Newly Posted Articles

PH (GENERAL): Of Potting Mix

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Experiments show that if a recommended medium is chosen the initial pH should cause no concern. Hort. revs. 1983-195 Read More

BARK, PINE: Potting Medium

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago A good common denominator bark for most pot- ting in spite of adverse publicity; does not contain turpentine or some other noxious ingredients. A87-1039It has been used, but is not as popular as fi... Read More

CARBON DIOXIDE: Addition to Greenhouse Atmosphere

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago The natural slow growth of orchids equates with adequate consumption without the necessity of adding it to the atmosphere, but opinions differ. A65-388+; A65-899+ (in favor of adding it); A67-811; ... Read More

LEAF-SPOT: Cercospora dendrobii

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Infects dendrobiums as light yellow area under leaves; circular enlargement; spots become sunken, purple-black, yellow margined; corresponding yellow-green areas follow on top; spreads to other pla... Read More

HEATERS: Wood-burning Stove

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago It is apt to emit too much ethylene if it is not properly vented; burning wood is one of the worst sources of ethylene; it is now a crime to burn wood for heating purposes in London. A81-1436 Read More

ALCOHOL, RUBBING: Pesticide

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago For aphids, mealybugs, scales, etc., can be spot sprayed from an old sprayer, such as for window-cleaner; it dries quickly, penetrates to the eggs. OIE86Sept-15 Read More

LEAF-SPOT: Cercospora epipactidis

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago On Phaius grandifolius, etc.; tiny sunken, yellow spots under leaves, later on top also; enlarge in a few days and become sunken, purple-black; about 1/2 inch or larger; on old lesions center falls... Read More

ALGAE: Control

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Use Physan 20, at the rate of 1/2 tpg. A78-495 Read More

LAELIAS: Cold-tolerant Hybrids

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Not all of them are cold-tolerant, as for out-of-doors conditions but many species can be grown with cymbidiums, above all the favorite L. anceps; for details and names refer to OA82-134 Read More

BARK, REDWOOD: Potting Medium

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Shredded bark used as insulation material and sold as Palco Wool was treated with fire-retardant ammonium phosphate which caused remarkable growth of plants. A87-1041 Read More