Effect of Sorghum Webworm on Yield of Grain Sorghum in Oklahoma12

1967 ◽  
Vol 60 (1) ◽  
pp. 118-121
Author(s):  
H. G. Kinzer ◽  
C. F. Henderson
1991 ◽  
Vol 26 (4) ◽  
pp. 419-424
Author(s):  
J. R. Chamberlin ◽  
J. N. All

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.


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

2013 ◽  
Vol 38 (1) ◽  
Author(s):  
Brian P. Adams ◽  
Angus L. Catchot ◽  
Ben Von Kanel ◽  
Dung Bao ◽  
Jenny Bibb ◽  
...  

2007 ◽  
Vol 1 (1) ◽  
pp. 64-65
Author(s):  
I. M. Dweikat ◽  
J. F. Rajewski ◽  
J. D. Eastin

2015 ◽  
Vol 9 (2) ◽  
pp. 244-248
Author(s):  
R. Perumal ◽  
T. Tesso ◽  
K. D. Kofoid ◽  
P. V. V. Prasad ◽  
R. M. Aiken ◽  
...  
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