บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Influence of insect infestation on aflatoxin contamination of stored maize in four agroecological regions in Benin.

HELL, K., CARDWELL, K.F., SETAMOU, M. and SCHULTHESS, F.

African Entomology 8: 169 – 177.

2000

บทคัดย่อ

Influence of insect infestation on aflatoxin contamination of stored maize in four agroecological regions in Benin.

Insect species and damage levels were evaluated and related to aflatoxin content in maize sampled from farmers’ stores in four agroecological zones over a two year period in Benin, West – Africa. IN 1993, no aflatoxin was detected in maize that was free of insect damage. In the same year, in maize with more than 70% of cobs damaged by insects 30.3 % were positive for aflatoxin. The mean aflatoxin content of maize infested with Carpophilus dimidiatus Fabricius (Coleoptera) was significantly higher than maize frdd of this pest. In 1994-95, the density of Mussidia nigrivinella Ragonot (Lepidoptera), was significantly higher in the Northern Guinea Savanna than in the other zones, and the presence of this pest was positively correlatedwith the cob area visibly infected with Aspergillus flavus early in storage. Six months later, damage levels due to insects were significantly lower in the Sudan Savanna than in the other ecozones. The infestation level of the most common storage pest, Sitophilus zeamais Motschulsky (Coleoptera) decreased from the south to the north. After six months of storage aflatosin level was positively correlated with the cob area damaged by Sesamai calamistis Hampson (Lepidoptera), the number of Cryptophlebia leucotreta (Meyrick) (Lepidoptera) observed on maize and cob area damaged by S. zeamais.