@ARTICLE {SCHULTHESS:1989,
title = {Sampling Phenacoccus manihoti in cassava fields in Nigeria},
author = {Schulthess, F. and Baumgaertner, J. U. and Herren, H. R. },
journal = {Tropical Pest Management},
year = {1989},
volume = {35},
pages = {193--200},
}