Abstract
In vitro germination of basidiospores of 10 isolates of Cronartium quercuum f. sp. fusiforme occurred within 24 h at temperatures of 8-32 C. At 32 C, only very short germ tubes developed. Germination was frequent at temperatures of 12-28 C, and 90% of the maximum germination occurred at 14.6-29.6 C. On the basis of second-degree polynomial regressions, the optimum temperatures during 24 h of moist incubation for the infection of pines were 17.7 and 19 C in two experiments. Moist incubation for 24 h at 11.6-23.4 C resulted in >90% of the maximum infection rate for susceptible slash pine seedlings. Basidiospores were able to initiate infections over a broad temperature range of 8-28 C during a 24-h period of moist incubation [...]
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