ISHS Acta Horticulturae 630: XXVI International Horticultural Congress: Nursery Crops; Development, Evaluation, Production and Use
RESISTANCE OF RHAPHIOLEPIS SELECTIONS TO ENTOMOSPORIUM LEAF SPOT |
| Author: | J.M. Ruter |
| Keywords: | Defoliation, disease, Erwinia, Indian hawthorn |
| Abstract:
Entomosporium leaf spot (Entomosporium mespili (DC.) Sacc.) on Indian hawthorn (Rhaphiolepis sp.) is recognized as a damaging disease in nurseries and landscapes. Thirteen selections Indian hawthorn were established in replicated plots in Tifton, Georgia (USDA 8a) on a Tifton loamy sand and evaluated for resistance to leaf spotting and defoliation in May of 1997, 1998, and 2001. Climatic conditions were not suitable for disease development in 1999 or 2000. Ratings by selection to the disease were: ‘Minor’, ‘Georgia Petite’, OliviaTM (excellent); ‘Georgia Charm’ (good); Eleanor TaberTM and ‘Pink Pearl’(moderate); and ‘Snow White’, ‘Clara’, Ballerina®, Bay Breeze®, Cameo®, ‘Elizabeth’, and ‘Kathy’ (unacceptable). Due to extensive disease development and defoliation unacceptable selections should not be recommended for nursery production or landscape use in the southeastern United States. Minor fire blight damage occurred only on the selection OliviaTM. | |
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