Weed management: a need for ecological approaches - Ecological Management of Agricultural Weeds - page 39

Welsh, R.(1999). The Economics of Organic Grain and Soybean Production in the Midwestern United
States. Greenbelt, MD: Henry A.Wallace Institute for Alternative Agriculture.
Wigle, D.T., Semenciw, R.M.,Wilkins, K., Riedel, D., Ritter, L., Morrison, H.I., & Mao,Y.
(1990).Mortality study of Canadian male farm operators: non-Hodgkin's
lymphoma mortality and agricultural practices in Saskatchewan. Journal of the
National Cancer Institute ,82, 575-82.
World Health Organization (1990) Public Health Impacts of Pesticides Used in Agriculture .
Geneva, Switzerland: World Health Organization.
Wrubel, R.P., & Gressel, J.(1994).Are herbicide mixtures useful for delaying the rapid
evolution of resistance? Acase study. Weed Technology ,8, 635-48.
Wyse, D.L.(1992).Future of weed science research. Weed Technology ,6, 162-5.
Zoschke,A.(1994).Toward reduced herbicide rates and adapted weed management. Weed
Technology ,8, 376-86.