Searching for promising sources of grain protectors in extracts from Neotropical Annonaceae

Abstract

"To investigate potential sources of novel grain protector compounds against Sitophilu s zeamais (Coleoptera: Curculionidae), which is an important insect pest of stored cereals, this study evaluated the bioactivity of ethanolic extracts (66) prepared from 29 species belonging to 11 different genera of Neotropical Annonaceae. A screening ass ay demonstrated that the most pronounced bioactive effects on S. zeamais were caused by ethanolic extracts from Annona montana , A. mucosa , A. muricata , and A. sylvatica seeds, causing the death of all weevils exposed, almost complete inhibition of the F1 p rogeny and a drastic reduction in grain losses. Furthermore, the ethanolic extracts obtained from the leaves of A. montana , A. mucosa , A. muricata , and Duguetia lanceolata , especially A. montana and A. mucosa , demonstrated significant bioactive effects on the studied variables; however, the activity levels were less pronounced than in the seed extracts, and the response was dependent on the concentration used. This study is the first to report the activity of seconda ry metabolites from D. lanceolata on inse cts as well as the action of A. sylvatica on pests associated with stored grains."