Newly Posted Articles

COPPER: Effect on Orchids

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago They are sensitive to copper; metal stakes containing copper might be toxic. A61-54They are sensitive to it; metal stakes containing it may be toxic; citrus trees in the tropics sprayed with a copp... Read More

LEAF-SPOT: Cercospora angraeci

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Fungus found in Florida in 1964; tiny tan or light brown spots become dark purple-brown; may occur in a circular pattern or on a whole leaf; spray with benomyl 50WP at 1 ttpg. fortnightly three tim... Read More

LEAF TIP BURN: Cercospora odontoglossi

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago A fungus attacks cattleya seedlings and others; tiny raised spots dark brown in color under the leaves spread to the whole leaf; resembles spider mite injury; best control with benomyl 50% at 1 ttp... Read More

LEAF TIP BURN: Septoria selenophomoides

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

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

CROCK: In Pots for Drainage

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago It is an old-fashioned idea; no longer used by commercial growers; crock harbors snails; instead use shallower cyclamen pots and a bark-peat mix. A70-798While frequently recommended it also provide... Read More

HEATERS: Wood-burning Stove

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago It is apt to emit too much ethylene if it is not properly vented; burning wood is one of the worst sources of ethylene; it is now a crime to burn wood for heating purposes in London. A81-1436 Read More

KELTHANE: On Phalaenopsis Seems to Have Stunted Growth

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago At dosage used for spider mites, 2 or 3 tpg. 18%EC it is not likely to cause stunting; no previous report of such injury. A74-792; OD65-169 Read More

AIR MOVEMENT: Improves Growth

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Properly arranged fans blowing on plants bring good results, because air makes heat, light, humidity, etc., work together. F85-9 Read More

BARK, REDWOOD: Potting Medium

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Shredded bark used as insulation material and sold as Palco Wool was treated with fire-retardant ammonium phosphate which caused remarkable growth of plants. A87-1041 Read More