Host plant resistance (HPR) to large raspberry aphid (LPA)
The large raspberry aphid (LRA), Amphorophora idaei, is a major raspberry pest. Several resistance loci to LRA have previously been identified, including the widely commercialised A1 and A10 resistance genes which remain present in a subset of commercially available raspberry varieties. This project seeks to re-establish HPR to LRA in raspberry by evaluating known and potential new sources of resistance, identifying associated molecular markers, with a view to pyramiding multiple resistance genes within individual varieties to provide durable resistance.
Culture collection
Large raspberry aphid cultures at ADAS Boxworth. Aphids are maintained under controlled environment conditions to permit year-round culturing of asexual life-stage (viviparous adult females).
Testing resistance
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Through manual infestation studies, each LRA population has been tested to evaluate its sensitivity to the commercially available resistance genes A1 and A10.
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Of the 12 LRA populations tested to date, two populations were found to be susceptible to both A1 and A10 resistance, five populations were A1-breaking only, while five populations were insensitive to both A1 and A10.
