Category: Orchid Doctor

LEADS: Rough-textured

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Causes: several possible, such as injury forming a corky layer of scales, or cells may develop unevenly in the forming leaf, or a water/temperature relationship problem may cause blisters; none is ... Read More

LEAF BLIGHT: Also Known as Leaf Die-back, Tip Burn

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Caused by fungus invasion; spreads gradually through leaf; cut it out before treating; infected areas show watery before drying; control with Benlate, or Anti-Damp, or Tersan. RMH Read More

LEAF BLIGHT: Pythium Splendens

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A water mold; shows as a round chestnut brown spot often at the edge of the leaf; enlarges rapidly and turns black and the area dries and thins; cut it out; apply Tersan to the whole plant; reduce ... Read More

LEAF BURN: Caused by Sun

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Too much sunlight causes temperatures of leaves to rise above 105 deg.F to 110 deg.F.; depending on air temperature and the leaf aspect to the sun; tops of leaves have less water and burn easier. A... Read More

LEAF COLOR: As Indication of Health

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Phalaenopsis and a few similar genera should have leaves firm, succulent, medium to dark green; others should be like grass touched lightly with the sun, a medium yellow green. A72-118 Read More

LEAF COLOR: Ideal

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Grassgreen is about the right intensity; very dark green indicates too little light; yellow-green possibly too much; plump, hard, upright leaves show the right amount; bent-over, weak, overly succu... Read More

LEAF COLOR: Unusual

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago If the leaves of young cattleya plants are reddish or purplish it only means the light is bright but is not harmful. A81-266 Read More

LEAF CRINKLING: On Dendrobiums

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Caused by inadequate watering. A79-784 Read More

LEAF DIE-BACK: Fungus Disease

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Spreads slowly from the tip through the leaf unless cut off; Glomerella cincta infects the tip and spreads backwards with a marked line between good and diseased tissue; control with Benlate. A73-8... 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