Category: Ailments

TRISODIUM PHOSPHATE: As a Deactivating Agent

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Frequently used on cutting tools in a saturated solution; the knife must be wiped clean before soaking, change the solution frequently; it does not harm the metal. A84-129 Read More

BACTERIAL BROWN SPOT: Phytomonas Cattleyae

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Attacks cattleyas, and especially phalaenopsis and seedlings; small water-soaked spots; dirty green at first turn brown or black, enlarge rapidly; on phalaenopsis spot is blister-like and spreads r... Read More

VANDAS: Crown Rot

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago During rainy weather in Florida additional protection is advised; deposit a small teaspoonful of Captan in the uppermost leaf axils and the crown; with each watering or rain a deposit of Captan wil... Read More

VANDAS: Leaves Fold in V-shape

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Caused by insufficient water and/or humidity and/or excessive sunlight. F76-85 Read More

PELORIA: In Phalaenopsis

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Use of deformed clones in hybridizing to obtain unusual petal markings or forms; refer to A83-722; F84-180; in cattleyas, refer to F84-235 Read More

BLACK ROT: Phytophora Cactorum

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Leaf and heart rot; cattleyas are the main host; fungus attacks all parts except roots; shows purple, purplish brown or black; leaves often become brittle and can be jarred off; caused by coolness ... Read More

BOTRYTIS CINEREA: A Saprophyte

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Flourishes on decaying leaves, flowers, flower sheaths, leaf axils, organic debris on benches and floors, multiplies under conditions of excessive damp and cold; produces unsightly brown to black s... Read More

BOTRYTIS: Flower Spotting

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Caused by Botrytis cinerea; occurs generally on cymbidiums, but also infects cattleyas and phalaenopsis; cool conditions favor infection (45 to 65 deg, F); clean culture is essential; to date no ch... Read More

VANDAS: No Blooms

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Vanda hybrids with V. sanderiana blood will not bloom if kept too cold, even when located south of Miami; also, relatively strong light is necessary. A71-345 Read More

BUD DROP: In Cymbidiums

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago May be caused by several things: temperature dropping too low when buds are developing; shortage of water while forming or about to emerge; a weakened condition caused by lack of fertilizer, too mu... Read More