Category: Ailments

LEAF TIP DIE-BACK: Cause

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago It is caused by high soluble salt content in the water, or by fertilizer salts not flushed out. A70-55; A78-13 Read More

KELTHANE: On Phalaenopsis Seems to Have Stunted Growth

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 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

BUD DROP: In Late Fall and Winter

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Especially noticeable in Dend. phalaenopsis types; it is caused by water stress when heating conditions change suddenly and indoor warmth causes plants to lose moisture faster than the roots can su... Read More

LEAF-SPOT: Cercospora dendrobii

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Infects dendrobiums as light yellow area under leaves; circular enlargement; spots become sunken, purple-black, yellow margined; corresponding yellow-green areas follow on top; spreads to other pla... Read More

LEAF-SPOT: Cercospora dendrobii and Others

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Control is a spray with benomyl or Benlate 20 at 1 ttpg. AH86-76 Read More

ALCOHOL, RUBBING: Pesticide

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago For aphids, mealybugs, scales, etc., can be spot sprayed from an old sprayer, such as for window-cleaner; it dries quickly, penetrates to the eggs. OIE86Sept-15 Read More

LEAF-SPOT: Cercospora epipactidis

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago On Phaius grandifolius, etc.; tiny sunken, yellow spots under leaves, later on top also; enlarge in a few days and become sunken, purple-black; about 1/2 inch or larger; on old lesions center falls... Read More

ALGAE: Control

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Use Physan 20, at the rate of 1/2 tpg. A78-495 Read More

LEAF TIP DIE-BACK: Disorder of Cattleya Types

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Newly matured leaves show darkening of veins very close to the tip, later developing into dark, sunken spots which spread to cover three-quarters of the leaf tip ; most active in summer; many theor... 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