Category: Ailments

LEAF ROLLERS: Characteristics and Controls

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago The larvae of Tortricid moths can be destructive; they tie leaves together and feed on terminal growths and bore into the buds and shoots; caterpillars are yellowish or greenish, 1/2 inch long, the... Read More

LEAF TIP BURN: Cercospora Sp.

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Several fungi attack specifically cattleyas, vandaceous types, oncidiums, cymbidiums, odontoglossums; spray preferably with benomyl 50WP at 1 ttpg. fortnightly, or use ferbam or zineb; use a wettin... Read More

LEAF TIP BURN: Fungus Invasion of Leaf

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Cut out the diseased parts before treating with AntiDamp or Tersan; frequently seen on cymbidiums with pendant leaf-tips which hold drops of water which attract Botrytis; use Benlate. A73-811 Read More

BUD DROP: In Paphiopedilums

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Caused by sudden temperature drop especially in early winter when one sunny day there is a fast heating lip of the greenhouse and as quick a drop at night. OD86-139 Read More

BUD ROT: In Paphiopedilums

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Caused by Erwinia cyprepedii which also commonly attacks base of leaves; watering procedures do not seem to be a factor; strong air movement 24 hours a day controls it partly; drenching plants with... Read More

BUDS: In Sheath on Cattleyas Stopped Growing

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Could be cultural or genetic; no suggestions to offer; if buds are alive remove sheath. A75-1007 Read More

LEAVES: Yellowing of Premature Growth

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Can be caused by improper feeding, or drying, or low temperature, or poor aeration in the pot. A79-910 Read More

DIAZINON: Characteristics

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Organophosphorous compound effective against false spider mites, aphids, thrips, mealybugs, scale insects, cockroaches, springtails, fungus gnats, sowbugs and millipedes; suppresses spider mites, n... Read More

ALGAE: To Prevent Growth in Tanks

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Drain the tank; add Clorox 1 ttpg. and let stand one and a half hours; drain, replace with clear water. A65-53 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