Rm. Connan et Dr. Wise, FURTHER-STUDIES ON THE DEVELOPMENT AND SURVIVAL AT LOW-TEMPERATURES OF THE FREE-LIVING STAGES OF TRICHOSTRONGYLUS-TENUIS, Research in Veterinary Science, 57(2), 1994, pp. 215-219
To assess the ability of the free living stages of Trichostrongylus te
nuis, a pathogen of red grouse, to survive the winter in significant n
umbers, the temperatures prevailing during the autumn, winter and spri
ng of 1991-92 on the North Yorkshire moors were simulated in an incuba
tor into which replicate cultures of T tenuis eggs were placed at inte
rvals. September and early October eggs developed into larvae which su
rvived over winter and were infective the following spring. few Novemb
er to February eggs survived to become larvae but early March eggs wer
e reasonably successful. Continuous temperatures of -15 degrees C were
lethal to infective larvae within 12 days, but significant numbers of
larvae survived temperatures of -10 degrees C or higher for up to thr
ee weeks and remained infective.