Morphology and morphometrics of Pratylenchus brachyurus and P. zeae III. influence of geographical location

Linear and relative dimensons in population of Pratylenchus hrachyurus (Godfrey, 1929) Filipjev & Schuurman, 1941 and P. zeae Graham, 1951 from sex different geographical areas varied widely, but stylet length and “Y” ratio were found to be good diagnostic characters. Populations of the two srecies from Australia had larger body size than populations from North Carolina. Rhodesia, Singapore, Malawi and Nigeria. A new. relative dimension (P.O.), derived from posterior oesophagus length as a percentage of total oesophageal length, is a potentially useful taxonomic character. Few males and inseminated females were found in population of P. zeae from Singapore.