Newly Posted Articles

VIRUS IN PLANTS NAMED: In Cattleyas

Author is Robert M. [Bert] Hamilton (Compiler), posted over 8 years ago Descriptions of severe color break; mild flower break; symetrical flower break; blossom brown necrotic streak; leaf necrosis; severe leaf necrosis; cymbidium mosaic virus; cymbidium necrotic ring-s... Read More

COOL-GROWING PLANTS: For Coastal California

Author is Robert M. [Bert] Hamilton (Compiler), posted over 8 years ago List of 16 genera and 43 species recommended as suitable, with comments; refer to OD70-269 Read More

VIRUS TRANSMISSION: By Insects

Author is Robert M. [Bert] Hamilton (Compiler), posted over 8 years ago Sap sucking insects such as aphids, leaf hoppers (vector of Cattleya Mosaic); slugs, snails, red spider are carriers. OD78-95There is no evidence of transmission of virus on plants left outdoors; m... Read More

VIRUS: Riboviren, a New Viruscide

Author is Robert M. [Bert] Hamilton (Compiler), posted over 8 years ago A complex drug, very expensive to make, has freed cymbidiums from TMV in the lab. OA83-74 Read More

VIRUS - DETECTION, IDENTIFICATION, SYMPTOMS, TESTING: Other Plants Used as Detectors

Author is Robert M. [Bert] Hamilton (Compiler), posted over 8 years ago Cassia occidentalis is an indicator of Cymbidium Mosaic Virus; Gomphrena globosa, for Tobacco Mosaic Virus. A67-287; A68-431 Read More

VIRUS - DETECTION, IDENTIFICATION, SYMPTOMS, TESTING: Spots and Their Meaning

Author is Robert M. [Bert] Hamilton (Compiler), posted over 8 years ago Usually light-colored at first, they become elongated lengthwise, then somewhat depressed, later they darken, become necrotic and more depressed; one form on cattleyas produces a ring formation. A7... Read More

VIRUS - DETECTION, IDENTIFICATION, SYMPTOMS, TESTING: Testing by Commercial Laboratory

Author is Robert M. [Bert] Hamilton (Compiler), posted over 8 years ago Send a leaf or leaves with some visible symptoms, even the expert relies on them; the lower portion of maturing leaves can be sent to Florida West Coast Scientific Labs., address given above on thi... Read More

VIRUS IN PLANTS NAMED: In Paphiopedilums

Author is Robert M. [Bert] Hamilton (Compiler), posted over 8 years ago The signs vary; sometimes the whitish spots and streaks are elongated, sometimes relatively broad and whitish; Ref. A76-206. Please omit. Insofar as determined they are free of virus. OWD Read More

VIRUS TRANSMISSION: Virus Transmission by Seed-pod

Author is Robert M. [Bert] Hamilton (Compiler), posted over 8 years ago Virus disease can be transmitted by green-pod culture although the seed can be removed from the pod uncontaminated; the seeds are virus-free. A75-680 Read More

VIRUS: Controls

Author is Robert M. [Bert] Hamilton (Compiler), posted over 8 years ago 1.discard infected plants, 2. sterilize cutting instruments, 3. sterilize pots, 4. keep moisture from dropping on pots below and do not let roots from plants intertwine, 5.sterilize benches before ... Read More