Biology and control of Sirococcus shoot blight on red pine,

Host‐related variation among isolates of the Sirococcus shoot blight pathogen from conifers

“…Influence of substrate and maturity on conidial size and shape is common among fungi, and conidia of S. conigenus (or its many synonyms) described in the literature have varied enough to encompass both of these groups. Seed transmission has been documented for spruces (Sutherland et al 1981), and chemical control trials have focused on pine seedlings (Smith et al 1972;Ostry et al 1990) and spruce seed (Motta et al 1996). Large deviations in conidial size from these ranges, however, are probably suggestive of differences that will be supported by evaluation of other markers.…”

“…(Maresi and Capretti 1995;Danti and Capretti 1998). also is susceptible (Magasi 1975;Ostry et al 1990). Carrière), white fir (Abies concolor (Gordon & Glend.)…”

“…The pathogen is often found on cones, can be seed-borne, and is particularly damaging to container grown spruces in coastal British Columbia nurseries (Sutherland et al 1981). Sapling-sized red pines were killed after successive years of Sirococcus shoot blight in a Wisconsin plantation (Ostry et al 1990). Bare-root seedlings can also be affected, with losses due to Sirococcus shoot blight in 2-year-old black spruce seedlings in eastern Canada estimated at 24% ).…”

“…In both eastern Canada and the Great Lakes region of the United States, Sirococcus shoot blight has been studied on red pine (P. resinosa Aiton), and jack pine (P. banksiana Lamb.) also is susceptible (Magasi 1975;Ostry et al 1990). Reports from Idaho and the coastal western United States and Canada include occurrence of S. conigenus on Engelmann (P. engelmannii Parry ex Engelm.…”

“…In the western United States, S. conigenus can cause discrete, purplish lesions and stem cankers on current year's growth of pine seedlings (Smith 1973). Sapling-sized red pines were killed after successive years of Sirococcus shoot blight in a Wisconsin plantation (Ostry et al 1990). Halmschlager et al (2000) studied the impact of Sirococcus shoot blight in a Norway spruce plantation approximately 20 years old in which terminal shoots and more than 60% of current lateral shoots of some trees were affected.…”