บทคัดย่องานวิจัย

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Monitoring and modeling of field infestation and damage by the maize ear borer Mussidia nigrivenella (Lepidoptera: Pyralidae) in Benin, West Africa.

Setamou, M.; Schulthess, F.; Poehling, H. M.; Borgemeister, C.;

Journal of Economic Entomology Year: 2000 Vol: 93 Issue: 3 Pages: 650-657 Ref: 20 ref.

2000

บทคัดย่อ

Monitoring and modeling of field infestation and damage by the maize ear borer Mussidia nigrivenella (Lepidoptera: Pyralidae) in Benin, West Africa.

In many countries in West Africa, the pyralid ear borer Mussidia nigrivenella occasionally causes severe damage to pre- and postharvest maize. Between 1992 and 1995, the distribution of, and damage caused by M. nigrivenella were studied in Benin, West Africa using survey data and an on-station field experiment. The borer was distributed across the whole country, and at maturity an average 25% of the ears sampled in maize fields were infested. Damage levels varied with agro-ecological zones and were highest in the Guinea Savannas. However, borer-related yield losses were comparatively low. Three applications of cypermethrin over the growing season did not provide sufficient control in the on-station field experiment. A model was developed to estimate maize losses caused by M. nigrivenella, using the percentage of infested ears, which explained 93% of the variance. Extrapolation of field data indicated a 25% yield loss once a 100% infestation of maize ears was reached. For surveys in maize fields,

 the model is a valid tool for a rapid assessment of crop losses caused by M. nigrivenella.