Effect of temperature on thein vitroreproductive fitness ofPratylenchus coffeaepopulations from Vietnam

The in vitro reproductive fitness on carrot discs of 10 Pratylenchus coffeae populations collected from different agricultural crops in different agro-ecological regions in Vietnam was studied and compared with the reproductive fitness of a P. coffeae population from Ghana. Few major differences in in vitro reproductive fitness on carrot discs among the 10 P. coffeae populations from Vietnam examined (with the exception of one population originally isolated from the roots of an unidentified ornamental tree and one population originally isolated from banana), and between these populations and the P. coffeae population originally isolated from banana in Ghana were observed. Our observations indicate that although the optimum temperature for reproduction of three P. coffeae populations from Vietnam examined is 25 °C to, at least, 30 °C, these populations are also tolerant to low temperatures (15–20 °C) enabling them to survive the low temperatures which occur during the winter in the northern and central parts of Vietnam.