ISHS Acta Horticulturae 186: IV International Symposium on Small Fruit Virus Diseases
AN IMPROVED INDEXING PROCEDURE FOR SOME STRAWBERRY VIRUSES IN A HOT CLIMATE AREA |
| Author: | S. Spiegel |
| Abstract:
Two aphid-borne viruses, strawberry mild yellow-edge (MYEV) and strawberry mottle (SMV), and one seed-borne virus, tobacco streak (TSV), have been detected in strawberry in Israel since 1980. Indexing was done by leaf grafting to standard Fragaria indicators grown in a greenhouse below 25°C. However, maintaining these indicators in a vigorous state and free of the "heat spot" symptom met with difficulties during the long summer season mainly with the clone UC-6 but occasionally also with 'Alpine'. Therefore Duchesnea indica was evaluated as an indicator for the three strawberry viruses. D. indica plants readily produced obvious symptoms following leaf graft inoculation with SMV, and were superior to the Fragaria indicator clones UC-5 and 'Alpine'. D. indica was a symptomless host for MYEV and TSV. This phenomenon allows detection of SMV in plants infected with both MYEV and SMV during all seasons, without the use of UC-6. D. indica plants were easily maintained throughout the year in good physiological condition and were not adversely affected by high intensity light. This indicator is presently included in Israel in the indexing procedure for strawberry viruses. | |
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