Comparaison de deux methodes ?estimation de ľinfection dejeunespeupliersparleMarssoninabrunnea(Ell. et Ev.) P. Magn.

Comparison of two methods for evaluating infection of young poplar leaves by Marssonina brunnea . Two methods for evaluating foliar infection by Marssonina brunnea have been compared on 783 twigs. They appear to be correlated. Distribution in infection classes can be coded and this allows a prediction of the number of spots per square centimeter. Application of the code to two other experiments is discussed.