Group Title: AREC-Apopka research report
Title: Fungicide trials on foliage plants
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Permanent Link: http://ufdc.ufl.edu/UF00065318/00001
 Material Information
Title: Fungicide trials on foliage plants summary 1986
Series Title: AREC-Apopka research report
Physical Description: 5 p. : ; 28 cm.
Language: English
Creator: Chase, A. R ( Ann Renee )
Agricultural Research and Education Center (Apopka, Fla.)
Publisher: University of Florida, Agricultural Research and Education Center-Apopka
Place of Publication: Apopka FL
Publication Date: 1986
 Subjects
Subject: Foliage plants -- Diseases and pests -- Control -- Florida   ( lcsh )
Fungicides -- Testing -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: A. R. Chase.
General Note: Caption title.
 Record Information
Bibliographic ID: UF00065318
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 70118201

Full Text




Fungicide Trials on Foliage Plants Supmtay_-""Q"
SJ Centra! Science
A. R. Chase | ihrr
University of Florida, IFAS
Agricultural Research and Education Center ApopaT 1! i; 7
AREC-Apopka Research Report, RH-86-21

New compounds and new uses for established compounds are continuing
concerns for the foliage plant producer. Research at the AREC-Apopka is
conducted annually to evaluate new compounds as they become available, as
well as aid label expansion for established compounds to encompass
additional crops and/or new pests. During the 1985-1986 trials, benodani
(Mallinckrodt, Inc.), Chipco 26019 formulations (Rhone-Poulenc, Inc.), an,
Spotless (Chevron Chemical Co.) were evaluated for control of several
fungal root and foliage diseases. Benodanil 50WP was tested on Boston fe'
(Nephrolepis exaltata) for control of Rhizoctonia aerial blight
(Rhizoctonia sp.). Chipco 26019 50WP and 2F were tested for control of
Phyllosticta leaf spot of Peperomia and Fusarium leaf spot of Dracaena
marginata. Spotless 25WP was tested on Spathiphyllum 'Queen Amazonica' f
Cylindrocladium root and petiole rot control, on dwarf schefflera
(Schefflera arboricola) for Alternaria leaf spot control, and Calathea
argentea for Bipolaris leaf spot control.

TRIALS AND RESULTS

Efficacy of Benodanil for control of Rhizoctonia aerial blight of Boston
fern 'Compacta'. Two tests were performed to determine the efficacy of
benodanil on Boston fern for control of Rhizoctonia aerial blight. Bosto
Compacta ferns were obtained and established in steam-treated Canadian pe
and pine bark (1:1, v/v) in 6 inch pots. Both tests were performed in a
glasshouse with a maximum of 1500 ft-c light and temperatures ranging fro
700 to 100F. In the first trial treatments were benodanil applied as a
drench at 4, 6, or 8 oz ai/100 gal or a foliar spray at 8, 12, or 16 oz
ai/100 gal. Benomyl (Benlate 50WP) was also tested as a drench or a spra
at 8 oz ai/100 gal as well as appropriate controls. Applications were ma
every 3 weeks for a total of 3 applications, with the first made prior to
inoculation with Rhizoctonia sp. Plants were exposed to intermittent
misting (5 sec/30 min, 8:00 am to 6:00 pm) starting 1 day before
inoculation and continuing until test completion. Disease was rated by
estimating the percentage of the foliage area showing symptoms of aerial
blight on 22 July and 28 July, 1986. Excellent disease control was
achieved with foliar sprays of benodanil at all rates tested (Table 1).
Drench applications of benodanil were more effective in disease control
than the drench application of benomyl, with the 8 oz ai/100 gal rate as
effective as the spray applications of both benodanil and benomyl. The








The second trial with benodanil tested the duration of control
possible from a single drench application at 8 oz ai/100 gal. Treatments
were applied once every 2 weeks to separate sets of test plants starting
25 June and ending on 28 August, 1986. All plants were then inoculated
with Rhizoctonia sp. on 31 August and rated on 5 September for mean area
plant foliage with symptoms of Rhizoctonia aerial blight. The longer the
time lapse between the drench application and inoculation, the lower the
degree of disease control (Table 2). Benodanil provided excellent disease
control for at least 3 weeks but began to lose efficacy after 5 weeks. A
week interval between treatments appears to be optimal for controlling
Rhizoctonia aerial blight on Boston fern grown during the summer under
glass.

Efficacy of Chipco 26019 formulations for Fusarium leaf spot of Dracaena
marginata. Chipco 26019 50WP was applied weekly for 6 weeks at 4, 8, and
12 oz ai/100 gal. Dracaenas were grown in a shadehouse receiving
approximately 4000 ft-c light intensity and temperatures ranging from 70
to 100F. Dracaenas were inoculated with 1 x 10 conidia/ml of Fusarium
moniliforme 3 days after the initial fungicide application. Ratings,
consisting of number of lesions, were taken periodically. Excellent
control of Fusarium leaf spot occurred on plants treated with either 8 or
12 oz ai/100 gal of Chipco 26019 50WP (Table 3).

Efficacy of Spotless 25WP for Cylindrocladium root and petiole rot,
Alternaria leaf spot and Bipolaris leaf spot. Spotless 25WP was tested f
control of Cylindrocladium spathiphylli on Spathiphyllum 'Queen Amazonica
under the environmental conditions described for benodanil tests, except
misting was not used in this trial. Spotless was applied at 0.5, 1, 2,
4 oz ai/100 gal as a drench on a weekly interval for 8 weeks. The5pottin
medium of plants was inoculated with a conidial suspension (1 x 10 /6 inc
pot) 3 days after the first fungicide treatment. The percentage of folia
showing symptoms of disease was recorded on 11 and 17 June, 1986.
Excellent disease control was achieved with the highest rate of Spotless
while lower rates provided significant but lower levels of control (Table
4).

The rates given above were also tested for efficacy against Alternar
panax on dwarf schefflera and Bipolaris setariae on Calathea argentea.
Plants were grown as described for benodanil tests. Treatments were
applied -to foliage 3 times on weekly intervals with inoculation 3 days
after the first application. Dwarf schefflera were inoculated with 1 x 1
conidia/ml of A. panax while Calatheas were inoculated with 1 x 10
conidia/ml of F. setariae. The mean number of lesions were recorded afte
the final fungTcide application. Moderate levels of control were achieve
with all rates of Spotless on dwarf schefflera infected with A. panax
(Table 5). In contrast, excellent control of Bipolaris leaf spot of
Calatheas occurred with all rates of Spotless (Table 5).








CONCLUSIONS

iodanil 50WP provides excellent control of Rhizoctonia aerial blight
Boston fern under glasshouse conditions when used on a 3 week
terval as a foliar spray (8 oz ai/100 gal). Mallinckrodt has applied
r a label for this use on foliage plants.

ipco 26019 50WP provides good control of Fusarium leaf spot of
icaena as a foliar spray at 12 oz ai/100 gal. Rhone-Poulenc has
own interest in expanding the label to include additional plants and
rget pests.

otless 25WP provides excellent control of Cylindrocladium root and
tiole rot of Spathiphyllum when used as a soil drench once a week at
oz/1OO0 gal. The compound also gives excellent control of Bipolaris
if spot of Calathea when used as a weekly foliar spray at rates as
wi as 0.5 oz ai/100 gal but gives only slight control of Alternaria
if spot on dwarf schefflera even at the 4 oz ai/100 gal rate. The
position of this compound is unknown at present.



i of a commercial or proprietary product or pesticide in this paper
ot constitute a recommendation by the authors nor does it imply
ration under FIFRA as amended. Pesticides should be applied
ing to the label instructions and safety equipment required on the
or by federal law should be employed.




1. Effect of application rate and method on efficacy of benodanil and
nomyl against Rhizoctonia aerial blight of Boston fern.

Rate Application Mean percentage of leaf area with sympto
entx (oz ai/100 gal) method 28 July


culated control --- 0 a
cited control --- 63.3 d
nil 8 spray 0.3 a
nil 12 spray 0.1 a
nil 16 spray 0.1 a
nil 4 drench 13.0 b
nil 6 drench 12.9 b
nil 8 drench 3.7 ab
1 8 spray 3.6 ab










Application Mean percentage of leaf
Treatments date area with symptoms (5 September)

Noninoculated control 0 ay
Inoculated control 20.5 c
Benodanil 25 June 16.0 c
Benodanil 9 July 17.5 c
Benodanil 23 July 13.0 bc
Benodanil 6 August 5.5 ab
Benodanil 20 August 5.0 ab
Benodanil 28 August 3.8 ab


XTreatments were applied as a drench (8 oz ai/100 gal) at the rate of 1
pint/sq ft.

YMean separation by Duncan's new multiple range test, P=0.05.





Table- 3. Efficacy of Chipco 26019 50WP against Fusarium leaf spot of
Dracaena marginata.

-Rate Mean number of lesions/plant
Treatment (oz ai/100 gal) (15 August)

Noninoculated control 0.8 ay
Inoculated control 16.7 c
Chipco 50WP 4 8.7 b
Chipco 50WP 8 4.1 ab
Chipco 50WP 12 1.8 ab


XTreatments were applied weekly for a total of 6 weeks.

YMean separation by Duncan's new multiple range test, P=O.05.


.a ,lIUll LIlllll







le 4. Efficacy of Spotless 25WP against Cylindrocladium root and
petiole of Spathiphyllum 'Queen Amazonica'.

Rate Mean percentage of foliage showing symptoms
atmentX (oz ai/100 gal) 17 June


inoculated control 1.2 ay
culated control 49.1 c
less 25WP 0.5 14.1 b
less 25WP 1.0 14.3 b
less 25WP 2.0 10.0 b
less 25WP 4.0 2.4 a


eatments were applied weekly for a total of 8 weeks at the rate of
proximately 1 pint/sq ft.

an separation by Duncan's new multiple range test, P=0.05.





le 5. Efficacy of Spotless 25WP against Alternaria leaf spot of
Schefflera arboricola (dwarf schefflera) and Bipolaris leaf spot
of Calathea argentea 'Silver Portrait'.

Mean number of lesions
Rate Alternaria Bipolaris
atmentx (oz ai/100 gal) (Schefflera) (Calathea)


inoculated control 1.0 ay 2.5 a
culated control 54.6 c 21.5 b
less 25WP 0.5 20.0 b 3.8 a
otless 25WP 1.0 19.1 b 3.2 a
less 25WP 2.0 21.2 b 1.0 a
less 25WP 4.0 20.3 b 1.6 a


eatments were applied weekly for a total of 3 weeks by spraying to




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