Newly Posted Articles

LEAVES: On Cattleyas Become Yellowed

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago If some have black splotches it may be caused by excessive soluble salts, or by toxic salts. A78-495 Read More

LEAVES: On Cattleyas Go Limp

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Too much nitrogen fertilizer, with too low light supply can cause it; poor root condition, such as too wet may be the fault. A72-686 Read More

LEAVES: On Cattleyas Stay Long and Narrow

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago If they fail to spread open it is possibly because they lack sufficient light. A77-995 Read More

LEAVES: On Cattleyas, Have Purplish Spots

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Many pigments are masked until a cultural change takes place; higher light levels turn leaves purple; also, a nutrient deficiency can cause the color to appear; the areas around insect punctures tu... Read More

LEAF-SPOT: Phyllosticta pyriformis

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago It is infrequent in Florida; it blemishes the leaves; starts as tiny slightly yellow spots, sunken, which enlarge and turn tan to dark brown or red with black margins; control with benomyl (Benlate... Read More

STERILIZATION: Tools

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago With Clorox: use one part Clorox to four parts water. A73-615; use one part Clorox to nine parts water. A79-910; Clorox kills in five to ten minutes. A79-1258; A80-110With flame: a candle flame is ... Read More

GREENHOUSES: Warm Growing

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A discussion of location, size, shape, energy conservation, air movement, heating, automation, in New Zealand, refer to NZ86-82 Read More

LEAF-SPOT: Septoria selenophomoides

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Usually found on imported plants; starts as tiny yellow lesions, enlarges and turns dark, the spots coalesce; leaves soon fall and promote more infective spores; spray with benomyl (Benlate 50W) at... Read More

LEAF TIP BURN: Diplodia laeliocattleyae

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Sometimes found on cattleyas in Florida; small, yellow areas on top or bottom of leaf turn brown and become black, greasy areas; fruiting structures develop on older leaves; destroy all leaves; tre... Read More

SEEDS: Germination

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Their metabolism and need for fungal symbionts; suitablity of sugars and other carbohydrates; other data; refer to W10-263 Read More