of eradication policies when opium is used as a means of obtaining credit, and when the crops are produced in … sharecropping arrangements. The analysis suggests that when perfect credit markets are available, an increased risk of eradication … effects of eradication are no longer clear-cut. Finally, under sharecropping arrangements, increased risk of eradication will …

the models to the case study of Colorado potato beetle in the UK. The results demonstrate that eradication is optimal for … to smaller total overall costs of invasion and makes eradication optimal for larger sizes of initial invasion. In many …