Category: Ailments

CRIPPLING OF FLOWERS: In Cattleyas; Causes

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago C. Intermedioflava (C. intermedia x L. flava) produce deformed petals on 50 percent of its flowers on every clone; when crossed with Sophronitis grandiflora the same deformity showed up; is the cri... Read More

CROWN ROT: In Cymbidiums

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago The cause may be 1, too high nitrogen level during cult ivation of the seedlings; use Electric Conductivity reading of not more than 0.6, with a nitrogen to potassium proportion of 1:1:2. 2, Night ... Read More

CROWN ROT: In Phalaenopsis Seedlings

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago A preventive is Benlate as a spray or light drench; 1 ttpg.; A74-300; also, use Natriphene. OR69-272 Read More

IRON: Deficiency

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago In mi Itonlopsis it shows up as either blotchy leaves or as leaf tips faded from loss of green pigment; use a half dose of Sequestrol one day after heavy watering. OIE85My-3 Read More

PENICILLIN THOMII: A Fungus

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Responsible for leaf blotch rot on paphiopedilums; the blotches are 1.5 in. across, rounded or elongated, watery, deep brown, marginated by paler brown; has a predilection for older leaves. OD65-11 Read More

CROWN ROT: Of Paphiopedilums

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago In nature these plants grow in swamps under rain or under constant spray from waterfalls and they don't develop crown rot; but when water is allowed to stand in their crowns under warm temperatures... Read More

CROWN ROT: On Phalaenopsis

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Benlate stopped the rot but did not stop the plant's growth; if leaves are good, active lateral buds likely remain to continue the growth. A75-500; spray with Physan at 1/2 ttpg.; keikis frequently... Read More

CYMBIDIUM MOSAIC VIRUS: Description

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Lesions are always elongated, sometimes streak-like, are often whitish for a month or two before turning brown-grey or black and are usually slightly sunken. A82-37; place cutting tools, etc., in t... Read More

CYMBIDIUM MOSAIC VIRUS: In Cattleyas

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Produces more necrotic symptoms than in cymbidiums; dark brown or black sunken rings or streaks which tend to coalesce darkening the whole leaf; the symptoms generally are more pronounced on the up... Read More

CYMBIDIUM MOSAIC VIRUS: Symptoms and Spread

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Leaf mosaic, chlorosis, streaks or necrotic spots are visual in nature but in many plants no foliage symptoms appear; the number and size of flowers are reduced; there is no color-breaking in cymbi... Read More