Abstract
Eucalyptus trees are known to be very competitive, suppressing crops in such settings to the extent that crops fail in the field zones nearest the woodlots. On the other hand, farmers get firewood, timber and other wood products as well as income from sales of timber and firewood and prefer to retain these very competitive trees on their fields. Controversy about Eucalyptus in other areas led to policymakers restricting the growing Eucalyptus, especially lnear wet areas. This thesis aimed to study the interaction between Eucalyptus woodlot trees and crops in fields next to the woodlots in southern Rwanda.