The Orchid Doctor Articles under the Heading Mold, Snow

Mold, Snow Comments
MOLD, SNOW: Characteristics and Controls It grows in the potting media and envelopes the roots so they are cut off from water and air; repot the plant, destroy all mold and media; immerse the bottom half of the plant in Physan l.5 tpg.; repeat if necessary. AH86-90 0
MOLD, SNOW: Fungicide as Control Use Physan 20 at 1.5 tpg.; like Shield it is a combination of quarternary ammonium chlorides; so is Roccal. A75-781; A77-702; wash plant in Shield, one ounce to one gal. water and repot..in clean medium. S205 0
MOLD, SNOW: In Bark It does not harm the roots except to use the nitrogen which the plant would normally need; it also contributes to compost breakdown; use Maneb but not Benlate. OR82-102 0
MOLD, SNOW: On the Pot Medium Control: drench or dip plant in Shield 10%, at one ounce per four gals, water; or use Physan 20 at 1.5 tpg., maybe more than once at a few days interval. A66-407; A76-895 0
MOLD, SNOW: Phytogaster Sp. Not a parasite but a saprophyte on the growing media;, leads to poor growth; water-repellent fungus prevents roots from getting water and air; white powdery growth on the top of the media indicates the inside of the pot has been invaded; discard old media; immerse roots, rhizomes,etc. in Shield 10% at one oz. to four gals water; repeat if necessary; repot. AH22White powdery growth on media; covers roots and rhizomes; impermeable to water; treat with Shield at one ounce to four gals, water; repot. N319White powdery growth on top of bark or tree fern media; invades whole pot; a saprophyte on the media; suffocates the roots; control: drench with Semesan, ferbam, or Tersan 75 found to be not fully effective; use Shield as a dip or drench at one oz. per four gals, water at two week intervals; or use Physan 20 at X% ttpg. B37; BU37 0
MOLD, SNOW: Vinegar Dip This has been recommended as a way to "discourage" it: one part of cider vinegar is added to 20 parts of water as an acid solution as a drench. Fitch -- All about orchids. (1981)-219 0

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  1. Carol Holdren commented on topic "recently purchased orchid shows unstoppable roots " by David George
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