| Material Information
||Diseases of leatherleaf fern and their control
||ARC-Apopka research report
||2 p. : ; 28 cm.
||Chase, A. R ( Ann Renee )
Agricultural Research Center (Apopka, Fla.)
||University of Florida, IFAS, Agricultural Research Center-Apopka
||Place of Publication:
||Leatherleaf fern -- Diseases and pests -- Control -- Florida ( lcsh )
||government publication (state, provincial, terriorial, dependent) ( marcgt )
bibliography ( marcgt )
non-fiction ( marcgt )
||Includes bibliographical references (p. 1).
||Statement of Responsibility:
||ARC-A research report ;
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Copyright 2005, Board of Trustees, University
DISEASES OF LEATHERLEAF FERN AND THEIR CONTROL ----- ---
A. R. Chase
IFAS, University of Florida JUL 17 1934
Agricultural Research Center Apopka
ARC-Apopka Research Report RH-84-8 i f,
A '.- Univ. of Florida
Leatherleaf fern (Rumohra adiantiformis) is grown for the cut foliage
market in Europe and the United States and Canada. The majority of the
fern production is located in Central Florida. Warm, moist weather promotes
production of the fern, but also favors development of several diseases of
leatherleaf fern. Despite the favorable environment, relatively few diseases
are common or economically important on this crop. The following table
gives brief descriptions of each disease as well as important factors in
disease control, such as the most favorable time of year for disease dev-
elopment and other hosts of the pathogens. Further detailed information on
each disease can be found by consulting the references (listed by number
and in parentheses). Several other diseases have been included in past
articles but will not be covered here since they have not been documented
sufficiently or do not occur commonly.
1. Chase, A. R. 1982. Rhizoctonia aerial blight's effects on leatherleaf
ferns and pittosporums. American Nurseryman 156(4):75-76.
2. Chase, A. R. 1983. Leatherleaf fern root rot disease is common when soil
moisture is high. Southern Florist and Nurseryman 96(27):38, 41.
3. Henley, R. W., D. E. Short, R. A. Dunn, and G. W. Simone. 1980. 1980
Leatherleaf fern pest control recommendations. Ornamental Horticulture
Fact Sheet, OH-43, 4p.
4. Knauss, J. F. 1970. Ascochyta leaf spot, a new disease of leatherleaf
fern, Polystichum adiantiformis. Proc. Amer. Soc. Hort. Sci., Trop. Reg.
5. Marousky, F. J. and P. P. Q. deWildt. 1982.- Post harvest decay of
Florida leatherleaf fern. Plant Disease 66:1029-1031.
6. Sobers, E. K. 1968. Morphology and host range of Cylindrocladium
pteridis. Phytopathology 68:1265-1270.
Ascochyta leaf spot
Red-brown spots up to 1/8 inch long, pin- Disease occurs primarily in the
point to elliptical. Leaf tips may be dark- spring. Benlate, Daconil and Manza
brown and new fronds are sometimes distorted. are labeled for fern and should co
Bracken fern are also hosts of this fungus. trol this disease. Use Benlate at
This disease is not common. (Ref. 4) 1/2 lb or Daconil or Manzate at 1 a
1/2 Ibs per 100 gallons as a foliar
Cylindrocladium leaf spot
Spots are pinpoint to 1/2 inch long and Benlate, Daconil and Manzate are
are reddish to grayish brown. They can be labeled on this fern and can aid in
water-soaked and coalesce to encompass much control of this disease. Use them
of the frond. Disease is most severe in the the rates listed above. Irrigation
summer but can occur during warm winters, early in the day allows rapid dryin
(Ref. 6) of the foliage and can reduce disea
Cylindrocladium post-harvest decay
Lesions (leaf spots) are generally gray Maintenance at 400F can eliminate
and water-soaked and entire fronds are development of the disease during s
frequently affected. (Ref. 5) ment. Benlate at 1/4 lb per 100 ga
Ions as a dip effectively controlled
decay in our trials. Cooling the f
as rapidly as possible following ha
vest may aid in reducing disease.
Pythium root rot
Plants are grayish-green or chlorotic in Banrot at 3/4 lb per 100 gallons
color and may wilt. Roots are brown, mushy labeled for root rots of this plan
and reduced (stunted). Disease is most sev- Research has shown that Subdue (4 o
ere in ferneries with poor drainage fol- 100 gal), Truban (8 oz/100 gal) or
lowing excessive winter rains or applica- Aliette (24 oz/100 gal) provide goo
tions of water for freeze protection. control of Pythium root rot.
Rhizoctonia aerial blight
Spots occur all over the plants and are Benlate, Daconil, and Manzate are
dark-brown to grayish, sometimes covering labeled for this plant and provide
entire fronds. The weblike mycleium of good disease control. Use at rates
the pathogen frequently spreads up the stipes listed for Ascochyta 1eaf spot. Ke
onto the fronds especially in the center of fern cut to allow good air circulate
the plants where the mositure levels are and reduce disease development in b
high. Disease is most common in the summer. centers. Pittosporum are also host
(Ref. 1) of the pathogen and disease spreads
easily from one crop to the other.
Rhizoctonia post-harvest decay
Similar in most ways to Cylindrocladium Same as for Cylindrocladium post-
post-harvest decay except the weblike my- harvest decay.
celium of Rhizoctonia may cover bunches
affected with this disease. (Ref. 5)