽  
Vol 11 (6) ◽  
pp. 1183-1186 ◽  
Author(s):  
Don S. Lesiewicz ◽  
Jeanne L. Lesiewicz ◽  
J. R. Bradley ◽  
John W. Van Duyn
Keyword(s):  
Corn Earworm ◽  
Field Corn ◽  
Lepidoptera Noctuidae

scholarly journals Impact of Simulated Corn Earworm (Lepidoptera: Noctuidae) Kernel Feeding on Field Corn Yield

2019 ◽  
Vol 112 (5) ◽  
pp. 2193-2198 ◽  
Author(s):  
B M Olivi ◽  
J Gore ◽  
F M Musser ◽  
A L Catchot ◽  
D R Cook
Keyword(s):  
Helicoverpa Zea ◽  
Zea Mays L ◽  
Corn Earworm ◽  
Corn Yield ◽  
Corn Hybrids ◽  
Field Corn ◽  
Lepidoptera Noctuidae ◽  
Economic Pest ◽  
Harvest Method ◽  
Study Manual

Abstract Corn earworm, Helicoverpa zea (Boddie) Lepidoptera: Noctuidae, has not been considered an economic pest of field corn. Historical losses estimates ranged from 1.5 to 2.5%, and a large number of foliar insecticide applications would be needed to minimize infestations. In recent years, Bt, Bacillus thuringiensis (Berliner) field corn, Zea mays (L.) Poales: Poaceae, technologies that exhibit activity against corn earworm have been introduced. However, it is unclear how much damage to corn ears (number of damaged kernels) is required to reduce yield. In this study manual damage methods were utilized to inflict defined levels of kernel damage and to impose damage at levels greater than observed with natural corn earworm infestations. Bt corn hybrids expressing the Agrisure Viptera (Vip 3A) trait were used to minimize injury from natural infestations of corn earworm. Manual kernel damage was imposed at R3 stage to mimic corn earworm feeding while avoiding interference with pollination. These methods were used in experiments where treatments were applied to individual ears and hand-harvested and in experiments where treatments were applied to all primary ears in the plot and machine-harvested. Damage of ≥60 kernels per ear was required to significantly reduce yield regardless of harvest method. Kernel damage from natural corn earworm infestations reported in other studies was much lower than 60 kernels per ear. Timely planting is a key component of all integrated pest management programs. Field corn planted during the recommended planting window for optimum yield is unlikely to experience corn earworm damage great enough to reduce yield.

RELATIONSHIPS AMONG PHEROMONE TRAP CATCHES OF MALE CORN EARWORM MOTHS (LEPIDOPTERA: NOCTUIDAE), EGG NUMBERS, AND PHENOLOGY IN CORN

1991 ◽  
Vol 123 (2) ◽  
pp. 271-281 ◽  
Author(s):  
M.A. Latheef ◽  
J.A. Witz ◽  
J.D. Lopez
Keyword(s):  
Cross Correlation ◽  
Pheromone Trap ◽  
Corn Earworm ◽  
Pheromone Traps ◽  
Mediating Effects ◽  
Large Numbers ◽  
Cross Correlation Analysis ◽  
Time Differential ◽  
Trap Catches ◽  
Lepidoptera Noctuidae

AbstractRelationships among catches of corn earworm moths, Helicoverpa (= Heliothis) zea (Boddie), in pheromone traps, numbers of corn earworm eggs, and corn ears with fresh silks were investigated in eight corn fields during a 2-year period in Brazos River Valley, Texas. Cross-correlation analysis indicated that the catches of corn earworm moths in pheromone traps were closely associated with egg numbers in seven of eight fields with a time differential varying between −1 to +2 days. Cross-correlation peaks for new silks versus eggs occurred with time differentials being mostly positive, indicating that corn earworm egg numbers reached a maximum after corn produced large numbers of fresh silks on ears.There was a weak but significant linear relationship between egg numbers and corn earworm catches in pheromone traps when corn was in the whorl stage of growth. A stepwise regression model of the form: log (eggs/ha + 1) = 3.71 + 0.22*log(S + 1)*log(T + 1) − 0.3*log(S + 1), where S = numbers of corn ears with new silks per hectare, and T = mean corn earworm moths per trap, explained 52.5% of the variance. These results emphasize the mediating effects of fresh silks on corn earworm oviposition on corn.

Corn Earworm (Lepidoptera: Noctuidae) in Northeastern Field Corn: Infestation Levels and the Value of Transgenic Hybrids

2013 ◽  
Vol 106 (3) ◽  
pp. 1250-1259 ◽  
Author(s):  
Eric Bohnenblust ◽  
Jim Breining ◽  
Shelby Fleischer ◽  
Gregory Roth ◽  
John Tooker
Keyword(s):  
Corn Earworm ◽  
Field Corn ◽  
Lepidoptera Noctuidae

Impact of Corn Earworm (Lepidoptera: Noctuidae) on Field Corn (Poales: Poaceae) Yield and Grain Quality

2018 ◽  
Vol 111 (3) ◽  
pp. 1249-1255 ◽  
Author(s):  
Jenny L Bibb ◽  
Donald Cook ◽  
Angus Catchot ◽  
Fred Musser ◽  
Scott D Stewart ◽  
...  
Keyword(s):  
Grain Quality ◽  
Corn Earworm ◽  
Field Corn ◽  
Lepidoptera Noctuidae

scholarly journals Pest Status and Management of Corn Earworm (Lepidoptera: Noctuidae) in Field Corn in the United States

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Francis P F Reay-Jones
Keyword(s):  
United States ◽  
Selection Pressure ◽  
The United States ◽  
Corn Earworm ◽  
Bt Corn ◽  
Pest Status ◽  
Field Corn ◽  
Type Of Injury ◽  
The Impact ◽  
Economic Pest

Abstract The corn earworm, Helicoverpa zea (Boddie), is a common lepidopteran pest of corn (Zea mays L.) in the United States. This article provides an overview of the life history, ecology, plant injury, and management of H. zea in corn. Leaf injury by H. zea feeding can occur in vegetative stage corn, though this type of injury is rare. The most common type of injury is caused by larval feeding in ears. Because kernel injury is typically limited to the tip of the ear, H. zea is generally not considered an economic pest. The use of transgenic corn hybrids expressing insecticidal Cry proteins from Bacillus thuringiensis (Bt) Berliner can reduce injury from H. zea, though complete control is not achieved with most Bt traits. Resistance has been reported to several Bt toxins. Because H. zea is a major economic pest in cotton (Gossypium hirsutum L.) and because H. zea moths that developed on corn can migrate to cotton, selection pressure on H. zea in Bt corn has major implications for the pest status and injury to Bt cotton. Although the impact of H. zea on yield of field corn is generally negligible, the selection pressure exerted by Bt corn has led to management issues in cotton.

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