Category: Orchid Doctor

RUSTS: Frequently Found in the Wild

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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; copp... Read More

RUSTS: On Leaves of Several Genera

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 ... Read More

RUSTS: Sphenosphora Kevorkianii, Etc.

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 capt... Read More

RUSTS: Sphenosphora Mera

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 7... Read More

RUSTS: Sphenosphora Sp. and Uredo Sp.

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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-75... Read More

RUSTS: Sphenospora Saphena

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 ... Read More

RUSTS: Uredo Behnickiana, Etc.

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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+ Read More

RUSTS: Uredo Epidendri

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 o... Read More

RUSTS: Uredo Nigropunctata

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 7... Read More

RUSTS: Uredo Oncidii

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 americ... Read More