Category: Ailments

THRIPS: A Common Pest on Vandas

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Inside the bud, thrips are protected from insecticides, so it is a good idea to spray early; if late use a fine spray or a misting to avoid injury; use Sevin SOW; if flowers are open use Black Leaf... Read More

TOBACCO MOSAIC VIRUS: Orchid, or 0 Type

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago In cattleyas and phalenopsis it can exist without symptoms, or with a slight yellowing or streaking of the leaves; no symptoms in the flowers; in combination with other virus it causes blossom brow... Read More

TOBACCO: Smoking

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Smoke from a cigarette cannot transmit virus, the question is whether contact of the hand to cigarette tobacco then back to plant transmits live virus. A67-234 Read More

TOBACCO: Smoking in the Greenhouse

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Avoid discarding cigarette butts because they carry Tobacco Mosaic Virus which infects orchids. OD67-50 Read More

THRIPS: Controls, in Increasing Degrees of Toxicity to the User

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Malathion (LD50=2oz.), lindane (1/2 oz.) and dimethoate (1/2 oz.) A68-582 Read More

CYMBIDIUMS: Bud Drop

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago During hot weather buds drop if the plant has an ancestor C. lowianum 'concolor' which has as its progeny C. Alexanderi 'Westonbirt'. OA86-82 Read More

TRISODIUM (ORTHO) PHOSPHATE: For Virus Control

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago A one-minute soak in it inactivated Cymbidium Mosaic Virus; a ten-minutes soak did not completely inactivate Odontoglossum ring-spot virus. P68(4)-5 Read More

TRISODIUM PHOSPHATE: Disinfectant

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Sometimes written as Trisodium (Ortho) Phosphate; a saturated solution it has a pH of 12 which seems effective for cleaning tools. A86-34 Read More

TRISODIUM PHOSPHATE: For Virus Control

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago A saturated solution will denature viral particles with a 10-minute soak; rust is not checked. A87-132 Read More

VANDAS: Lack Roots Up-stem for Repotting

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Air-layer the stems to induce rooting by wrapping some places on the stem with moist sphagnum wrapped with polyethylene secured top and bottom with string or elastic, until new roots are large enou... Read More