Category: Ailments

LEAVES, PLEATED: On An Oncidium Plant

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago If new leads produce short, split, pleated leaves it is possibly because of a salt problem in the pot; change to plastic pots; under-watering is another partial possibility. A80-254 Read More

LEAVES, PLEATED: On Plants Generally

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago It is sometimes caused by low humidity. A70-798; A78-112 Read More

RATS: In a Cymbidium Shade House

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago They attacked the new growths especially, but a few whole plants were eaten. OA84-49 Read More

LEAF-SPOT: Cercospora dendrobii, C. epipactis, C. peristeriae Plus Six Other Cercospora Sp.

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Usually shows as yellowish or brown spots on underside of leaves; sometimes join together to form larger spots; all are controlled by spraying with Benlate at 1 ttpg. with a wetting agent, and repe... Read More

LEAVES, PLEATED: On Calanthe, Lycaste and Phaius Plants

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Add extra humidity by syringing early in the day; the "pleating" on these is normal and not across the veins. A67-139 Read More

ALGAE: Control in Cattleya House

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Physan 20 may be too expensive; Phygon is cheaper for use on evaporative cooling pads. A74-969 Read More

ALGAE: Control in Growing Trays

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago After watering plants, rinse the tray grave1 if possible and allow grave 1 to dry fully to kill algae; repeat periodically; or, spray grave 1 with Simazine 80W, 1 tpq. A70-535 Read More

ALGAE: Control on Surface of Potting Medium

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Use 1.5 ttpg. of Maneb (Manzate) as heavy spray. A73-409 Read More

ALGAE: Controls

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago When it occurs in a humidity tray holding water and pebbles, pour in a little chlorine (household bleach), let it remain for a while then decant and ventilate; or, use neutral copper. A86-929 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