Articles
EFFECTS OF TOMATO RINGSPOT VIRUS AND PRUNUS NECROTIC RINGSPOT VIRUS ALONE AND IN COMBINATION ON THE GROWTH AND YIELD OF ‘MONTMORENCY’ SOUR CHERRY
Article number
309_13
Pages
111 – 114
Language
Abstract
In Spring 1985, 2-year-old ‘Montmorency’ sour cherry trees on ‘Mahaleb’ rootstocks were inoculated at a point 2 cm below the graft union with a 0.5 cm diameter plug of bark containing tomato ringspot virus (TmRSV) or prunus necrotic ringspot virus (PNRSV) singly or together.
To insure successful inoculation with TmRSV, an additional inoculation was made in the summer using purified virus (0.25 mg/ml) and slash inoculating the bark below the graft union with a razor blade.
All trees were planted in soil that had been pre- plant fumigated with a high rate of methyl bromide-chloropicrin using a shank injector and polyethylene tarping.
During 1987, 1988 and 1989, all inoculated and mock inoculated controls were tested by ELISA to detect single and double infection by the two viruses.
In autumn 1989, growth measurements were made for trunk circumference, tree height and shoot growth among trees in the treatment groups.
In summer, 1990, yield measurements were made.
TmRSV-infected trees yielded 385 gm and healthy trees, 828.5 gm fruit per tree (F=4.14; P=0.05). No significant differences in growth were found.
Yield differences between PNRSV-infected and healthy trees were not significant (F=0.05; P=>0.5). PNRSV-infected trees yielded 744.9 gm and healthy, 828.5 gm per tree.
Growth was not significantly affected by PNRSV. Doubly infected trees yielded 317.3 gm vs. healthy trees, which yielded 828.5 gm per tree.
This was a significant reduction (F=1.87; P=0.18). Doubly infected trees had a reduction in height of 8.3%, compared to healthy trees (F=2.47; P=0.13). Trunk circumference was reduced 12.1% (F=2.57; P=0.12). Shoot growth was not significantly affected.
To insure successful inoculation with TmRSV, an additional inoculation was made in the summer using purified virus (0.25 mg/ml) and slash inoculating the bark below the graft union with a razor blade.
All trees were planted in soil that had been pre- plant fumigated with a high rate of methyl bromide-chloropicrin using a shank injector and polyethylene tarping.
During 1987, 1988 and 1989, all inoculated and mock inoculated controls were tested by ELISA to detect single and double infection by the two viruses.
In autumn 1989, growth measurements were made for trunk circumference, tree height and shoot growth among trees in the treatment groups.
In summer, 1990, yield measurements were made.
TmRSV-infected trees yielded 385 gm and healthy trees, 828.5 gm fruit per tree (F=4.14; P=0.05). No significant differences in growth were found.
Yield differences between PNRSV-infected and healthy trees were not significant (F=0.05; P=>0.5). PNRSV-infected trees yielded 744.9 gm and healthy, 828.5 gm per tree.
Growth was not significantly affected by PNRSV. Doubly infected trees yielded 317.3 gm vs. healthy trees, which yielded 828.5 gm per tree.
This was a significant reduction (F=1.87; P=0.18). Doubly infected trees had a reduction in height of 8.3%, compared to healthy trees (F=2.47; P=0.13). Trunk circumference was reduced 12.1% (F=2.57; P=0.12). Shoot growth was not significantly affected.
Authors
D.C. Ramsdell, G.W. Bird, V.A. Adler, J.M. Gillett
Keywords
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