Newly Posted Articles

LEAF BLIGHT: Also Known as Leaf Die-back, Tip Burn

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Caused by fungus invasion; spreads gradually through leaf; cut it out before treating; infected areas show watery before drying; control with Benlate, or Anti-Damp, or Tersan. RMH Read More

LIGHT, NATURAL: Requirements for Cattleyas

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago An intensity of 2,000 to 3,000fc. is an excellent range; the higher the light the more cooling and ventilation required. A68-56 Read More

CROWDING PLANTS: Do Not Do it

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Air circulation is very important in the growth process. OD72-227 Read More

ALKALOIDS: Contained in Some Phragmipediums

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Analysis of a number of species; for details refer to A81-1346 Read More

ALKALOIDS: Nitrogen-containing Compounds

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Definitions and chemistry; refer to W2-349+; OB1-97+ Read More

LEAVES: On Cattleyas Go Limp and Wrinkled

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Possible injury to roots is the most likely cause; caused either by over-watering or excessive drying. A76-115 Read More

CYMBIDIUMS: In Summer

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Do not keep in a hot enclosed area (in California) in summer; they do better in an airy partially shaded location. OA78-139 Read More

LIGHTS, ELECTRIC: At Night and Their Effect on Plants

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Lighting for 24 hours stimulates some seedlings; it has no advantageous effect on mature plants; most species flower best under short days, from 12 to 14 hours of light and are inhibited by 16 hour... Read More

LIGHT, NATURAL: Requirements for Maximum Light

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago For a review of excess or weak light effects and their results, refer to A67-468+; AH42+ Read More

BRACTS ON SPIKES: But Flower Buds Don't Show There

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Both oncidiums and phalaenopsis require a cool treatment of several weeks to promote flowering. A80-960 Read More