Category: Ailments

VIRUS: Maintaining a Clean Collection

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Procedures recommended: No drip to pass from one plant to another, Use no pot a second time, Flame sterilize wire pot-hangers, Re-use no drainage materials, or stakes, or potting materials, Divide ... Read More

VIRUS: Pollen Transmitted or Not

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago There's no proof that infected plants can be used to produce seedlings free of CMV or ORS. A83-816 Read More

VIRUS: Spread by Tissue Culture

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago 1. make sure a plant is free before meristemming, 2. keep a clean plant separate in an insect-free greenhouse, for tissue culturing, 3. test the free plants regularly, 4. producing of clean protoco... Read More

VIRUS: Tests by Amateurs

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago They can do an adequate job using either the serological or bioassay techniques, but each test is for only one virus out of many. A86-274 Read More

VIRUS: Transmission

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Mechanical, insect and pollen agency, their numbers are uncounted; refer to AH86-11; transmission by pollen does not occur in cymbidiums but has been noted in dendrobiums and phalaenopsis. AH86-12 Read More

LEAF-SPOT: Soft Spots Slowly Cover the Whole Leaf

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago The condition should be treated early with Truban, 1 to 1.5 tpg. thoroughly even to the point of drenching, after removing the blackening leaves; if Truban is unavailable use Lesan (Dexon). A81-688 Read More

WATER, COLD: Splashing on Phalaenopsis Leaves

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Cold water causes leaf (mesophyll) collapse on the upper surface; a slightly sunken, light green pitting which is reproduced on the under surface, leading to the yellowing of the leaf. A75-498 Read More

WATER, COLD: Watering Damage to Orchids

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago There is no damage done using cold water to water plants; commercial growers no longer "temper" the water even when it is as low as 39 deg.F. A71-1021 Read More

FREEZING: Of Popular Genera

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago If plant is not completely frozen it may recover; may take three to five years to flower again. A62-399 Read More

WATER, HARD: Causes Calcium Deposits on Cattleya Leaves

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago The acidification of water from the hose gradually dissolves the deposits; see method described, A69-126; A71-609 Read More