Author is Robert M. [Bert] Hamilton (Compiler), posted almost 10 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...
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LEAF-SPOT: Cercospora angraeci
Author is Robert M. [Bert] Hamilton (Compiler), posted almost 10 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...
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LEAF TIP BURN: Cercospora odontoglossi
Author is Robert M. [Bert] Hamilton (Compiler), posted almost 10 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...
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LEAF TIP BURN: Septoria selenophomoides
Author is Robert M. [Bert] Hamilton (Compiler), posted almost 10 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...
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LEAF TIP BURN: Cercospora peristeriae
Author is Robert M. [Bert] Hamilton (Compiler), posted almost 10 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
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CROCK: In Pots for Drainage
Author is Robert M. [Bert] Hamilton (Compiler), posted almost 10 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...
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HEATERS: Wood-burning Stoves
Author is Robert M. [Bert] Hamilton (Compiler), posted almost 10 years ago
They are not recommended because they ruin most orchids unless the draft is fully open at all times to discharge fumes into the neighbour's back yard. A81-526
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KELTHANE: On Phalaenopsis Seems to Have Stunted Growth
Author is Robert M. [Bert] Hamilton (Compiler), posted almost 10 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
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AIR MOVEMENT: Improves Growth
Author is Robert M. [Bert] Hamilton (Compiler), posted almost 10 years ago
Properly arranged fans blowing on plants bring good results, because air makes heat, light, humidity, etc., work together. F85-9
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PH (GENERAL): Of Potting Mix
Author is Robert M. [Bert] Hamilton (Compiler), posted almost 10 years ago
Experiments show that if a recommended medium is chosen the initial pH should cause no concern. Hort. revs. 1983-195
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