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The amount and role of Hendersonia acico/a Tub. in the epidemic caused by Lophoderme//a su/cigena (Rostr.) v. Hohn. was followed on Scots pine (Pinus sylvestris L.) in Fin land . From year to year H acico/a increased on need les primarily infected by L. su/cigena up to the end of the Lophoderme//a epidemic. Hendersonia was fir st abundant in the lower crown, while the upper parts were nearly free of it. The increase of H acicola prevented L. su/cigena from producing ascocarps and led to the recove ry of the trees and stands. L sulcigena could fruit only in those needles which were free of H acicola in the autumn. The autumnal presence of H acicola in the needles led to a natural control of the pathogen. Experiments with H acico/a showed that it is possible to develop biological control against L su/cigena.

Hendersonia acicola in an epidemic caused by Lophodermella sulcigena with special reference to biological control