Rhagoletis Host Shift When apples were introduced to North America, the larva of Rhagoletis pomonella started feeding on them.
{"Image DocumentName": "Rhagoletis Speciation", "Image ImageDescription": "Hawthorn. Apple. Small fruit (13 mm) Large fruit (70 mm) High nutritional quality Low nutritional quality. Shallow burrows Deep burrows. More parasitoid wasps Fewer wasps. Fruit available later Fruit available early. Image Credits. Description: Hawthorn fruit. Source: UBC Botanical Garden and Centre for Plant Research,  Licensing: Licensed under the Creative Commons Attribution-Noncommercial 2.0 Canada License. Description: Red Delicious apple. Source: Wikimedia Commons,  Licensing: Licensed under the Creative Commons Attribution ShareAlike 3.0 License.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}