Abstract
Washington navel orange trees on trifoliate orange rootstocks were inoculated at various ages with budwood from either severely dwarfed Washington navel trees with butt scaling caused by exocortis virus or moderately dwarfed Marsh grapefruit trees with no butt scaling. Dwarfing, measured by trunk girth, became apparent four seasons after inoculation, the butt scaling inoculum causing more pronounced dwarfing than the non-scaling inoculum. For both inocula, trees inoculated in the nursery were the most dwarfed, and yielded least, with trees inoculated in the field one, two, three or five years later being successively less dwarfed and high yielding. In a second experiment, Washington navel orange trees on trifoliate orange, which were carrying exocortis virus or were inoculated with it either in the nursery or later in the field, were planted in 1962 at a density of 835 ha-1. The field inoculated trees subsequently grew larger than the others. All were more dwarfed but yielded more heavily on a ground area basis during five years of cropping than exocortis-free trees planted at a normal density of 222 ha-1. Dwarfed trees developed butt scaling symptoms and periodically became unthrifty. The non-scaling form of dwarfing lends itself to the development of high density plantings of small trees with consequent benefits in management and high early production
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Claims 9
Claim · model-written summary
Inoculated trees showed dwarfing by trunk girth four seasons after inoculation.
- Taxon
- Washington navel orange treest0
- Treatment
- inoculatione0
- Outcome
- trunk girthe0
- Direction
- Dwarfinge0
- Qualifier
- four seasons after inoculatione0
Not reportedComparator
Verbatim
e0“Dwarfing, measured by trunk girth, became apparent four seasons after inoculation, the butt scaling inoculum causing more pronounced dwarfing than the non-scaling inoculum.”
t0“Washington navel orange trees”
Claim · model-written summary
Butt scaling inoculum caused more dwarfing than non-scaling inoculum.
Verbatim
e0“the butt scaling inoculum causing more pronounced dwarfing than the non-scaling inoculum.”
t0“Washington navel orange trees”
Claim · model-written summary
For both inocula, nursery inoculation produced the greatest dwarfing compared with later field inoculation.
Verbatim
e0“For both inocula, trees inoculated in the nursery were the most dwarfed, and yielded least, with trees inoculated in the field one, two, three or five years later being successively less dwarfed and high yielding.”
t0“Washington navel orange trees”
Claim · model-written summary
For both inocula, nursery inoculation yielded least compared with later field inoculation.
Verbatim
e0“For both inocula, trees inoculated in the nursery were the most dwarfed, and yielded least, with trees inoculated in the field one, two, three or five years later being successively less dwarfed and high yielding.”
t0“Washington navel orange trees”
Claim · model-written summary
Field inoculated trees grew larger than trees infected or inoculated earlier.
Verbatim
e0“The field inoculated trees subsequently grew larger than the others.”
t0“Washington navel orange trees”
Claim · model-written summary
Dense exocortis affected plantings had more dwarfing than normal density exocortis free plantings.
Verbatim
e0“All were more dwarfed but yielded more heavily on a ground area basis during five years of cropping than exocortis-free trees planted at a normal density of 222 ha-1.”
t0“Washington navel orange trees”
Claim · model-written summary
Dense exocortis affected plantings yielded more per ground area than normal density exocortis free plantings.
Verbatim
e0“All were more dwarfed but yielded more heavily on a ground area basis during five years of cropping than exocortis-free trees planted at a normal density of 222 ha-1.”
t0“Washington navel orange trees”
Claim · model-written summary
Dwarfed trees developed butt scaling and periodically became unthrifty.
Verbatim
e0“Dwarfed trees developed butt scaling symptoms and periodically became unthrifty.”
t0“Washington navel orange trees”
Claim · model-written summary
The authors consider non-scaling dwarfing suitable for dense plantings with management and early production benefits.
Verbatim
e0“The non-scaling form of dwarfing lends itself to the development of high density plantings of small trees with consequent benefits in management and high early production”
t0“Washington navel orange trees”
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