ISHS Acta Horticulturae 713: VI International Peach Symposium
FIELD EVALUATION OF ´GUARDIAN´™ PEACH ROOTSTOCK TO DIFFERENT ROOT-KNOT NEMATODE SPECIES |
| Authors: | A.P. Nyczepir, T.G. Beckman, G.L. Reighard |
| Keywords: | Meloidogyne incognita, M. floridensis, M. javanica, pathogenicity, peach, Prunus persica, resistance |
| Abstract:
Advanced lines of ‘Guardian’™ (i.e., SL2891 and SC 3-17-7) and ‘Lovell’ peach rootstocks were evaluated for their susceptibility and growth response to Meloidogyne incognita (GA-peach isolate) and M. javanica (NC-tobacco isolate) 23 months after inoculation in field microplots. Results indicate that there was a significant interaction between nematode and rootstock for above-ground tree growth. Growth suppression, as measured by trunk diameter and fresh shoot weight of SC 3-17-7 was greater (P<0.05) in the presence of M. javanica as compared to the presence of M. incognita or to the uninoculated plots. ‘Guardian’™ line SL2891 growth was not affected by either nematode when compared to the uninoculated plots. Tree growth of ‘Lovell’ was suppressed by both M. incognita and M. javanica when compared to the uninoculated plots. Below-ground growth suppression, as measured by dry root weight, was greater in ‘Lovell’ than in either SC 3-17-7 or SL2891 regardless of nematode species. No difference in dry root weight was detected between the two ‘Guardian’™ lines. Root galling occurred on all rootstocks tested with either M. incognita or M. javanica. Root galling was more abundant on ‘Lovell’, intermediate on SL2891 and least abundant on SC 3-17-7. Similar results were also detected for number of eggs per gram dry root weight regardless of nematode species. In another microplot study, M. floridensis and M. incognita did not suppress tree growth of SC 3-17-7, ‘Nemaguard’, or ‘Flordaguard’ rootstocks as compared to the uninoculated control. Meloidogyne floridensis reproduced on all 3 rootstocks, with greatest number of eggs per gram dry root being produced on ‘Guardian’TM and ‘Nemaguard’. | |
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