Group Title: CFREC-Apopka research report
Title: 1991 Fungicide tests for control of foliar diseases caused by Botrytis, Corynespora, Fusarium, and Powdery Mildew on ornamentals
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Permanent Link: http://ufdc.ufl.edu/UF00065321/00001
 Material Information
Title: 1991 Fungicide tests for control of foliar diseases caused by Botrytis, Corynespora, Fusarium, and Powdery Mildew on ornamentals
Series Title: CFREC-Apopka research report
Physical Description: 7 p. : ill. ; 28 cm.
Language: English
Creator: Chase, A. R ( Ann Renee )
Mellich, T. A ( Terri A. ), 1958-
Central Florida Research and Education Center--Apopka
Publisher: University of Florida, Central Florida Research and Education Center-Apopka
Place of Publication: Apopka FL
Publication Date: 1992
 Subjects
Subject: Foliage plants -- Diseases and pests -- Control -- Florida   ( lcsh )
Fungicides -- Testing -- Florida   ( lcsh )
Plants, Ornamental -- Diseases and pests -- Control -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: A.R. Chase and T.A. Mellich.
General Note: Caption title.
 Record Information
Bibliographic ID: UF00065321
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 - 70152727

Full Text




SBotrytis, Corynespora, Fusarium, and Powdery Mildew of- iiAts

A.R. Chase and T.A. Mellich1 Sp 3 0 1994

University of Florida, IFAS, f lorida
Central Florida Research and Education CenteD'i~ai oida
CFREC-Apopka Research Report, RH-92-4

Fungicides have continued to play an important role in disease control strategies for many
ornamental producers. New fungicides whose activity ranges are not currently known are
becoming available for testing on ornamental crops. In addition, tests designed to help expand
the labels of registered fungicides are an integral part of the CFREC-Apopka fungicide research
program. The diseases caused by fungi which were researched during the past year were:
Botrytis blight of geranium, Corynespora leaf spot of lipstick vine, Fusarium leaf spot ol
dracaena, and powdery mildew of gerber daisy.

Botrytis Blight of Geranium

Botrytis blight of geranium (Pelargonium hortorum) is caused by Botrytis cinerea which
is a pathogen of most flowering and foliage crops. Two tests were performed in 1991. In tesi
1, plants were sprayed with fungicides to the point of drip on a weekly interval between 18 Jul)
and 1 August 1991. Treatments included EXP10064B (a numbered compound from Rhone
Poulenc) at two rates (2 and 4 oz per 100 gal), iprodione (Chipco 26019 50WDG) at two rate.
(16 and 32 oz per 100 gal), a mixture of EXP10064B and iprodione (2 and 16 oz per 100 gal
respectively), a mixture of EXP10221 (a numbered compound from Rhone Poulenc) anc
iprodione (2 and 16 oz per 100 gal, respectively), and chlorothalonil (Daconil 2787 75WP at 24
oz per 100 gal). Control plants were sprayed with water only. Plants were naturally infected
with B. cinerea by 7 August at which time the number of active lesions per plant wa.
determined. All of the treatments gave a good degree of control of Botrytis blight on geraniurn
without any evidence of phytotoxicity (Fig. 1).

The second test was performed with the following treatments: noninoculated and
inoculated controls sprayed with water, thiophanate methyl (Domain FL at 20 oz per 100 gal)
chlorothalonil (Daconil 2787 90WDG at 20 oz per 100 gal), and ASC-66825 (a numbered
compound from ISK Biotech) at two rates (4 and 16 oz per 100 gal). Treatments were applied
by spraying to drip weekly from 16 January to 6 February 1992. Plants were inoculated witt
spores of B. cinerea on 31 January although, within 1 week, it became evident that all plant,








Corvnesnora Leaf Soot of Linstick Vine


rynespora leaf spot is the most common


.,1u.u Lm.cL wa- piiu L icu lalCL 1 71 M L71 U
gal), two rates of ASC-66825 (at 4 anm
ammonium product (Greenshield at 2 ar
-rntrml nlnntv tzyara vrvnYaAP ix.lyi xim+v ^"


-d 4 oz per 00 gal). Nc
Id 4 oz per 100 gal). Nc


I to 18 December 1991 except for Greenshield which was applied daily from 4 to 21
Plants were inoculated with a spore suspension on 6 December and rated for the
esions on 23 December. Manzate 200 gave little disease control in this test. Optir
vas achieved with weekly applications of ASC-66825 at the 4 oz rate or daily app]
he quaternary ammonium product at the 2 oz rate (Fie. 4). Daily annlications of the


degree of nhvtotoxicitv which nrnvided mnre infpr.t


itrol was achieved with chlorothalonil or the combination of thiol
although the higher rate of ASC-66825 and the lower rate
,nrn n nm fr^A wn --- anh. 4-f1 fA A7:nr r C% lL.. -I








to development of a low level of phytotoxicity as noted on lipstick vine.

Powdery Mildew on GerberDaisy


Allowing conclusions are ba
products whenever possible


sed on the test
e. The numbc


:s reported in this paper ani


DC1L .UIIL[UI ULI DUUlLIS UI1 giVjiuWUIII wa I dii.cvcu wILI wccr y apljJiuuIL.u
Chipco 26019, EXP 10064B or ASC-66825 with good control also given 1

Excellent control of Corvnesvora leaf snot of lipstick vine was achieved








Figure 1. Effect of fungicides for control of Botrytis blight of geranium (Test 1).


SAverage active lesions/plant
2



1.5







0.5




Water 10064B 10064B Chlpco Chlpco Chlpco Chipco Daconil
control 2 oz 4 oz 16 oz 32 oz 10064B 10221 24 oz

Treatment



Figure 2. Effect of fungicides for control of Botrytis blight of geranium (Test 2).

Average no. leaves with active lesions
1.6 -

1.4

1.2

1

0.8

0.6

0.4

0.2


Nonlnoc Inoc Domain Daconil 66825 66825
ulated ulated 20 oz 20 oz 4 oz 16 oz

Treatment



A








Figure 3. Effect of fungicides on control of Corynespora leaf spot of lipstick vine.

Average lesions per plant
25


Noninoc Inoc
ulated ulated


Daconil Daconll 66791 66791 Zyban
20 oz 40 oz 32 oz 64 oz 24 oz


Treatment



Figure 4. Effect of fungicides and a quaternary ammonium product on control of Corynespora
leaf spot of lipstick vine.


Average lesions


per plant


Noninoc Inoc Manzate 66825
ulated ulated 24 oz 4 oz


Treatment


66825 Greensh Greensh
16 oz 2 oz 4 oz








Figure 5. Effect of fungicides and a quaternary ammonium product on control of Fusarium leaf
spot of dracaena.


Average


lesions per plant


Inoc Zyban
ulated 24 oz


66825 66825 GreenshGreenshGreensh Daconll
4 oz 16 oz 1 oz 2 oz 4 oz 20 oz


Treatment


Figure 6. Effect of fungicides on control of powdery mildew on gerber daisy.


% Leaf area affected by powdery mildew
70


Water Daconll Daconil 66825 66825
control 20 oz 40 oz 4 oz 16 oz

Treatment


66900 66900
25 oz 60 oz


Nonlnoc
ulated









Figure 7. Effect of fungicides on height of gerber daisy.

Average height (in)
61


Water Daconil Daconll
control 20 oz 40 oz


66825
4 oz

Treatment


66825 66900 66900
16 oz 25 oz 50 oz


Figure 8. Effect of fungicides on phytotoxicity on gerber daisy.


Average phytotoxicity
."4


U
Water Daconill Daconll 66825 66825
control 20 oz 40 oz 4 oz 16 oz

Treatment
1 no phytotoxiclty and 5 dead plant


66900 66900
25 oz 50 OZ




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