Pythium Damping Off, Root and Stem Rot

Avoid using a mix with poor drainage (and consequent low air pore space). Avoid excessively high levels of soluble salts in the growing mix. Use a bench surface that does not allow puddling at the base of the pots. Handle and store mix carefully to avoid contamination with unpasteurized soil. The following fungicides are labeled in New York for the control of this disease on the plants specified:

cyazofamid

* Segway 34.5EC

71512-13-279

12

Comments: For use as a drench on ornamentals grown in containers or beds in greenhouses, nurseries and landscapes . Do not make more than two applications per crop cycle. Drench volumes for particular pot sizes are given on label.

etridiazole

Terrazole 35WP

400-416

12

*Truban 30W

58185-7

12

*Truban 25EC

58185-8

12

Bedding Plants: ageratum, alyssum, aster, balsam, begonia, calendula, carnation, celosia, coleus, dahlia, dianthus, foxglove, impatiens, larkspur, marigold, pansy, petunia, portulaca, salvia, snapdragon, stokesia, verbena, vinca, zinnia

Foliage Plants: aglaonema, anthurium, brassaia, caladium, Chinese evergreen, dieffenbachia, echeveria, nephthytis, peperomia, philodendron, pilea, pothos, zygocactus

Container and Bedgrown, Herbaceous: African violet, begonia, calceolaria, carnation, chrysanthemum, Easter lily, geranium, gerbera, gypsophila, orchid, sinningia

Container and Bedgrown, Woody: camellia, poinsettia, rhododendron

Comments: Note that rates vary with the soil volume. Foliage must be rinsed off with water immediately after application to avoid phytotoxicity. Drench application is preferable to soil mix incorporation.

etridiazole +

*Banrot 8G

58185-23

12

 thiophanate-methyl

*Banrot 40W

58185-10

12

Bedding Plants: ageratum, ajuga, alyssum, aster, balsam, begonia, carnation, celosia, coleus, dahlia, dusty miller, gynura, impatiens, larkspur, marigold, nasturtium, pansy, petunia, phlox, salvia, snapdragon, verbena, zinnia

Foliage Plants and Interiorscapes: aglaonema, aralia, cactus, caladium, dieffenbachia, dracaena, epipremnum, fern, ficus, fittonia, hoya, maranta, nautilocalyx, peperomia, philodendron, pilea, schefflera, syngonium, tradescantia

Container and Bedgrown, Herbaceous: African violet, begonia, calendula, carnation, chrysanthemum, coleus, dahlia, delphinium, Easter lily, geranium, gerbera, gloxinia, gynura, gypsophila, ivy, kalanchoe, lobelia, statice, zygocactus

Container and Bedgrown, Woody: aucuba, azalea, camellia, chamaedorea palm, croton, fatsia, ficus, gardenia, hydrangea, pittosporum, podocarpus, poinsettia, rhododendron

Comments: Mix with soil, broadcast, or sidedress.

fludioxonil + mefenoxam

Hurricane

100-951

48

Plants: African violet, ageraturm, alyssum, aster, azalea, begonia, caladium, carnation, calendula, celosia, Christmas cactus, chrysanthemum, coleus, cyclament, gerbera daisy, gomphrena, marigold, pansy, petunia, rose, salvia, snapdragon, spathiphyllum, verbena, vinca, zinnia, and other plants: test a small number of plants for phytotoxicity prior to widespread use.

Comments: Stunting and/or chlorosis have been noted with application to impatiens, New Guinea impatiens, pothos, geranium, and Easter lily. Drench treatments qualify for an exception to the 48 hour REI: see label for details.

fosetyl-Al

Aliette 80WDG

432-890

24

Plants: Drench application to plants such as aphelandra, azalea, cissus, dieffenbachia, philodendron, pittosporum, rhododendron, schefflera, spathiphyllum. Foliar treatment to plants such as aglaonema, aphelandra, azalea, begonia, bougainvillea, cattelya skinneri, cissus, dieffenbachia, geranium, hibiscus, impatiens, leatherleaf fern, marigold, pansy, petunia, philodendron, pittosporum, pothos, rhododendron, spathiphyllum, vinca, zinnia.

Comments: Systemic protection. Allow foliage to dry before overhead irrigation. May not be compatible with fo-liar fertilizers or with compounds containing metal ions. Do not apply within seven days of any copper application.

mefenoxam

Mefenoxam 2

55146-73-60063

48

Quali-Pro Mefenoxam 2 AQ

70252-11-73220

0

Comments: For use on container-, bed-, and bench-grown ornamental plants as a soil drench or incorporated in soil media. Use is not limited to plants mentioned on the label. Pothos and English ivy are extremely sensitive to mefenoxam: see label for precautions. Some Pythium isolates are insensitive to mefenoxam; in the majority of cases, however, the material is highly effective.

mefenoxam

Subdue MAXX 21.3% MEC

100-796

0

Comments: For use on ornamentals, including bedding plants and flowers. Label cautions growers to conduct tests for safety to plants not mentioned on the label before widespread use. Use Subdue MAXX through irrigation, as a drench, or as a soil surface spray, or incorporate into mix. Note that rates are lower than for Subdue 2E. Rates for Subdue MAXX start as low as 0.13 fl. oz./100 gal. for drench at seeding. Some Pythium isolates are insensitive to mefenoxam; in the majority of cases, however, the material is highly effective.

phosphite

*Alude 45.8%

71962-1-1001

4

Plants: aglaonema, anthurium, aphelandra, azalea, cissus, dieffenbachia, English ivy, hibiscus, peperomia, philodendron, pothos, rhododendron, roses, syngonium, spathiphyllum, and zygocactus as a systemic.

Comments: Acidic material; mixtures with some foliar fertilizers and copper materials may cause phytotoxicity to some plants: test for crop safety before use. Do not apply to plants that are heat or moisture stressed.

phosphite

*KPhite

73806-1

4

Plants: greenhouse and nursery ornamentals.

Comments: Acidic material; mixtures with some foliar fertilizers and copper materials may cause phytotoxicity to some plants: test for crop safety before use. Do not apply at less than 3 day intervals, or to plants under heat or moisture stress. Allow foliage to dry completely after application. Do not apply if foliage will sit wet for more than 4 hrs.

phosphite

Vital 54.5%

42519-24

4

Plants: Ornamentals.

Comments: Systemic action. Acidic material; test for crop safety before use.

propamocarb

Banol TOF 66.5% EC

432-942

24

Plants: African violet, ageratum, alyssum, aster, azalea, browallia, carnation, celosia, chrysanthemum, coleus, dahlia, dusty miller, Easter lily, ferns, geranium, gloxinia, impatiens, lobelia, marigold, pansy, petunia, poinsettia, portulaca, salvia, snapdragon, verbena, violet, vinca

Comments: Application at seeding or transplanting, or bare root dip at potting, as well as drenches to established plants.

pyraclostrobin

*Insignia Fungicide

7969-184

12

Plants: See label for extensive list of tolerant species; test for phytotoxicity on a small sample of plants before widespread use.

Comments: Do not use on impatiens or petunias when in flower. Do not use with organosilicone-based adjuvants. For resistance management, make no more than two sequential applications of *Insignia before alternating with a material with a different mode of action (i.e. do not rotate with *Compass O, †Cygnus, or Heritage).

Trichoderma harzianum (KRL-AG2)

Plant Shield HC 1.15%

68539-4

0

This is a biological fungicide. It may be appleed as a spray at 0.25-0.5 oz/gal for suppression of foliar pathogens, or drenched at 3-5 oz/100 gal for suppression of soil pathogens. Follow all label precautions.

Notes:

* = Restricted-use pesticide; may be purchased and used only by certified applicators.

† = Not for use in Nassau and Suffolk Counties; pesticide labels that indicate “Not for use on Long Island, N.Y.” mean that use if prohibited in Nassau and Suffolk Counties only.