Scirrhia Pini N. Sp., the Perfect State of Dothistroma Pini Hulbary

Abstract

The perfect state of Dothistroma pini Hulbary was found on native and exotic pines in British Columbia. It is described as a new species of Scirrhia Fuckel, and the name S. pini is proposed. The life history, cultural characteristics, and distribution are presented.

The role of weather and topography in the development of Dothistroma septosporum.

“…The majority of green translucent bands forming in the fall turn bright red and develop mature fruiting bodies the following spring (Funk and Parker 1966). During the establishment of study plots in May, low to moderate red banding was observed on selected sites as well as low fruiting body numbers.…”

“…Sample size Time as measured in Julian days (Funk and Parker 1966;. The majority of green translucent bands forming in the fall turn bright red and develop mature fruiting bodies the following spring (Funk and Parker 1966).…”

“…However this requirement may have resulted in ascomata numbers being under-estimated because the presence of immature ascomata was not recorded and due to the similar appearance of both reproductive stages, immature sexual fruiting bodies were counted as asexual. It is possible that sampling once a week was not sensitive enough to capture the period in which sexual reproduction occurs, though this would be unlikely if ascospore production lasts about a month (Funk and Parker 1966). In southern BC Funk and Parker (1966) reported that conidia are produced from early spring to late summer or early fall, while ascospores are produced in early June.…”

“…It is possible that sampling once a week was not sensitive enough to capture the period in which sexual reproduction occurs, though this would be unlikely if ascospore production lasts about a month (Funk and Parker 1966). In southern BC Funk and Parker (1966) reported that conidia are produced from early spring to late summer or early fall, while ascospores are produced in early June. In northwestern BC if sexual reproduction had occurred primarily in late spring, overlapping only briefly with conidia production, it may have been missed.…”

Genetic structure of the foliar pathogen Dothistroma septosporum in northwest British Columbia suggests recombination and high gene flow.

“…Dothistroma septosporum was first noted in the 1960s on both native and exotic Pinus species in British Columbia (Funk & Parker 1966, Parker & Collis 1966 however recent work using tree ring records has shown an outbreak history of the pathogen from as far back as the early 1800s (Welsh 2007). The teleomorph was identified on foliage from several British Columbia localities in 1964and 1965(Funk and Parker 1966.…”