Newly Posted Articles

PSEUDOBULBS: Formation

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Short very fat ones on cattleyas are possibly genetic in origin; it may be caused by a deficiency of boron; make 1 tpg. of Boric acid and put 2 ttpg. of this in each gal. of fertilizer solution and... Read More

PSEUDOBULBS: Mature

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago What constitutes maturity: it is when neither bulb or leaf is expanding, when roots are active, or inactive, but healthy during their rest period; ripe; fully made up. A70-535; OR78-177 Read More

PROPAGATION: Phalaenopsis Stems

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago A detailed description of the method is given; refer to A61-808+; the success rate was 10 to 15%; refer also to A65-437Pieces of stems grow large in the flask without producing roots; best recourse... Read More

PSEUDOBULBS: Shrivelling During Rest Period

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Backbulbs may shrivel but those with leaf should not; you do not have to water on a humid cloudbathed tropical mountain.' A70-535 Read More

PSEUDOMONAS CATTLEYAE: Brown Spot

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago It affects cattleyas, phalaenopsis and others; starts as soft, water-soaked lesion, becomes brown or black; advances rapidly; exudate is very infectious; destroy infected parts; spray with Physan a... Read More

PSEUDOMONAS CATTLEYAE: Common in Phalaenopsis

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago The diseased part should be cut out with a clean razor blade; tap the contents of a Chloromycetin 250 mg. capsule (available from veterinarians) across the cut. OD87-156 Read More

PUMICE: As a Cymbidium Medium

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago It is not considered as good as bark; in an experimental growth trial lasting three years the plants in pumice became smaller, the root system poorer than those in bark, with the root system showin... Read More

QUILLING: New Leaves Stay Rolled and Upright

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Appears on vigorous dendrobiums, both evergreen type and D.phalaenopsis type; may be due to low humidity; the leaves do not look right but they function well. A79-1022 Read More

RAZOR BLADES: For Cutting Plant Tissue

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago To avoid spreading virus, use one blade then throw it away; buy them in boxes of 100 at a paint supply store; if you are reluctant to junk them, put them in the oven for a bake for some hours te st... Read More

RECIPROCAL CROSSES: Different Results

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago The pod parent produces di fferences because cellular location of the genes in three plant structures, the chromosomes, the mitochondrion and the plas tid, all complex features which are inherited ... Read More