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Trends in Entomology   Volumes    Volume 14 
Growing degree-days accumulation and phenological stages of the maize billbug [Sphenophorus maidis (Chittenden)] in eastern gamagrass [Tripsacum dactyloides (L.) L.]
Kundan Dhakal, Tim L. Springer
Pages: 71 - 77
Number of pages: 7
Trends in Entomology
Volume 14 

Copyright © 2018 Research Trends. All rights reserved

The maize billbug [Sphenophoris maidis (Chittenden)] feeds on eastern gamagrass [Tripsacum dactyloides (L.) L.] causing economic damage. The incidence of maize billbug was studied in a six-year-old eastern gamagrass field plot, and cumulative growing degree-days (cGDD) were calculated for the morphological stages of the pest for two years. The adult population was more abundant and distributed throughout the year compared to larvae and pupae. On the basis of growing degree-days, the 99% quantile for larvae, pupae, and adult maize billbug population was estimated between 1396-1908 cGDD. Very few pupae were recovered from field sampling, which may be due to its short pupation period and weekly sampling interval. Findings of this study will be helpful to formulate sustainable maize billbug management strategies.
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