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Table 5.2. Fungicides for control of diseases of herbaceous
perennials
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Common Name
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Commercial Application
Information
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Effective Against
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REI§
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azoxystrobin
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Alternaria, anthracnose, Botrytis blight, Cladosporium leaf spot, downy mildew, Fusarium
spp., iris leaf spot, Phytophthora shoot blight,
powdery mildew, rust, Rhizoctonia, Sclerotium rolfsii
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12
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Conduct small-scale
tests for species not mentioned on label. For resistance management, do not
make more than three applications of Heritage before alternating with a
fungicide of a different mode of action (i.e., use materials other than
†Cygnus or Compass O). Do not exceed eight applications/crop/year or 10 lb.
product/crop acre/year. Do not use silicone-based surfactants. Some Malus are injured by azoxystrobin.
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Bacillus subtilis
(MBI-600)
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Plant into
Pro-Mix with Biofungicide, peat-lite
mix that contains Bacillus subtilis MBI 600. Follow
all instructions on the label.
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Pythium and Rhizoctonia
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0
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Registered
for use on ornamentals
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Bacillus subtilis
(GB03)
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Apply 16
fl oz of Companion/100 gal. as soil drench,
retreating at 14-day intervals, with dosage according to label instructions.
Contains Bacillus subtilis GB03.
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Pythium and Rhizoctonia
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4
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Registered
for use on ornamentals in greenhouse (protected environments)
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Bacillus subtilis
(QST 713)
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Apply 2-8 quarts
of Rhapsody AS/100 gal/A at 3- 10-day intervals.
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Bacterial
leaf spots, Alternaria, Botrytis, Cercospora, Helminthosporium,
Myrothecium, Septoria,
powdery mildew
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4
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Registered
for use on ornamentals. Conduct small-scale preliminary trials to check
cultivar sensitivity before using on a large number of plants.
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chlorothalonil+
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Spray 1.4
lb. Daconil Ultrex
82.5%/100 gal. or 1-3/8 pt. Daconil
Weather Stik Flowable
Fungicide 54EC /100 gal. at 7- to 14-day intervals.
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Botrytis,
Alternaria, Cercospora,
Volutella, Septoria
and Didymellina leaf spots, Mycosphaerella
ray blight, rust, anthracnose, Rhizoctonia web
blight, powdery mildew
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12
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Registered
for use on chrysanthemum, daisy, gladiolus, gypsophila, hollyhock, iris,
lily, pachysandra, phlox, statice, and tulip
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chlorothalonil+
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Spray
Concorde DF at 1.0–2.5 lb. or Concorde at 1.37 pt./100
gal. Repeat at 7- to 14-day intervals.
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Alternaria, Botrytis, Cercospora,
Corynespora, Didymellina,
Myrothecium, Phyllosticta,
Ramularia and Septoria
leaf spots, Mycosphaerella ray blight, Rhizopus blossom blight, rust, anthracnose, Rhizoctonia web blight, Stagonospora
leaf scorch, powdery mildew
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12
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Registered
for use on chrysanthemum, crocus, daffodil, daisy, geranium, gladiolus,
hollyhock, hydrangea, iris, lily, narcissus, pansy, phlox, statice, and tulip
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chlorothalonil+
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Spray Echo
720 Turf and Ornamental at 1 3/8 pt. or Echo 90DF Turf and Ornamental at 0.8
lb./100 gal. Repeat at 7- to 14-day intervals.
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Alternaria, Botrytis, Cercospora,
Didymellina and Septoria
leaf spots, Mycosphaerella ray blight, rust,
anthracnose, Rhizoctonia web blight, powdery mildew
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12
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Registered
for use on chrysanthemum, crocus, daffodil, daisy, geranium, gladiolus,
hollyhock, hydrangea, iris, lily, narcissus, pansy, phlox, statice, and tulip
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chlorothalonil+
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Spray
Manicure Ultrex at 1.0–2.5 lb./100
gal. Repeat at 7- to 14-day intervals.
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Alternaria, Botrytis, Cercospora,
Didymellina and Septoria
leaf spots, Mycosphaerella ray blight, rust,
anthracnose, Rhizoctonia web blight, Sclerotinia flower blight, powdery mildew
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48
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Registered
for use on carnation, chrysanthemum, crocus, daffodil, daisy, geranium,
gladiolus, hollyhock, hydrangea, iris, lily, narcissus, pansy, phlox, statice, and tulip
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chlorothalonil plus thiophanate-methyl
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Apply Spectro 90WDG according to label.
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Alternaria, anthracnose, Ascochyta,
Botrytis, Cercospora, Didymellina, Phytophthora
blight, powdery mildew, Ramularia, Rhizoctonia web blight, rust, Septoria
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12
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Registered
for use on aster, carnation, chrysanthemum, daffodil, daisy, gladiolus,
gypsophila, iris, lily, narcissus, pansy, phlox, statice,
and tulip
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copper
hydroxide
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Spray Kocide DF at 1–3 lb./A (1 Tbsp. Kocide DF/1,000 sq. ft. = 1 lb./A) at 7- to 14-day
intervals. Do not apply in spray solution with a pH less than 6.5 because phytotoxicity may result. Must have product with
ornamentals listed on the label.
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Bacterial
and fungal leaf spots
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24
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Registered
for use on aster, dahlia, delphinium, dianthus, echinacea,
geranium, gladiolus, iris, Easter lily, narcissus, peony, phlox, hosta, tulip, verbena, and viola
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copper
hydroxide
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Spray Kocide 4.5 LF at 2/3–2 pt./A (1
Tbsp. Kocide 4.5 LF/1,000 sq. ft. = 1 pt./A) at 7-
to 14-day intervals. Must have product with ornamentals listed on the label.
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Bacterial and
fungal leaf spots
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24
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Registered
for use on aster, dahlia, delphinium, dianthus, echinacea,
geranium, gladiolus, iris, Easter lily, narcissus, peony, phlox, hosta, tulip, verbena, and viola. Do not apply in spray
solution with a pH less than 6.5 because phytotoxicity
may result.
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copper
hydroxide
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Spray
Nu-Cop 50 WP at 1 lb./100 gal. at
7- to 14-day intervals.
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Anthracnose,
Botrytis, Septoria
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24
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Registered
for use on chrysanthemum, Easter lily, gladiolus, and tulip. Do not apply in spray
solution with a pH less than 6.5 because phytotoxicity
may result.
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copper
hydroxide
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Spray
Champ Dry Prill at 2/3 lb./100
gal. at 7- to 14-day intervals.
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Bacterial
and fungal leaf spots
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24
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Registered
for use on chrysanthemum, dahlia, Easter lily, echinacea,
geranium, gladiolus, hosta, iris, phlox, pansy,
peony, tulip, and verbena. Do not apply in spray solution with a pH less than
6.5 because phytotoxicity may result.
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copper
hydroxide
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Spray 1.0 lb.
Champion 77% WP/100 gal. Repeat in 7–14 days as needed.
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Botrytis,
Septoria leaf spot
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24
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Registered
for use on chrysanthemum
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copper
hydroxide
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Spray 0.75
lb. Kocide 2000 per 100 gal. Repeat in 7–14 days as
needed. Do not apply in a spray solution
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Alternaria leaf spot, bacterial spot, Botrytis,
Cercospora, downy mildew, Septoria
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24
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Crops
listed on the label include chrysanthemum, dahlia, dianthus, echinacea, gladiolus, iris, pansy, peony, plantain lily (hosta), and verbena. Label cautions grower to conduct
small-scale tests on other ornamentals not listed on the label for signs of phytotoxicity before commercial use.
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copper
hydroxide plus mancozeb
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Spray 1.5
lb. Junction/100 gal. water (1/2 Tbsp./gal.). Repeat
at 7- to 14-day intervals.
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Alternaria leaf spot, anthracnose, bacterial leaf blight,
Botrytis, Cercospora, downy mildew
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24
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The pH of the
spray solution should be less than 6.5 to avoid phytotoxicity.
Label cautions grower to test this product for safety to plants not listed on
the label. Listed plants include dahlia, gladiolus, pansy, peony, and tulip.
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copper
salts of fatty and rosin acids
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Spray 3
tbsp../gal. Camelot (= 3 pt./100
gal.) at 7- to 10-day intervals.
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Bacterial
blight on chrysanthemum, scab on iris
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12
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Do not mix
with products containing diazinon, thiophanate-methyl, or fosetyl-Al.
Registered for use on chrysanthemum and iris.
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copper sulphate pentahydrate
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Spray
1.5–2.5 oz. Phyton 27 21.36%/10 gal.
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Bacterial
leaf spots, Botrytis, powdery mildew
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24
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Registered
for use on aster, chrysanthemum, clematis, hydrangea, peony, and potentilla
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etridiazole
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Drench
containers with 3–10 oz. Terrazole 35WP/100 gal./400 sq. ft. For bedding plants (2- to 3-in. soil depth)
drench with 4–6 oz. Terrazole 35% WP/100 gal./800
sq. ft.
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Pythium, Phytophthora
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12
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Registered
for use on aster, chrysanthemum, dahlia, dianthus, foxglove, gypsophila,
salvia, statice, and stokesia
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etridiazole
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Drench 3–10
oz. *Truban 30WP/100 gal., the area to be covered
varying with depth of soil treated. Repeat in 4–12 weeks.
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Pythium, Phytophthora
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12
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Registered
for use on aster, dahlia, dianthus, foxglove, gypsophila, salvia, statice, and stokesia
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etridiazole
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Drench 3–8
oz. Truban 25EC/100 gal., the area to be covered
varying with depth of soil treated.
Repeat in
4–12 weeks if needed.
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Pythium, Phytophthora
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12
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Registered
for use on ajuga, chrysanthemum, dahlia, dianthus,
phlox, and salvia
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etridiazole plus thiophanate-methyl
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Drench
4–12 oz. Banrot 40WP/100 gal./400–800
sq. ft. at 4- to 12-week intervals. Rates vary according to container depth.
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Rhizoctonia, Pythium, and Phytophthora stem and root rots
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12
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Registered
for use on ajuga, aster, chrysanthemum, dahlia,
delphinium, fern, gypsophila, lobelia, phlox, salvia, and statice
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etridiazole plus thiophanate-methyl
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Mix 8 or16
oz. Banrot 8G/cu. yd. soil mix, depending on
container depth and type of plant grown. See label for broadcast and sidedress applications.
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Rhizoctonia, Pythium, Phytophthora, and Fusarium
damping-off and stem rots
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12
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Registered
for use on ajuga, aster, chrysanthemum, dahlia,
delphinium, gypsophila, phlox, and statice
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fenhexamid
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Spray
0.75–1.5 lb. Decree 50 WDG/100 gal. at 7- to 14-day
intervals.
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Botrytis
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12
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Registered
for use on outdoor-grown and greenhouse ornamentals. Avoid making more than two
consecutive applications: rotate with another product that has a different
mode of action.
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fludioxonil
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Spray *ΔMedallion 50WP using 1–2 oz/100 gal. for Alternaria, Septoria, and Rhizoctonia.
For Botrytis, use 2-4 oz/100 gal. Repeat at 7-to 14-day intervals.
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Alternaria leaf spot, Botrytis, Rhizoctonia web blight, Septoria
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12
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For soilborne disease, drench *Δ Medallion 50WP using 1
oz/100 gal. Make only one application to a seedling crop; drench transplants
at 21- to 28-day intervals. Use up to 30 oz. *ΔMedallion
per 1,000 sq. ft. (80 lb. product/acre) per year or crop cycle.
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Rhizoctonia, Myrothecium and Thielaviopsis root rot
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12
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The label lists aster,
bleeding heart (foliar application), chrysanthemum, coreopsis (foliar),
dahlia (foliar), daisy (foliar), pansy, salvia, sunflower (foliar), and
verbena and suggests that growers should test unlabeled plants for phytotoxicity before widespread use. For greenhouse use
only. Use in Nassau and Suffolk Counties is restricted to enclosed
structures only.
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fludioxonil + mefenoxam
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Drench
Hurricane at seeding at ¾ oz per 100 gal, on transplants and cuttings use 1.5
oz per 100 gal in a volume to wet the entire root zone. Drench treatments qualify
for an exception to the REI: see label for details. Pythium
and Phytophthora strains that are
insensitive to Subdue MAXX are also insensitive to Hurricane.
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Rhizoctonia, Pythium
and Phytophthora
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48
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fludioxonil + mefenoxam
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Drench Hurricane
at seeding at ¾ oz per 100 gal, on transplants and cuttings use 1.5 oz per
100 gal in a volume to wet the entire root zone. Drench treatments qualify
for an exception to the REI: see label for details. For these pathogens add
*Triangle Medallion fungicide at 1.0 oz per 100 gal as a tank mix.
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Cylindrocladium, Thielaviopsis,
Fusarium, and Sclerotium
rolfsii
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48
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flutolanil
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Spray 3 to
6 oz of Contrast 70WSP/100 gal P at 14- 21-day intervals, applying no more
than 2 applications per acre per year or no more than 4.2 pounds a.i. per acre per year. Not for foliar application in
Nassau or Suffolk counties.
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Rust
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12
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Registered
for use on ornamentals, including chrysanthemum, hollyhock, and iris
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flutolanil
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Spray 3 to
12 oz of Contrast 70SP/100 gal P at 14- 21-day intervals, applying no more
than 2 applications per acre per year or no more than 4.2 pounds a.i. per acre per year. Not for foliar application in
Nassau or Suffolk counties.
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Rust
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12
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Registered
for use on ornamentals, including chrysanthemum, hollyhock, and iris
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fosetyl-Al+
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Spray Aliette WDG at 2–5 lb./100 gal.
at one-month intervals or drench at 0.4 to 0.8 lb./100 gal./400 sq. ft.
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Downy
mildew, Phytophthora, Pythium
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12
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Registered
for use on ornamentals in nursery and greenhouse
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hydrogen
dioxide
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Apply ZeroTol 27% as directed on label.
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Powdery
mildew, algae control, disinfestant
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0
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Registered
for use in prevention and control of horticultural diseases in commercial greenhouses,
garden centers, landscapes, nurseries and interiorscapes
on bedding plants, flowering plants, roses, poinsettia, ornamentals, nursery
stock, cut flowers, bulbs, cuttings, seedlings, and seeds
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iprodione
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Spray 1.0–2.5
lb. *Chipco 26019 50WP or *Iprodione
Pro 2SE or 1.0–2.5 qt. *Chipco 26019 Flo (Bayer),
*26GT Flowable, or *Sextant/A at 10- to 14-day
intervals.
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Alternaria, Ascochyta
ray blight, Botrytis, ink spot,
Rhizoctonia web blight, Stagnospora
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12
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Registered
for use on ajuga, artemisia,
aster, chrysanthemum, columbine, dahlia, delphinium, dianthus, gypsophila, heuchera, iris, lilies, monarda,
pachysandra, periwinkle, phlox, poppy, salvia, statice,
and violet
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iprodione
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Drench 6.5
oz. *Chipco 26019 50WP or *Iprodione
Pro 2SE/100 gal., OR drench 13 fl. oz. Chipco Flo
or *26GT (Bayer) or *Sextant/100 gal. at 14-day
intervals after transplant. A corm dip is registered for control of Fusarium corm rot of gladiolus.
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Rhizoctonia, Fusarium
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12
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Registered
for use on ajuga, artemisia,
aster, chrysanthemum, columbine, dahlia, delphinium, dianthus, gypsophila, heuchera, iris, lilies, monarda,
pachysandra, periwinkle, phlox, poppy, salvia, statice,
and violet
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kresoxim-methyl
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Spray
†Cygnus 50W at 1.6–3.2 oz./100 gal. to drip.
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Powdery
mildew, leaf spots, rust
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12
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For greenhouse use. Test on a
sample of the crop to be treated. For resistance management, do not make more
than eight greenhouse applications per year. Do not make more than two
sequential applications of †Cygnus. Then alternate to an equal number of
sequential applications of a non-strobilurin
fungicide (i.e., do not rotate with or Compass O). Do not use organosilicone-based adjuvants
with †Cygnus.
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mancozeb
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Spray 1.5
lb./100 gal. Dithane T/O Rainshield or *Fore 80WP, at 7- to 10-day intervals as
needed.
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Botrytis,
rust, Cercospora and Didymellina
leaf spots, foliar Phytophthora blight (peony)
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24
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Test on a
small sample before large-scale application to ornamentals not listed on the
labels. Adding Latron B-1956 spreader-sticker is
recommended for improved performance.
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mancozeb
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Spray 1.5
lb. Protect T/O/100 gal. at 7- to 10-day intervals.
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Alternaria, anthracnose, Ascochyta
and Botrytis blights, Cercospora, Didymellina downy mildew, Mycosphaerella,
Phyllosticta, Phytophthora
dieback, Rhizoctonia web blight, rusts, and Septoria leaf spots, Volutella
blight
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24
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Registered
for use on Boston ivy, chrysanthemum, columbine, dahlia, delphinium, dianthus,
English ivy, geranium, gladiolus, gypsophila, iris, lily, liriope,
lobelia, pachysandra, pansy, peony, periwinkle, phlox, santolina,
salvia, senecio, shasta
daisy, statice, strawflower, and verbena
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mancozeb + copper hydroxide
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Spray
1.5–3.5 lb./A Junction at 7- to 14-day intervals as
needed.
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Alternaria, anthracnose, bacterial leaf spot, Botrytis,
Cercospora, downy mildew, fungal leaf spot, Phytophthora blight, powdery mildew, Septoria
leaf spot
|
24
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|
Test on a small
sample before large-scale application to ornamentals not listed on the label.
Do not apply in a spray solution with pH lower than 6.5. Incompatible with fosetyl-Al or thiophanate-methyl
materials.
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mancozeb plus thiophanate-methyl
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Spray 1.5
lb. *Zyban WSB/100 gal. at
7- to 10-day intervals.
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Anthracnose,
Botrytis, downy mildew, leaf spots, powdery mildew
|
|
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Registered
for use on aster, chrysanthemum, dahlia, liriope, mondo grass, pansy, phlox, and verbena
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mefenoxam
|
Use Subdue
MAXX through irrigation, as a drench, a soil surface spray, or incorporate
into mix.. Rates for Subdue MAXX start as low as
0.13 fl. oz./100 gal. for
drench at seeding.
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Phytophthora, Pythium
|
0
|
|
Registered
for use on ornamentals, including bedding plants and flowers. Label cautions
the grower to conduct tests for safety to plants not mentioned on the label
before widespread use. To minimize the potential for control failure on
insensitive strains, use mefenoxam or metalaxyl in alternation with other active ingredients
for Pythium and Phytophthora
control.
|
|
metalaxyl
|
Subdue II
is available in a drench-pac product from W. A.
Cleary, packaged with 3336 in water-soluble bags. Subdue GR is a granular
formulation that may be incorporated in a mix or applied to the soil surface.
Reapply in 1–2 months.
|
Phytophthora, Pythium
|
0
|
|
Registered
for use on ornamentals, including artemisia, aster,
baby’s breath, chrysanthemum, columbine, delphinium, foxglove, gaillardia,
pansy, phlox, pinks, primrose, salvia, sedum, sempervivum,
Shasta daisy, and verbena. Label cautions grower to conduct tests for safety
to plants not mentioned on the label before widespread use. To minimize the
potential for control failure on insensitive strains, make no more than three
applications per season. Use mefenoxam or metalaxyl in alternation with other Pythium/Phytophthora controls.
|
|
neem oil
(clarified
extract of)
|
Use 1:200
to 1:100 concentration (0.5%–1.0%) Triact 70EC at 7- to 14-day intervals.
|
Powdery
mildew and other diseases
|
4
|
|
Registered
for use on landscape, greenhouse, and nursery ornamentals. Test for safety on
your crops.
|
|
PCNB
|
Drench 6–12
fl. oz. Terraclor 400 40F/100 gal to cover 400–800
sq. ft., or as directed by label, or Terraclor 75WP
at seeding or transplanting.
|
Rhizoctonia, |