scholarly journals Assessment of Experimental Bt Events Against Fall Armyworm and Corn Earworm in Field Corn

2004 ◽  
Vol 97 (2) ◽  
pp. 259-264 ◽  
Author(s):  
G. David Buntin ◽  
Kathy L. Flanders ◽  
Robert E. Lynch
Keyword(s):  
Fall Armyworm ◽  
Corn Earworm ◽  
Field Corn

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.

Distribution of Fall Armyworm Larvae. 1. Regions of Field Corn Plants Infested by Larvae 1

1973 ◽  
Vol 2 (2) ◽  
pp. 195-198 ◽  
Author(s):  
Wendell L. Morrill ◽  
G. L. Greene
Keyword(s):  
Fall Armyworm ◽  
Field Corn ◽  
Corn Plants

Natural Resistance of Native and Commercial Maize to Fall Armyworm, Spodoptera frugiperda, and Corn Earworm, Helicoverpa zea1, and Their Relationship with Ear Rot

2021 ◽  
Vol 46 (4) ◽  
Author(s):  
José Luis Arispe-Vázquez ◽  
Luis Alberto Aguirre-Uribe ◽  
Epifanio Castro-Del Ángel ◽  
Yisa María Ochoa-Fuentes ◽  
Ernesto Cerna-Chávez ◽  
...  
Keyword(s):  
Spodoptera Frugiperda ◽  
Fall Armyworm ◽  
Corn Earworm ◽  
Natural Resistance ◽  
Ear Rot

Effects of Bacillus thuringiensis Transgenic Corn on Corn Earworm and Fall Armyworm (Lepidoptera: Noctuidae) Densities

2007 ◽  
Vol 100 (2) ◽  
pp. 327-334 ◽  
Author(s):  
C. F. Chilcutt ◽  
G. N. Odvody ◽  
J. Carlos Correa ◽  
J. Remmers
Keyword(s):  
Bacillus Thuringiensis ◽  
Fall Armyworm ◽  
Corn Earworm ◽  
Transgenic Corn ◽  
Lepidoptera Noctuidae

Use of Rubidium to Label Corn Earworm 1 and Fall Armyworm 1 for Dispersal Studies 23

1978 ◽  
Vol 7 (3) ◽  
pp. 435-438 ◽  
Author(s):  
H. M. Graham ◽  
D. A. Wolfenbarger ◽  
J. R. Nosky ◽  
N. S. Hernandez ◽  
J. R. Llanes ◽  
...  
Keyword(s):  
Fall Armyworm ◽  
Corn Earworm

Behavioral Interactions Between the Hyperparasitoid Mesochorus discitergus (Hymenoptera: Ichneumonidae) and Four Species of Noctuid Caterpillars: Evasive Tactics and Capture Efficiency

1994 ◽  
Vol 29 (3) ◽  
pp. 420-427 ◽  
Author(s):  
M. E. Baur ◽  
K. V. Yeargan
Keyword(s):  
Spodoptera Frugiperda ◽  
Helicoverpa Zea ◽  
Fall Armyworm ◽  
Corn Earworm ◽  
Fourth Instar ◽  
Capture Efficiency ◽  
Behavioral Interactions ◽  
Lepidopteran Larvae ◽  
Noctuid Species ◽  
Soybean Looper

The hyperparasitoid, Mesochorus discitergus (Say), oviposits into larvae of primary parasitoids while the latter are developing inside various lepidopteran hosts. To accomplish hyperparasitism, M. discitergus must capture the lepidopteran larvae. We studied the evasive behaviors of 2nd-, 3rd-, and 4th instar Helicoverpa zea (Boddie) (corn earworm), Pseudoplusia includens (Walker) (soybean looper), Spodoptera frugiperda (J. E. Smith) (fall armyworm), and 2nd- and 4th-instar Plathypena scabra (Fabricius) (green cloverworm), as well as the effectiveness of these tactics in eluding capture by M. discitergus females. Most individuals of all instars of corn earworm and fall armyworm made minimal efforts to escape. Although not commonly used by corn earworm and fall armyworm, their occasional vigorous responses were effective in deterring M. discitergus females. Dropping from a leaf, either unattached or attached by a thread, was also effective for preventing capture of those two noctuid species. Soybean loopers and green cloverworms responded much more actively. Second-instars of both species dropped off the leaf on a thread, while 3rd- and 4th-instar soybean loopers commonly used vigorous responses. Fourth-instar green cloverworms used vigorous responses and dropping off the leaf. Overall, 68% of the caterpillars using the vigorous response were captured, while 39% of those dropping on a thread and about 26% of those dropping off a leaf, unattached by a thread, were captured. Green cloverworms and soybean loopers were more difficult to capture than corn earworms and fall armyworms.

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