Category: Ailments

LADY BUGS: For Aphid Control

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago They can't control an infestation. A74-708 Read More

LEAVES: Removal From Ailing Plant

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Most important is the removal of most leaves from a dessicated plant recently received with no roots; when little or no means to replenish water exists the plant should be relieved of a good portio... Read More

MALATHION: Effectiveness on Spider Mites Questioned

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago The residual action is short-lived, but with a wetting agent the spray is effective when used repeatedly to break the mite cycle; other better miticides are available. A76-1007 (see Miticides) Read More

MITES, PHALAENOPSIS: Characteristics and Damage

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Tenuipalpas pacificus causes purplish discoloration to the bottom of leaves; the green fades and yellowing occurs; or first indication can be deep pits or sunken areas and slight olive-colored or r... Read More

PHALAENOPSIS: Leaf Crinkling

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Causes include genetics, mechanical problems, or lack of water; check the roots, if they are dry and blunt-tipped you have a problem with soluble salts and if so, cut off the spike flush with the t... Read More

PHALAENOPSIS: Leaf Pitting and Collapse

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago It can be induced by exposure to cold temperatures of 35 to 45 dF (2 to 7 dC), the amount depends on length of exposure and the age of the leaves, old ones being less susceptible; mesophyll leaf co... Read More

PHALAENOPSIS: Stems Bending or Breaking

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago This could happen when the plants are grown too lushly, or in extremely low light,or with too high levels of nitrogen. F82-55 Read More

QUILLING: Of Leaves of Dendrobiums

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago D.phalaenopsis hybrids show lack of unfolding of the leaves; low humidity is thought to be a cause; leaves may be bound by dry, hard nectar; cause not really known; syringing may be beneficial. A80-4 Read More

PHYSAN 20: Deterioration on Standing

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago It loses its effectiveness by repeated use but the solution may not deteriorate just on standing. A76-14 Read More

PHYSAN 20: Harmful to Some Plants

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago It has harmed roots of paphiopedilum at one-quarter strength solution when plants were dipped at repotting. A78-302 Read More