Publications du Service canadien des forêts

Traitement réussi d'une plantation de pins rouges affectée par le Gremmeniella abietina, race européenne. 1999. Laflamme, G. Phytoprotection 80 : 55-64.

Année : 1999

Disponible au : Centre de foresterie des Laurentides

Numéro de catalogue : 16880

La langue : Français

Disponibilité : PDF (demande par courriel)



Scleroderris canker on pines is caused by the fungus Gremmeniella abietina. The European race of this ascomycete has been introduced in North America; it is more destructive than the native North American race as it can kill pole-size trees. There was no efficient control method of that disease in plantation. In 1982, systematic pruning of lower branches was used in red pine (Pinus resinosa) plantations located in Kazabazua, Québec. The four lower whorls of the 12-year-old pines were pruned in 1982. A year later, the incidence rate of the disease, initially at 67%, was reduced to 22%. Two other complementary interventions of pruning and cutting dead and dying trees in 1984 and 1985 reduced the disease to an endemic level. Annual observations were done from 1987 to 1995 to check for infections. The closure of the canopy in 1995 caused a natural pruning of many whoris and seems to have killed the remaining infected shoots. In the control plantation, the incidence of the disease varied from 86 to 100% during ail those years; in 1995, the rate of mortality has reached 47% of ail red pines. To avoid many successive interventions, it is recommended to prune the lower half of the crown whorls and even two thirds, if necessary, in infected plantations less than 20 years old.