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Injuriousness of the colza stem weevil


Phytoma (384): 35-37
Injuriousness of the colza stem weevil
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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