Category: Orchid Doctor

LEAF EXPLANTS: A Type of Clonal Propagation

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago For the methods to follow with the materials recommended, in order to produce Renantanda plantlets from leaf bits,refer to OR82-295 Read More

LEAF FALL: As An Indicator

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago It is no cause for concern as most plants shed leaves sooner or later in the natural course of events. A84-584It is usually natural; leaves fall from bulbs three or four years old; may be a cultura... Read More

LEAF GROOMING: Washing Leaves

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Use a solution of one cup of milk to one quart of water; wash both tops and bottoms. A65-403 Read More

LEAF NECROSIS: Cymbidium Mosaic Virus

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago The initial infection is conspicuous; kills some leaves, afterwards milder symptoms show; plant becomes a reservoir of infection; brown sunken pits on underside of leaves; black and chlorotic alter... Read More

LEAF NECROSIS: Severe

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago It is caused by Cymbidium necrotic ringspot virus; deadly but rare; new and old growths are killed; destroy plant. N323 see also Necrotic spots Read More

LEAF ROLLERS: Characteristics and Controls

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago The larvae of Tortricid moths can be destructive; they tie leaves together and feed on terminal growths and bore into the buds and shoots; caterpillars are yellowish or greenish, 1/2 inch long, the... Read More

LEAF ROT: Erwinia and Sp. of Pseudomonas

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Stimulated by warm, damp weather; areas are yellowish or brownish and watery; the bacteria spread quickly; cut off whole leaf; soak the plant in Anti-Damp or Natriphene. A73-815 Read More

LEAF SPOTS: Anthracnose Is a Common Cause

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Small spots occasionally run together; tissue between becomes tan and papery; fruiting bodies show as black dots sometimes as rings; sometimes caused by Circospora sp. (see Leaf-spot) with brown su... Read More

LEAF TIP BLACKENING: On Main Leaflet of Cattleyas

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Caused by Phytophora or Pythium diseases; best controlled by Truban (ethazole) at 1 tpg.; avoid syringing with water at adverse times. A79-1112 Read More

ACID OR ALKALINE: Changing the Values

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Various means can be used: tufa, a limestone form, can be added to paphiopedilums from limestone cliffs; bark composts acidify with age; peatmoss, pine needles, oak leaves in the mix produce acidit... Read More