The gooseberry. An ancient crop known to the classical Greeks and Romans. A powdery mildew (Sphaerotheca mors-uvae) native to North America has prevented cultivation on that continent, and its introduction to Europe in 1905 caused severe damage. There is scope for breeding for horizontal resistance by amateurs. Ribes spp.
The garden currants. There are a number of cultivated species of black and red currants, and white currants are a variety of Ribes sativum, the main red currant. Ribes spp., are the alternate host of white pine blister rust, which largely prevents their cultivation in North America. There is much scope for amateur breeders willing to work with horizontal resistance to a number of pests and diseases in these crops of somewhat limited commercial importance.
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