Category: Orchid Doctor

LEAF TIP BURN: Cercospora peristeriae

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Yellowish to pale brown, oval to elongate spots appear on the under surfaces; move to the top; spray with benomyl 50WP, at 1 tpg. fortnightly to check infection. B20; BU20 Read More

LEAF TIP BURN: Cercospora Sp.

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Several fungi attack specifically cattleyas, vandaceous types, oncidiums, cymbidiums, odontoglossums; spray preferably with benomyl 50WP at 1 ttpg. fortnightly, or use ferbam or zineb; use a wettin... Read More

LEAF TIP BURN: Diplodia laeliocattleyae

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Sometimes found on cattleyas in Florida; small, yellow areas on top or bottom of leaf turn brown and become black, greasy areas; fruiting structures develop on older leaves; destroy all leaves; tre... Read More

LEAF TIP BURN: Fungus Invasion of Leaf

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Cut out the diseased parts before treating with AntiDamp or Tersan; frequently seen on cymbidiums with pendant leaf-tips which hold drops of water which attract Botrytis; use Benlate. A73-811 Read More

LEAF TIP BURN: Phyllostictina pyrjformis

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Leaf-spotting fungus infrequent in Florida and not destructive but makes plants unsightly; tiny, slightly yellow spot, sunken, becomes larger, tan to dark brown; red to purple-black margin; round s... Read More

LEAF TIP BURN: Septoria selenophomoides

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Fungus found on many imported genera; tiny sunken yellow lesions on top or bottom surface; enlarge and become dark brown or black; spots sometimes coalesce; on older plants and fallen leaves fruiti... Read More

LEAF TIP DIE-BACK: Cause

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago It is caused by high soluble salt content in the water, or by fertilizer salts not flushed out. A70-55; A78-13 Read More

LEAF TIP DIE-BACK: Disorder of Cattleya Types

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Newly matured leaves show darkening of veins very close to the tip, later developing into dark, sunken spots which spread to cover three-quarters of the leaf tip ; most active in summer; many theor... Read More

LEAF-SPOT NECROSIS: Control by Various Compost Techniques

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A build-up of undissolved solutes in water cause the leaves to die at the tip; it also causes punctate areas of necrosis of tender leaves of species such as stanhopeas, pescatoreas, lyxastes, etc.;... 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