Category: Ailments

BACTERIAL INFECTION: Phalaenopsis Leaves Yellowed, Shrivelled a Bit and Fell Off

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago If phalaenopsis are grown too cold they are susceptible to bacterial infections; keep night temperatures at 66 to 68 degrees F. A69-242 Read More

RUSTS: Controls

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

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: 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

BACTERIAL LEAF ROT: Erwinia Chrysanthemi a Bacillus

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago In Hawaii; leaf rot in various orchids; water-soaked and yellow spots; preventive spray of Natriphene before wet weather and during recommended. N321 Read More

PESTICIDES: Shelf Life

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago They should be purchased for short-term use; mark the date of purchase on the container; most keep their effectiveness for two or more years if stpred properly; signs of ineffectiveness in dusts an... Read More