Category: Ailments

LEAVES: Damage

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Leaf damage can be caused., by two things,a. disease or fungus or, b. insect infestation; remains of insects are never found because they leave after doing the damage; Yellow streaks followed by si... Read More

LEAVES: Fungus Treatment

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Spotted and pitted leaves require treatment with a paste made of captan or other fungicide; coat the whole infected area and let the paste dry; wash the bench with captan in water and spray all the... Read More

CYMBIDIUMS: Symptoms of Calcium Deficiency

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Not easy to spot; first sign may be reduced spiking; use dolomite lime; a soluble fertilizer likely provides enough calcium. OD71-278 Read More

LEAVES: Hard Water Deposits

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago It is difficult to remove them, the best bet is to scrub the deposits with lemon juice or a very mild acid solution, and rinse it off after. A82-1259 Read More

LEAVES: Mesophyll Cell Collapse

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago This happens especially in phalaenopsis and is caused by cold water dripping off the roof or from the hose onto the leaves; the scars become visible about six weeks after. F81-14 Read More

LEAVES: New Ones Do Not Open

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago They remain partly closed; try periodic syringing in the morning; there is no definite remedy. A78-226 Read More

CYMBIDIUMS: Symptoms of Nitrogen Deficiency

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Very yellow foliage, less vigorous growth, plant looks stunted. OD71-278 Read More

FUNGICIDES: Recommended

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Captan, Dexon, Dithane, Ferbam, Morton's Soil Drench, Natriphene (Dowicide A), Panogen, Parzate C, Z-78, Zineb, OD67-50Dithio-carbonic acid derivatives: Ferbam; Nabam; Thiram, Zineb, Ziram; also Ca... Read More

LEAVES: On Ascocendas Have Bacterial Leaf Rot

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Bordeaux mixture is not very effective against bacteria, so use Physan at 15 ml. per gal. of water. A74-792 Read More

PESTICIDES: Shelf Life

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago They should be purchased for short-term use; mark the date of purchase on the container; most keep their effectiveness for two or more years if stpred properly; signs of ineffectiveness in dusts an... Read More