| Material Information
||Factors affecting growth of Fatsia
||AREC-Apopka research report
||2 p. : ; 28 cm.
||Chase, A. R ( Ann Renee )
Poole, R. T ( Richard Turk )
Agricultural Research and Education Center (Apopka, Fla.)
||University of Florida, IFAS, Agricultural Research and Education Center-Apopka
||Place of Publication:
||Growth (Plants) -- Florida ( lcsh )
Alternaria diseases -- Control -- Florida ( lcsh )
Plants -- Effect of light on -- Florida ( lcsh )
||government publication (state, provincial, terriorial, dependent) ( marcgt )
non-fiction ( marcgt )
||Statement of Responsibility:
||A.R. Chase and R.T. Poole.
| Record Information
||University of Florida
||All rights reserved by the source institution and holding location.
||oclc - 70667341
The publications in this collection do
not reflect current scientific knowledge
or recommendations. These texts
represent the historic publishing
record of the Institute for Food and
Agricultural Sciences and should be
used only to trace the historic work of
the Institute and its staff. Current IFAS
research may be found on the
Electronic Data Information Source
site maintained by the Florida
Cooperative Extension Service.
Copyright 2005, Board of Trustees, University
9i6s, Le l_-
Factors Affecting Growth of Fatsia Central Science
A. R. Chase and R. T. Poole1
University of Florida, IFAS' 1987
Agricultural Research and Education Center Aptk
AREC-Apopka Research Report RH- 6-10, 1
I University of Florida
Limited information is available concerning fatz M ts-a e g-rr
and disease susceptibility of Fatsia .iaponica (Japanese aralia). A test
was performed to evaluate the effect of light level during production on
Fatsia growth and susceptibility to Alternaria panax (cause of Alternaria
leaf spot) in the spring of 1984. A second test was performed in the fall
of 1985 to evaluate different rates of Osmocote 19:6:12 on growth of
Three plants each of Fatsia were potted into 4" pots and placed under
1000 (73% shade) or 3000 (47% shade) ft-c natural light in a shadehouse.
Ten pots were used for each light level. Plants were potted in a
steam-treated potting medium consisting of Canadian peat, pine bark and
cypress shavings (2:1:1, V:V:V) which was amended with 1 lb Micromax, 7 Ibs
dolomite, and 10 Ibs Osmocote 19:6:12 per cubic yard. Plants were
irrigated twice weekly using overhead sprinklers. The test was initiated
on December 2, 1984, and plants were inoculated with spores of Alternaria
panax March 16, 1985. Just prior to inoculation plant height and leaf
number were recorded. Number of lesions per plant was recorded March 27,
1985. Number of leaves was unaffected by shade level, although plants
produced under 1000 ft-c were an average of one inch shorter than those
produced under 3000 ft-c. Average number of lesions caused by Alternaria
panax was significantly higher on plants under the higher light level, with
an average of 15 lesions per plant under 3000 ft-c and 8 lesions per plant
under 1000 ft-c.
Growing Fatsia under 1000 ft-c light significantly decreased
susceptibility of the plant to Alternaria leaf spot. Previous work on this
disease with scheffleras showed a varying and unpredictable response when
tests were performed over a wider range of conditions. Evaluation of
optimal conditions for production of Fatsia by each grower is recommended
for control of Alternaria leaf spot.
Fatsia seedlings were potted in the same medium described above with
the exception that no Osmocote was added to the medium initially. Ten
plants were used for each of the following treatments: 3, 6, 9, 12, 15, or
18 g Osmocote 19:6:12 per 5" pot. Fertilizer was applied once on November
19, 1985 as a top-dressing. Plants were rated monthly for height, number
Associate Professor of Plant Pathology and Professor of Ornamental
Horticulture, respectively, Agricultural Research and Education Center,
2807 Binion Road, Apopka, FL 32703.
of leaves and soluble salts of the potting medium (leachate method). At
the end of 10 weeks they were also evaluated for top quality.
Plant height, number of leaves and quality were unaffected by
fertilizer treatment (Table 1). Soluble salts readings ranged from 840
jumhos/cm to 5600 pmhos/cm at the highest fertilizer level (Table 1).
Quality decreased as fertilizer level increased. Since no obvious benefit
was achieved by fertilizing plants at the high rates, using the lower rates
should save money while still providing good plant growth. In addition,
although roots were not evaluated, the high soluble salts present in the
potting media of the highest rates of fertilizer have been found to damage
roots of other plants.
Table 1. Effect of fertilizer level on growth of Fatsia japonica.
Osmocote 19:6:12 Height Number salts
per 5" pot (g)a inches leaves Qualityb umhos/cm
3 7.1nsc 14.5ns 4.2* 840**
6 7.2 13.1 4.4 1710
9. 7.2 13.7 4.1 3660
12 6.9 14.0 4.0 3660
15 6.9 13.4 3.9 5100
18 6.7 12.9 3.5 5600
aApplied once as a top-dressing on 11-19-85.
bAll ratings made on 1-31-86. Quality rated from 5 (excellent) to
1 (very poor).
CSignificance of the F test denoted as ns = not significant or significant
at the (5%) or ** (1%) level.