Category: Orchid Doctor

PUMICE: As a Cymbidium Medium

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 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

PUMICE: As Potting Media

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago For its characteristics, a clinical analysis, comparative data with fir bark and osmunda, its many advantages, refer to A61-17+; C72-70+ Read More

PUMICE: Definition

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A light, spongy stone thrown up by volcanoes. A75-712; RMH Read More

PUNGA: Plant Mounts

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A native material; slabs of it can be very acidic, so it is best soaked well in water with dolomite lime at the rate of 2 ttpg. NZ87-112 Read More

PVC PANELS: For Greenhouse Covering

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago They are used satisfactorily but they do not last as well as acrilic materials. A68-331 Read More

PYRETHRINS: Extract of Chrysanthemums

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Its toxicity reactions in humans: local anesthesia, intestinal distress, headache, ringing in the ears, etc; A68-583; LD-50 is 1,500; relatively safe. OWD Read More

PYRETHRUM: A Safe Insecticide

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A powder, it can be used in the home, is available as an aerosol spray to be used on flowers on indoor plants; is harmless to bees, but kills ants, aphids, thrips, caterpillars, white fly; it usual... Read More

PYTHIUM BLACK ROT: And Damp-off

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Caused by Pythium ultimum; it requires free water in order to spread; community pots are most vulnerable; on older plants black spots should be cut out and the plant soaked in Anti-Damp or Natriphe... Read More

PYTHIUM BLACK ROT: On Cattleyas

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Treatment: drench the plant in Truban at one ounce to 25 gals. water, or 1 level teaspoon in 3 gals. water. A74-34 see also Black rot; Dry rot; Leaf blight; Leaf tip blackening; Pythium ultimum Read More

PYTHIUM ULTIMUM: A Fungus

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Also know as slime mold; it favors moist, cold conditions; in one phase it swims on a thin film of moisture; can be spread by splashing water; causes soft brown rot. OD65-10; OD67-49; controls: Tru... Read More