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Comparison of Mite Resistance for Control of Wheat Streak Mosaic

Crop Sciences Section, Agric. Canada Res. Stn., P.O. Box 3000, Main, Lethbridge, AB, T1J 4B1

^* Corresponding author.

The wheat curl mite (Eriophyes [Aceria] tulipae Keifer) is the vector of wheat streak mosaic virus (WSMV), which incites wheat streak mosaic (WSM), a disease that causes serious yield losses winter wheat (Triticum aestivum L. em. Thell.). Several sources of resistance to mite colonization have been identified. Our objective was to determine the relative effectiveness of four sources of mite resistance in controlling the spread of WSMV. A series of controlled environmental tests showed that the incidence of WSMV tended to be lowest in ‘Rescue’-Agropyron elongatum (Host) P. Beauv. chromosome substitution, addition, or translocation lines involving Chromosome 6 from A. elongatum. Disease incidence was significantly lower in the wheat-rye (Secale cereale L.) translocation line KS80H4200 and in the ‘Norstar’-Aegilops squarrosa L. backcross line NST*4/CMC1 than in the mite-susceptible wheat cultivars Norstar and Rescue. The incidence of WSM was usually higher in the cultivar TAM 107, which carries a wheat-rye translocation, than in other mite-resistant entries and was not always significantly different from the mite-susceptible winter wheat Norstar, even though TAM 107 reduced the incidence of symptoms of mite feeding. All entries tested were highly susceptible to WSMV when mechanically inoculated. In the field, following a light natural infestation of the wheat curl mite, lines from the cross NST*4/CMCI contained 40% fewer WSMV-infected plants than lines without mite resistance. This study demonstrated that the mite resistance derived from A. elongatum was more effective in limiting the spread of WSM than was mite resistance originating from either rye or Ae. squarrosa.

Received for publication March 23, 1990.

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