RUSTS: Sphenosphora Sp. and Uredo Sp.

Ailments Orchid Doctor

by Robert M. [Bert] Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin almost 8 years ago.

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They are usually orange, brown rusty spots found on many genera; cut it off and burn the pieces of infected leaves, or better still, destroy the whole plant; spray with Ferbam or Zineb; Plantvax-75W may be successful. "AH32+
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RUSTS: Controls Captan and Ferbam are not used with official approval in combatting them, and to those can be added Fore/ Dithane for use on dendrobiums; some of the better ones, not yet legal are Bayleton, Triforine/Funginex and they might be worth looking for. AH86-70 0
RUSTS: Frequently Found in the Wild Some imported plants may carry rust fungi; can be seen as masses of yellow to orange spores; treat with copper containing fungicide, such as Bordeaux mixture or Tersan. A66-558; A73-815; S203; copper sulfate is very toxic to plants. OWD 0
RUSTS: On Leaves of Several Genera Rust disease is caused by a fungus, the appearance of rust on plants may also be caused by unstable iron in the water supply; a specimen leaf should be checked by the Dept. of Agriculture; address given. A73-615 0
RUSTS: Sphenosphora Kevorkianii, Etc. Found on Epid. tampense; small orange areas or pustules under the leaves; they turn black, are sometimes concentric; only the leaves are attacked; cut them off; try Plantvax-75W, or ferbam, or captan. B15; BU15 0
RUSTS: Sphenosphora Mera Attacks various orchids; on cycnoches it is found under the leaves as tiny raised cinnamon brown areas; when ruptured they spread spores; remove and burn plants; or spray with ferbam, or Plantvax 75W at 2% ttpg, monthly. B17; BU18 0
RUSTS: Sphenospora Saphena Some oncidiums in Florida have been infected; show tiny raised orange areas under leaves; aging, the pustules become dark brown; remove and destroy all infected plants; spray surrounding ones with ferbam; spray small plants with Plantvax 75W monthly at 2% ttpg. BU17 0
RUSTS: Uredo Behnickiana, Etc. First seen on Phaius grandifolius; no control once it is established; destroy all infected plants; try Plantvax 75W at 2.5 ttpg.; varying results have been reported with it. B13; BU14+ 0
RUSTS: Uredo Epidendri Infrequently found in Florida on Oncid. cavendishianum; shows raised brown pustules with reddish border, first on the underside of leaves; destroy all plants showing infection; protectively spray other plants with ferbam at 1.5 ttpg weekly or Plantvax 75W at 2.5 ttpg.every thirty days. B16, BU17 0
RUSTS: Uredo Nigropunctata Occurs infrequently in Florida; it forms conspicuous irregular orange and black pustules on both surfaces of the leaves; cut them off and destroy them; try ferbam at 1.5 ttpg. weekly, or Plantvax 75W at 2.5 ttpg. twice, 30 days apart, BU19 0
RUSTS: Uredo Oncidii Many plants are attacked; it produces powdery masses of yellow to yellow-orange spores; spreads easily; weakens plants; treat with a copper-containing fungicide, or Tersan; N319 (as Hemeleia americana); destroy the plant; spray all others with ferbam. BU61 0

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