Category: Ailments

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

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 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

SHEATHS: Dry

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago It is a normal condition with Cattleya mossiae, and its hybrids and some other cattleyas. OD73-2 Read More

FLOWERS OF SULPHUR: As a Fungicide

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Dusting of exposed or cut areas of plants is extremely safe; it was the first insecticide-fungicide. A78-302 Read More

FLOWERS, CRIPPLED: Freaks on Cattleyas

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Normally such changes are associated with genetic causes rather than virus but possibly high temperatures coupled with low humidity can cause a disturbed genetic development. A75-192; N311 Read More

CHEMICAL WEEDING: Possible Injury to Plants

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Susceptibility of young plants or new growths to chemicals is greatest; arrested growth can follow, or dieback; leach well after or repot. A67-566 Read More

SPRINGTAILS (COLLEMBOLIDS): Small, Grey Jumping Insects Found in Pot Medium

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Controls: in increasing degrees of toxicity to the user -- malathion (LD50 of 2oz.), lindane (1/2 oz.) and dimethoate (1/2 oz.). A68-582; drench lightly with Diazinon 25%EC or 50%WP at 1 ttpg. A77-... Read More

BACTERIAL LEAF SPOT: Control

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Basic copper sulfate (a fixed copper fungicide) at 1/2 ttpg. as spray recommended; or, Natriphene 1:2000 as drench. P71(2)24Formaldehyde 10% solution is very effective when applied solely to affect... Read More

LEAVES: Whitish Build-up From Minerals in the Water

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Additive available to dissolve it: use mild detergent to help remove the deposit; an ion-exchange demineralizer is expensive; do not use water softener. A77-314 Read More

THRIPS: Control If Malathion Has Not Been Effective

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago The Malathion used must have been old; use fresh Malathion, spray at 1.5 tpg. every five to seven days, with three applications; or spray with Zectran at 3 tpg. A72-1100 Read More

PESTICIDES: Shelf Life

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 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