- Hardy, Yvan J.
Université Laval Québec
A spruce budworm hazard rating map is elaborated by superposition of the cartography of annual damages caused by the spruce budworm, Choristoneura fumiferana (Clem.), over a period of 5 years. The various levels of risk are based on the physiological value of each year of foliage production and the ability of balsam fir, Abies balsamea Mill., to resist repeated budworm attacks. Applied to the forest of Quebec, the hazard map allows for a more rational utilization of pesticides against the budworm.