Black-stained nuts by walnut fruit fly and diseases: variety choice is relevant | Noircissement des noix dû aux mouches et aux maladies: importance du choix variétal
2012
Samietz, J. | Schwizer, Th. | Höhn, H. | Linder, Ch., Station de recherche Agroscope Changins-Waedenswil ACW, Waedenswil (Switzerland) | Aluja, M. | Guillén, L.
The American walnut husk fly (Rhagoletis completa), recently invasive to Switzerland, is not the only cause of black-stained walnuts - which can be hardly separated from their sticky, rotten husk. Both bacterial blight (Xanthomonas arboricola pv. juglandis) and Marssonina-fungi (Marssonina juglandis) can also lead to similar symptoms. Walnut varieties prove to be very differently affected by these plant diseases. The same kind of variability is now also confirmed for walnut husk fly by new results of Agroscope Changins- Wädenswil ACW together with Mexican specialists. These recent results lead to recommend robust varieties for replanting in order to allow pesticide-free and still effective walnut production in the North-alpine regions. To fulfill plant protection issues, but also to benefit of other good characteristics, following varieties are recommended: Sheinovo, Rainuss Kläusler, Fernette, Scharsch, Geisenheim 26, Meylannaise, Fernor, Ronde di Montignac, Wirz, Ferjean, Geisenheim 1247 and Parisienne. Among those, Meylannaise, Ronde di Montignac and Geisenheim 26 are very robust selfpollinating varieties.
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