Category: Ailments

MEALY BUGS: On Plants Under Lights

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago For control use Cygon 2E, at 2 tpg.; Malathion is better for the home but it needs 1/2 tpg. of wetting agent to be effective. A78-495 Read More

APHIDS: Toxicity of Controls

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago In increasing degree of toxicity to the user: malathion (LD50=2 oz.) dimethoate and lindane (1/2); and too toxic to be recommended was demeton (8 drops). A68-582 Read More

BACTERIAL BROWN ROT: Caused by Erwinia Cypripedii

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Small oval water-soaked spots in paphiopedilum leaves; change from light brown to deep chestnut enlarging steadily; can be suppressed by submerging in Natriphene at 1:2000 for 1 to 2.5 hours. BU49;... Read More

FUNGICIDES: Compatibility of Benlate and Truban

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago They are freely compatible, use lttpg. Ben late and ltpg. Truban. A82-1178 Read More

FUNGICIDES: What Are the Effective Broad-spectrum Brands?

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Use Physan to control bacterial infections, benomyl (Benlate) is better for fungi, but where it fails use Truban or Banrot such as for Pythium; do not use Bordeaux in the greenhouse. A79-674 Read More

FUNGUS GNATS: Moss Flies; Characteristics and Control

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago They lay eggs in pot compost; the larvae break down the compost; the surface clogs; they breed at an alarming rate in the heat; are killed by fumigation or aerosols used in rapid succession to brea... Read More

INSECTICIDES: Not Specifically Recommended for Orchids

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Manufacturers do not try their products on all plants; if recommended for orchids and harm follows a damage suit could arise; Cygon was developed for some other control; it has harmed broughtonias;... Read More

LEAF-SPOT NECROSIS: Control by Various Compost Techniques

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago A build-up of undissolved solutes in water cause the leaves to die at the tip; it also causes punctate areas of necrosis of tender leaves of species such as stanhopeas, pescatoreas, lyxastes, etc.;... Read More

PSEUDOMONAS CATTLEYAE: In Cattleyas

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago A bacterial pathogen; mild effect on old leaves but can be epidemic on cymbidium seedlings; recommend control with Natriphene, Physan, tetracyclines, Polymixin B. OD67-50Its characteristics; its se... Read More

PESTICIDES: Shelf Life

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