Newly Posted Articles

MICROCLIMATES: Variability of Temperatures in a Small Greenhouse

Author is Robert M. [Bert] Hamilton (Compiler), posted over 9 years ago Use several thermometers in addition to a high-low type to check degrees; it is warmest at the top, cooler under bench; (generally); variations occur according to the distance from the heat vents i... Read More

PLASTIC BAG TREATMENT: For Rootless Plants

Author is Robert M. [Bert] Hamilton (Compiler), posted over 9 years ago Put the potted plant in a large enough plastic bag to close off the top, place it under the bench and open it every 12 days to ensure it has not dried out; roots should form and then over a week ro... Read More

APHIDS: Controls

Author is Robert M. [Bert] Hamilton (Compiler), posted over 9 years ago A common aerosol insecticide spray is satisfactory; use Raid and stand back several feet from plants to be most effective; don11 use a commercial insect repellant because they damage buds and flowe... Read More

PSEUDOBULBS: Blackening and Dying

Author is Robert M. [Bert] Hamilton (Compiler), posted over 9 years ago It is probably one of the black rot diseases; try Banrot at 1 ttpg. or Benlate at 1/2 ttpg. plus Truban at 1 ttpg. mixed. A76-403 Read More

ALLOTETRAPLOIDS: Colchicine Converted Cymbidium Tetraploids

Author is Robert M. [Bert] Hamilton (Compiler), posted over 9 years ago Expected to have an impact on orchid breeding greater than meristemming. OA75-213 Read More

PHYTORHTHORA: Black Rot

Author is Robert M. [Bert] Hamilton (Compiler), posted over 9 years ago It may also be caused by Pythium ultimum most destructive on cattleya types; high humidity favors it, so water into the pot and not on the leaves; control it with Truban drench at Hpg. AH86-72 Read More

CYMBIDIUMS: Shading Green Flowers

Author is Robert M. [Bert] Hamilton (Compiler), posted over 9 years ago Shade them shortly after buds are exposed from the sheath; this prevents red pigments forming to cause muddy coloration later. OA75-179 Read More

CHARCOAL: Activated to Adsorb Ethylene

Author is Robert M. [Bert] Hamilton (Compiler), posted over 9 years ago Pulverized charcoal activated by baking for two hours at 400 deg. and then hung in the greenhouse was claimed successful; activated monthly. A76-817; it definitely will not remove it by itself; air... Read More

SOW BUGS: In Fir Bark

Author is Robert M. [Bert] Hamilton (Compiler), posted over 9 years ago Control by dusting the surface of the pot mix with Sevin dust 5%. A82-1061 Read More

HUMIDIFIERS: Portable Unit Develops Fungus Growth

Author is Robert M. [Bert] Hamilton (Compiler), posted over 9 years ago To control this, use Physan 20 one drop in three-quarters of a gallon of water. A78-698 Read More