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            <title xml:lang="fr">Détermination des populations du Bombyx disparate en forêt</title>
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                <title xml:lang="fr">Détermination des populations du Bombyx disparate en forêt</title>
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              <p>Dans un massif forestier d'Eure-et-Loir, on a comparé deux méthodes d'estimation du nombre de pontes de bombyx disparate. La méthode classique très consommatrice de temps (2,5 heures par parcelle) a été corrélée dans 14 parcelles forestières à la méthode des " 5 minutes " où on compte toutes les pontes vues lors d'un parcours rectiligne de 5 minutes. Il apparaît qu'en effectuant un parcours de ce type pour 5 ha, on obtient un chiffre fiable d'estimation du risque. Cette méthode réduit donc le ttravail par 5. / In a state forest of Eure-et-Loir, two methods for estimating gypsy-moth egg-mass densities were compared. A relationship model between the " classic method " (time expensive : 2,5 hours for 25 ha) and the " five minutes " one (all the egg-masses seen are counted during a straight walking of 5 minutes) was etablished from data of 14 woodplots. With only a walking for 5 ha, a reliable defoliation risk estimation is obtained. This method shares out the spent time by 5.</p>
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