Newly Posted Articles

CYMBIDIUMS: Culture to Induce Spiking

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago "full-sun" treatment can be successful; give as much sun as possible in the summer including risk of sunburn and with more water and fertilizer, OD68-244The day-night temperature change must be 20 ... Read More

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

VARIETIES: Characteristics

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A group of organisms within a species that differs from the other members or groups in one or more minor characteristics but not enough to justify a new specific epithet. ODA72-135A variety is a we... 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

SALTS, FERTILIZER: In Water

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago They burn the root tips where they enter the potting medium m this means there is too much chloride, sodium or bicarbonates on the potting surface. A71-917; A71-1102 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

PUMICE: Definition

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A light, spongy stone thrown up by volcanoes. A75-712; RMH Read More