Grain Sorghum Response to Fall Armyworm and Corn Earworm Infestation

1991 ◽  
Vol 84 (2) ◽  
pp. 619-624 ◽  
Author(s):  
J. R. Chamberlin ◽  
J. N. All
Keyword(s):  
Fall Armyworm ◽  
Grain Sorghum ◽  
Corn Earworm

scholarly journals EFFICACY OF SELECTED INSECTICIDES AGAINST CORN EARWORM AND FALL ARMYWORM IN GRAIN SORGHUM, 2010

2011 ◽  
Vol 36 (1) ◽  
Author(s):  
James W. McPherson ◽  
Angus L. Catchot ◽  
Lucas N. Owen ◽  
Joshua L. Jones ◽  
Brian P. Adams ◽  
...  
Keyword(s):  
Fall Armyworm ◽  
Grain Sorghum ◽  
Corn Earworm

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

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.

Influence of Panicle Maturity on Infestation of Grain Sorghum by Corn Earworm and Sorghum Webworm (Lepidoptera: Noctuidae) in Georgia

1991 ◽  
Vol 26 (4) ◽  
pp. 419-424
Author(s):  
J. R. Chamberlin ◽  
J. N. All
Keyword(s):  
Helicoverpa Zea ◽  
Paired Comparison ◽  
Larval Density ◽  
Field Tests ◽  
Grain Sorghum ◽  
Corn Earworm ◽  
Egg Parasitism ◽  
Low Levels ◽  
Sorghum Webworm ◽  
Lepidoptera Noctuidae

The influence of panicle maturity on oviposition by the corn earworm, Helicoverpa zea (Boddie), and sorghum webworm, Celama sorghiella (Riley), was investigated on grain sorghum in Georgia during 1986 and 1987. Stage of panicle development, density of corn earworm and sorghum webworm, and egg parasitism by Trichogramma spp. were recorded at 2–3 day intervals in three field tests. Sorghum webworm and corn earworm began oviposition as panicles emerged from the boot. Oviposition peaked 4–8 days later, near the time panicles began anthesis, but then declined quite rapidly. Oviposition by sorghum webworm ceased approximately 10–12 days after panicle emergence began. Corn earworm oviposition continued at low levels until sampling was terminated 14 - 17 days after panicles began emgergence. Rainfall appeared to mediate effects of panicle maturity on oviposition. Corresponding peaks in larval density were not observed for corn earworm or sorghum webworm, possibly because of heavy parasitism by Trichogramma spp. A paired comparison procedure was used to determine preference of small, medium, and large corn earworm larvae for panicles of different maturity. Early instars preferred newly flowered panicles and concentrated feeding on pollen filled anthers. Late instars preferred panicles in the soft-hard dough stages, while intermediate instars exhibited no significant preference. These data suggest that corn earworm oviposition is concentrated at anthesis because pollen enhances larval development and survival.

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