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Injuriousness of the colza stem weevil

Injuriousness of the colza stem weevil

Phytoma (384): 35-37

The results are presented of applying various methods for assessing the relation between the incidence of Ceutorhynchus napi and losses of yield of colza in 2 areas of France. In the Bourges area, a threshold of one oviposition puncture per plant (a level rarely reached) before control measures were needed was established.

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Accession: 001619988

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