Newly Posted Articles

VAPOR BARRIERS: Paints to Apply to Concrete Blocks

Author is Robert M. [Bert] Hamilton (Compiler), posted over 9 years ago They are asphalt-based and rubber-based and are satisfactory, but damp walls in a greenhouse are beneficial in maintaining humidity so why use them? A66-927 Read More

CYMBIDIUMS: 6n Polyploids

Author is Robert M. [Bert] Hamilton (Compiler), posted over 9 years ago New development with potential is the use of 6n crossed with diploids (2n) to produce tetraploids (4n); 6n plants were produced by treating triploids (3n) with colchicine; desirable features of 2n ... Read More

CYMBIDIUMS: Analysis of Hybridization

Author is Robert M. [Bert] Hamilton (Compiler), posted over 9 years ago Percentage composition of species in the lineage provides indication of exhibition quality of the flowers; assumptions of the criteria applied; the norm is 50% C. insigne, 25% C. lowianum, 25% C. e... Read More

PESTICIDES: Chemicals

Author is Robert M. [Bert] Hamilton (Compiler), posted over 9 years ago For a list of those used in plant disease control, with both common and chemical names, their Lethai Dose-50 rating and their use as either systemics, fungicides, disinfectants, bactericides, algic... Read More

PESTICIDES: Classification

Author is Robert M. [Bert] Hamilton (Compiler), posted over 9 years ago Chemical relationships: Organo-phosphates: Parathion, TEPP, Sulfotepp, Dibron, Systox, Metasystox-R, Thimet, Cygon, Diazinon, Ethion, Malathion, Vapona; 2: Chlorinated hydrocarbons: Chlorobenzilate... Read More

PESTICIDES: Compatibility Charts

Author is Robert M. [Bert] Hamilton (Compiler), posted over 9 years ago Charts of pesticides that can be mixed before applying have been published; two addresses given; Kelthane and Malathion are compatible. A69-793 Read More

PROPORTIONERS, FERTILIZER: To Achieve Relative Accuracy by Means of Cheap Instrumentation

Author is Robert M. [Bert] Hamilton (Compiler), posted over 9 years ago Make your own economical flowmaster with materials purchased from a tropical fish store; refer to OD73-57 Read More

CYMBIDIUMS: Bud Appearance

Author is Robert M. [Bert] Hamilton (Compiler), posted over 9 years ago Liquid insect sprays applied when buds are appearing may cause them to distort and malform. OD70-239 Read More

FOOT-CANDLES READING: Using a Built-in Light Meter in a Camera

Author is Robert M. [Bert] Hamilton (Compiler), posted over 9 years ago Set the speed dial at ASA25 and the shutter speed at 1/60; aim camera at center of sheet of paper eight inches by eleven, eight inches distant; the lens opening (f-stop) is adjusted until the meter... Read More

FOOT-CANDLES: Requirements for Main Types

Author is Robert M. [Bert] Hamilton (Compiler), posted over 9 years ago Cattleyas/laelias 3,000-3,500; cymbidiums 3,000; dendrobiums 3,000-3,500; odontoglossums 2,000+; oncidiums 2,500+; paphiopedilums 800-1,300; phalaenopsis 1,500-2,000; vandas and allied 3,500-4,000.... Read More