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SSafe Use of Benodanil on Foliage Plants
A. R. Chase Central Science
University of Florida, IFAS Library
Agricultural Research and Education Center 1- Apopka
AREC-Apopka Research Report, RH-86-5 OCT 14 1987
Aerial blight of foliage plants is a serious disease ca4l~r of Florida
Rhizoctonia solani. Control of this disease has been successful over the
past few years when growers have applied preventive fungicides as drenches
of benomyl (Benlate 50WP) or foliar sprays of benomyl, chlorothalonil
(Daconil 2787 75 WP or 4.17 F), and iprodione (Chipco 26019 50WP).
Although these fungicides control Rhizoctonia aerial blight on many foliage
plants, none is specific for Rhizoctonia diseases. A new fungicide,
benodanil (MF-654), has a high degree of specificity for root and foliar
diseases caused by R. solani. Benodanil 50WP (2-Iodobenzanilide) is a
systemic fungicide specific for basidiomycetes such as R. solani and rusts.
An acute oral LD for rats of greater than 6,400 mg/kg would indicate a
high level of mamalian safety. Efficacy and safety of this compound had
been confirmed on Epipremnum aureum (pothos), Hedera helix (English ivy),
Nephrolepis exaltata (Boston fern), and Philodendron scandens oxycardium
(heart-leaf philodendron) in previous trials. Additional species of
foliage plants were tested for sensitivity to foliar or drench applications
A total of seven foliage plant species were tested for sensitivity to
benodanil. Some plants were treated with a soil drench (0, 4, or 8 oz
benodanil/100 gal) applied to each pot at 1 pint/ft surface area at
planting and again 6 weeks later. The remaining plants were treated with a
foliar application (0, 16, 24, or 32 oz benodanil/100 gal) applied five
times at 14 day intervals. Rates of'Benodanil were chosen to mirror
recommendations for effective control of Rhizoctonia diseases on
ornamentals. Plants were evaluated before treatment and at the end of
treatments for signs of phytotoxicity. These ratings included residue
(foliar only), height, and fresh weights of tops and roots (drench only).
Plants included in the foliar test were Cissus rhombifolia (grape ivy),
Philodendron hastatum, and Schefflera arboricola (dwarf schefflera).
Drench treatments were applied to Aglaonema commutatum ('Silver Queen'),
Fatsia japonica (Japanese aralia), Spathiphyllum sp. ('Mauna Loa'), and
Syngonium podophyllum ('White Butterfly').
1Associate Professor of Plant Pathology, Agricultural Research and
Education Center, 2807 Binion Rd., Apopka, FL 32703.
Application of benodanil as foliar sprays to philodendron, dwarf
schefflera, and grape ivy had no obvious effect on growth of the plant.
Although residue severity increased as rate of benodanil increased, plant
quality remained unaffected by treatment with this fungicide. Similarly,
drench applications of benodanil did not alter growth of 'Silver Queen,
'Mauna Loa', 'White Butterfly', or Japanese aralia (Table 1). Use of
benodanil on eleven species of foliage plants has been safe as either a
drench or foliar application.
Table 1. Effect of benodanil drenches on growth of Syngonium podophyllum
'White Butterfly' and Spathiphyllum sp. 'Mauna Loa'.
Treatmentz Level height(in) Fresh weight-tops and roots (g)
oz/100 gal 'White Butterfly 'Mauna Loa' 'White Butterfly' 'Mauna Loa'
Water 10.1 21.1 304 123
Benodanil-4 10.4 21.2 297 131
Benodanil-8 10.6 22.1 327 132
ZTreatments were applied at 1 pint/ft2, twice, 6 weeks apart. Final
ratings were made 2 weeks after the second application.