BACKGROUND We performed an ethnomycological study in a community in Tlaxcala, Central Mexico to identify the most important species of wild mushrooms growing in an oak forest, their significance criteria, and to validate the Cultural Significance Index (CSI). METHODS Thirty-three mestizo individuals were randomly selected in San Mateo Huexoyucan and were asked seven questions based on criteri...

Seasonal fluctuations in field populations of Meloidogyne incognita, Pratylenchus zeae, P. brachyurus, Criconemoides ornatus, Trichodorus christiei, and Helicotylenchus dihystera on monocultured corn, cotton, peanut, and soybean were determined monthly for 4 yr. Population densities of M. incognita were greater in corn and cotton plots than in peanut and soybean plots from July until January. T...

234 A mutant form of the succinate dehydrogenase iron-sulphur protein subunit confers resistance to carboxin in the maize smut pathogen Ustilago maydis John P. R. Keon, P. L. Elaine Broomfield, Gordon A. White* and John A. Hargreaves Department of Agricultural Sciences, University of Bristol, A.F.R.C. Institute of Arable Crops Research, Long Ashton Research Station, Bristol BSI 8 9AF, U.K. and ...