Control the Corn Earworm in Grain Sorghum Heads1

1959 ◽  
Vol 52 (2) ◽  
pp. 338-339 ◽  
Author(s):  
Vernon M. Kirk
Keyword(s):  
Grain Sorghum ◽  
Corn Earworm

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.

Predation of Corn Earworm (Lepidoptera: Noctuidae) Eggs and Young Larvae by Orius insidiosus (Say) (Heteroptera: Anthocoridae) on Grain Sorghum in a Greenhouse

1994 ◽  
Vol 29 (1) ◽  
pp. 10-17 ◽  
Author(s):  
D. A. Jacobson ◽  
T. J. Kring
Keyword(s):  
Larval Density ◽  
Grain Sorghum ◽  
Corn Earworm ◽  
Fourth Instar ◽  
The Other ◽  
Orius Insidiosus ◽  
First Instar ◽  
Egg Density ◽  
Lepidoptera Noctuidae ◽  
Individual Adult

Individual adult, fourth- and second-instar Orius insidiosus (Say) were caged for 24 h on branches of grain sorghum panicles with combinations of 0, 2, or 4 corn earworm eggs and 0, 2, or 4 first instar earworms, excepting 0 eggs and 0 larvae. Individual adult O. insidiosus also were caged for 24 h with 2 second-instar corn earworms. In cages with corn earworm eggs and first instars, predation by all stages of O. insidiosus on one stage of corn earworm was not significantly influenced by the number of the other stage available. The number of corn earworm eggs shriveled or missing, indicative of predation by O. insidiosus, was highest for cages with O. insidiosus adults (65% for either egg density). In cages with fourth-instar O. insidiosus, the percentage of corn earworm egg shriveled or missing was 45% with 2 eggs available and 32% with 4 eggs available. At all densities of eggs, the number of eggs shriveled or missing in cages with second-instar O. insidiosus was not significantly higher than in control cages. The number of first-instar corn earworms shriveled or missing was highest with fourth-instar O. insidiosus (≈ 52% loss at either larval density). Approximately 47% of larvae at both densities were shriveled or missing in cages with adult O. insidiosus. As was the case with eggs, the number of corn earworm larvae shriveled or missing in cages with second-instar O. insidiosus was not significantly different from that for the controls. Predation on second-instar corn earworms by adult O. insidiosus was not significant.

Persistence and Efficacy of Four Nuclear Polyhedrosis Viruses for Corn Earworm (Lepidoptera: Noctuidae) on Heading Grain Sorghum

1994 ◽  
Vol 29 (3) ◽  
pp. 370-380 ◽  
Author(s):  
S. Y. Young ◽  
R. W. McNew
Keyword(s):  
Helicoverpa Zea ◽  
Heliothis Armigera ◽  
Grain Sorghum ◽  
Corn Earworm ◽  
Anticarsia Gemmatalis ◽  
Initial Activity ◽  
Larval Population ◽  
Commercial Preparation ◽  
Enveloped Virus ◽  
Nuclear Polyhedrosis

The persistence and efficacy of Helicoverpa zea nuclear polyhedrosis virus (HzNPV) on heading grain sorghum was compared with three multiply-enveloped NPV's from other hosts to which the corn earworm, Helicoverpa zea (Boddie), is susceptible. Bioassay of NPV by feeding florets from sprayed heads to second instar corn earworm showed only low levels of virus remaining on heads in all of the treatments four days after application. The initial activity and persistence of a commercial preparation of H. zea NPV were greater than four unformulated virus preparations including unformulated HzNPV at rates of 3, 6, and 15 × 1011 polyhedral inclusion bodies (PIB) per ml (P < 0.05). Initial activity and persistence were similar for unformulated preparations of HzNPV, Heliothis armigera (HaNPV), and Autographa californica (AcNPV). Activity and persistence of Anticarsia gemmatalis (AgNPV) were significantly less than for the other viruses (P < 0.05). In a small plot test on heading grain sorghum in which viruses were applied at 1.5, 3, and 6 × 1011 PIB/ha, mortality of collected corn earworm larvae and larval population reduction were greater in the HzNPV treatments than in the three multiply-enveloped virus treatments. HaNPV and AcNPV preparations were more effective than AgNPV. All virus preparations required one wk or longer to significantly reduce larval populations at all rates (P < 0.05).

scholarly journals EVALUATION OF INSECTICIDES AGAINST CORN EARWORM AND SORGUM WEBWORM IN GRAIN SORGHUM, 2009

2010 ◽  
Vol 35 (1) ◽  
Author(s):  
Joshua H. Temple ◽  
Fangneng Huang ◽  
Jarrod Hardke ◽  
Paul Price ◽  
Karla Emfinger ◽  
...  
Keyword(s):  
Grain Sorghum ◽  
Corn Earworm

Seasonal Abundance of Stink Bugs (Heteroptera: Pentatomidae) and Other Polyphagous Species in a Multi-Crop Environment in South Arkansas

2008 ◽  
Vol 43 (1) ◽  
pp. 1-12 ◽  
Author(s):  
John F. Smith ◽  
Randall G. Luttrell ◽  
Jeremy K. Greene
Keyword(s):  
Landscape Management ◽  
Grain Sorghum ◽  
Corn Earworm ◽  
Genetically Engineered ◽  
Tobacco Budworm ◽  
Seasonal Abundance ◽  
Stink Bug ◽  
Stink Bugs ◽  
Southern Green Stink Bug ◽  
Green Stink Bug

A 3-yr study was conducted to determine seasonal abundance of major pentatomid, noctuid, and mirid pests in a multicrop environment in south Arkansas. Replicated field plots (~0.1 ha) containing cotton, Gossypium hirsutum (L.), genetically engineered to express the Cry 1Ac toxin of Bacillus thuringiensis (Bt), nonBt cotton, Bt corn, Zea mays (L.), genetically engineered to express the Cry 1Ab toxin of B. thuringiensis, nonBt corn, maturity group (MG) III, IV, V, and VI soybean, Glycine max (L.) Merrill, and grain sorghum, Sorghum bicolor (L.) Moench, were planted each year. Crop preferences of 3 stink bug species [southern green stink bug, Nezara viridula (L.), green stink bug, Acrosternum hilare (Say), and brown stink bug, Euschistus servus (Say)] were recorded and observations also were made on the relative abundance of corn earworm, Helicoverpa zea (Boddie), tobacco budworm, Heliothis virescens (F.), and tarnished plant bug, Lygus lineolaris (Palisot de Beavois). Significantly higher densities of stink bugs were present in MG IV soybean than in all other crops in July and August during all 3 yrs of study. Densities of heliothines were significantly greater in grain sorghum and corn than in other crops during July. Tarnished plant bugs were most commonly observed in cotton. Preferences of these polyphagous pests for different crops at specific stages of phenological development appear to be predictable aspects of insect behavior that may be exploited in trap crops or other landscape management systems.

scholarly journals EFFICACY OF SELECTED INSECTICIDES FOR CONTROL OF CORN EARWORM AND SORGHUM WEBWORM IN GRAIN SORGHUM, 2011

2013 ◽  
Vol 38 (1) ◽  
Author(s):  
Ben Von Kanel ◽  
Angus L. Catchot ◽  
Lucas N. Owen ◽  
Joshua L. Jones ◽  
Brian P. Adams ◽  
...  
Keyword(s):  
Grain Sorghum ◽  
Corn Earworm ◽  
Sorghum Webworm
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