Category: Ailments

PHALAENOPSIS: Leaves Fall Off

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago All evergreen plants lose leaves and it's not a problem if there is a constant, or increasing number per plant. A84-286 Read More

NECROTIC SPOTS: On Phalaenopsis, Mature Plants; What Treatment?

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago It is possibly Pseudomonas cattleyae, a bacterial disease; remove the leaves and spray monthly with Physan 20. A79-455 Read More

ROOT ROT: Pellicularia Filamentosa

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A fungus, causes brown rot; can kill small seedlings rapidly; a brown mycelium infects the roots and other parts; soak in Natriphene at 1:2,000, or treat with Zineb or Tersan; repot clean. N317; us... Read More

RING SPOT: On Odontoglossums

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A virus disease caused by Tobacco Mosaic Virus -- Orchid Strain, one of the two viruses common in orchids; Odontoglossum ring-spot virus is the same thing. A73-818 Read More

RING SPOT: Virus

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Shows up on leaves of Dendrobium antennatum but produces no floral abnormalities; a bacilliform virus. A74-529 Read More

BUDS: Not Opening Fully

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Phalaenopsis amabilis: suspected cause is abnormally low humidity; try syringing buds to dissolve nectar. A77-702 Read More

ISOTOX: Insecticide

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A systemic for mealybug reformulated about 1982; use with caution. A82-159 Read More

CYGON 2E: As a Regular Spray

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Use 3 tpg spray when temperature is below 70 Deg F. for control of scale and mealybug. A82-690 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

PESTICIDES: Shelf Life

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago They should be purchased for short-term use; mark the date of purchase on the container; most keep their effectiveness for two or more years if stpred properly; signs of ineffectiveness in dusts an... Read More