Newly Posted Articles

ELECTRIC CONDUCTIVITY: Meaning

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago The measure of current flow (of fertilizer) passing through water, determined by a reading on a meter connected to the water line; similar to the concept of Parts Per Million. OA87-163; 200 Read More

ELEVATION: And Habitat Preference

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago For a chart of 125 angraecoids from 7,000 feet to sea level, refer to Hillerman's Cultural manual for Angraecoid orchid growers (1983) 25. Read More

PESTICIDES: For Home Use

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Use fungus control materials not essentially dangerous but designed to eliminate insects, such as Malathion, Kelthane, Diazinon and Pentac, all safe to use but be sure to ventilate the premises, mi... Read More

PESTICIDES: Frequency of Spraying

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Depends on the product: Benlate can be applied every two weeks until the fungus is controlled in two or three applications; pesticides generally can be applied every three or four weeks until contr... Read More

EMULSIFIABLE CONCENTRATES (EC): Pesticides

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago An oil based solvent is the carrier with an emulsifier so oil and pesticide will mix with water; they adhere to foliage well and provide longer residual action but are more phytotoxic than powders.... Read More

ERWINIAS: Rot in Paphiopedilums

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago E. cypripedii and E. carotovora are most troublesome; they cause soft, brown dead areas near the base; remove whole leaf immediately; treat wound with fungicide, dry sulfur powder, or Difolitan4 fl... Read More

ETHYLENE: How to Detect in a Greenhouse

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Opening buds of white cattleyas will bleach to green or cream; lavender flowers to pink; if concentration is low only the tips of sepals will be affected; there is no simple chemical test for it. A... Read More

FAN-JET SYSTEM: For Ventilation and Heating

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A fan at the end of the greenhouse is attached within a long tube of polyethylene punched with holes every two feet; heated air from the furnace or fresh air from outside is circulated. A67-383+; A... Read More

FANS: Proof of Their Efficacy

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago It has been proven under .many conditions; so, how did the Victorians get by without them? A81-810 Read More

FANS: When to Run, When to Shut Off?

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Run them 24 hours usually; they are needed most at night. A70-798 Read More