Category: Orchid Doctor

PLASTICS: For Greenhouses

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago There are no standards for construction or quality and no specifications; clear is suggested for orchids, or, also known as colorless, with ultra-violet resistance. A75-298 Read More

PLASTICS: Toxic to Plants

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Non-orchid plant seedlings have been killed in new glass houses by a plasticizer called dibutyl phthlate (DBP) but not by a related product called didecyl phthlate; DBP occurs in some PVC pipe used... Read More

PLASTICS: Toxic When Burned

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A hot soldering iron when used to burn holes in plastic pots for more drainage, causes hydrogen chloride gas to be released, which is extremly toxic to both man and plant. OIE87Nov-10 Read More

PLEIONES: Cultural Requirements

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Provide bright light short of sun scorch; 55 to 60 deg.F. recommended for night temperatures; water freely until the fall growth slows down; the leaves fall when growth is complete; reduce watering... Read More

PLEIONES: Leaves with Black Lesions

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago These are caused by too little water at the early stage of development. RMH Read More

PLEIONES: Starting

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Place them in an appropriate mix, not more than 1/4 of their depth down in early spring, mist them lightly and infrequently; do not water them until their roots have entered the compost; water will... Read More

PLEIONES: Treatment of Bulbs

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago To carry them over winter: syringe or water them only enough to avoid excessive shrivelling; keep them at 45 to 50 deg.F. when dormant. A71-783 Read More

PLEIONES: Watering

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Too little water at the early stages of growth causes brown or black tipping of the shoots; too much watering causes browning at the stem near the pseudobulb which spreads rapidly and kills the pla... Read More

PLOIDY: A Basic Genetic Concept Dealing with Chromosome Number Levels

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Reproductive egg and sperm carry a haploid set of chromosomes; when hybridized they become diploid (2n) or triploid (3n) or tetraploid (4n) pentaploid (5n),etc; more than 2n are called polyploids. ... Read More

PLOIDY: A Simple Explanation

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Better known as polyploidy, which see; an explanation of mitosis (prophase, metaphase, anaphase and telophase); chromosomes numbers (pioidy); for details refer to AU87(4)-47 Read More