1. Insecticides of plant origin;Arnason,1989
2. Insect management for food storage and processing;Baur,1992
3. Opportunities and challenges for IPM in developing countries;Bergvinson,2004
4. Global strategies to control maize pests;Bergvinson,2006
5. FAO (2014). Statistical database. Rome, Italy. Electronic page http://faostat.fao.org.