ASSESSMENT OF GRAIN YIELD LOSSES IN PEARL MILLET DUE TO THE MILLET STEMBORER, CONIESTA IGNEFUSALIS (HAMPSON)

Publication Year:
2003
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Downloads 689
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Repository URL:
http://digitalcommons.unl.edu/entomologyfacpub/328
Author(s):
Drame-Yaye, Aissetou; Youm, Ousmane; Ayertey, Jonathan N.
Tags:
Coniesta ignefusalis; stemborer; millet; Pennisetum; yield loss; West Africa; Entomology
article description
Studies were conducted at the ICRISAT Sahelian Centre, Niger, to assess damage and yield loss by the millet stemborer, Coniesta ignefusalis (Lepidoptera: Pyralidae) on Pennisetum glaucum (L.) R. Brown. Although 78% of stems were infested, late attack by the millet stemborer on millet plants resulted in bored stems yielding more than unbored ones. Artificial infestations with 5 and 10 larvae per plant at 2 weeks after plant emergence (WAE) resulted in 50 to 70% plants with deadhearts and 24 to 100% avoidable yield loss. At 4 weeks after plant emergence, infestations with 5 larvae and 10 larvae per plant resulted in 7% increase in yield and 16% yield loss, respectively. Therefore, both the age of plant and density of borer population at the time of infestation can influence resulting stemborer damage and yield loss on pearl millet.