Newly Posted Articles

OZONE: Pollutant Causes Crop Damage

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago In California, and in Ontario, damage caused to field crops is large; a yellow-brown photo-chemical smog produced mostly by car emissions; presumably origin of ethylene which is most harmful to cer... Read More

PAINTS: Kinds to Avoid in the Greenhouse

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Those with a mercury or copper base should not be used because of their possible harmful effect. A87-53 Read More

JEYES FLUID: Disinfectant

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Registered for soil conditioning in the U.K. it is used as a spray against such orchid pests as black spot, red spider mite; is useful for eliminating slugs and snails; has been tested on cymbidium... Read More

BROWN SPOTS: Bacterial Disease

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Pseudomonas cattleyae; affects many genera; starts as soft water-soaked lesion becomes brown or black; advances rapidly; kills seedlings; occurs on leaves of older plants; spreads to growing point;... Read More

ROOT TIPS: Blacken or Recede on Cattleyas Before Growing Again

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago A condition usually due to excess salts, especially sodium in the water, or by excessively strong fertilizer solution. A70-345 Read More

PROPORTIONERS, FERTILIZER: The Syphonex Type

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago It is installed on the tap in front of the hose connection; it works well at a low-flow rate of water but the rate can vary from one to 12 to one to 20, depending on the resistance created by the l... Read More

HEATERS: Wood-burning Stoves

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago They are not recommended because they ruin most orchids unless the draft is fully open at all times to discharge fumes into the neighbour's back yard. A81-526 Read More

DENDROBIUM PHALAENOPSIS: How to Get Them to Bloom

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Grow warm and humid until Labor Day then move them to the cymbidium house, slightly reduce watering until Christmas when growths are complete; return to warm house for flowering in about 60 days. O... Read More

PHYSAN: Not Registered for Use on Orchids

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Its use could be authorized by the U.S. Dept. of Agriculture; it requires sufficient pressure brought to bear through petition. A86-915 Read More

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