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A substantial proportion (15-56%) of Rhopalosiphum species caught in suction traps, on sticky thread traps and in suction ground samples, above or in cereal crops at Hilton, South Canterbury in autumn of 1997 and 1998 were apple grass aphids (Rhopalosiphum insertum). The remaining Rhopalosiphum specimens were R. padi. At two other sites in Canterbury (Lincoln: 1996, 1997 and 1998, and Rokeby: 1998), and at Hilton in 1996, R. padi was the most common Rhopalosiphum species caught (>96%). Few other cereal inhabiting species were found. The apple grass aphid was previously thought to be uncommon in Canterbury but our results indicate that it may be a potentially important vector of BYDV in cereal crops in some situations and should be taken into account in aphid monitoring virus forecasting programmes.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Apple grass aphid (<i>Rhopalosiphum insertum</i>) on cereals in Canterbury