ISHS Acta Horticulturae 386: XVI International Symposium on Fruit Tree Virus diseases
EFECT OF APPLE MOSAIC VIRUS (APMV) ON THE GROWTH AND YIELD OF "NEGRET" HAZELNUT |
| Authors: | J.M. Aramburu, M. Rovira |
| Abstract:
One year old "Negret" hazelnut trees clonally propagated and free of apple mosaic virus (ApMV) as shown by ELISA were planted in a disinfested plot to determine the effect of ApMV on growth and yield. "Segorbe" hazelnut trees free of ApMV were planted as pollinators (1:8). Trees placed at the borders were not considered in the trial. Single trees replicates in a completely randomized were considered in the design with 40 "Negret" trees per treatment, healthy and infected. ApMV infection was made one year after planting by grafting 2 pieces of bark from ApMV infected hazelnuts to each tree and trees were tested the following spring by ELISA to assay for the presence of virus. Four years after planting trunk circumference, shoot growth, sucker number and yield records were taken. All hazelnut trees inoculated showed leaf mosaic symptoms in Spring and were ApMV positive by ELISA. The first results showed no significant differences in shoot growth but vigour was significantly affected by ApMV (P<0.02). However, the presence of a variable sucker number, with independence of treatment, could produce erroneous conclusion in tree growth comparisons due to elimination of suckers every year. Healthy and infected trees yielded on average 375.4 g and 158.3 g of nuts per tree respectively, which is a significant difference (P<0.01). | |
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