THRIPS: Distinct From Springtails

Ailments Orchid Doctor

by Robert M. [Bert] Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin almost 7 years ago.

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Thrips also can be found in compost, they damage the roots at the conjunction of the new growing tip and the developing velamen, an area rich in sugars; control them with Malathion. OR82-256
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THRIPS: A Common Pest on Vandas Inside the bud, thrips are protected from insecticides, so it is a good idea to spray early; if late use a fine spray or a misting to avoid injury; use Sevin SOW; if flowers are open use Black Leaf 40 which does not damage the flowers. A85-817 0
THRIPS: Characteristics and Controls There are both winged and wingless phases; they scrape the surface tissue of plant parts especially flowers, causing shallow, silvery scars; they are fast moving and hard to see; spray with Malathion. A73-715; N328They are a problem only occasionally; sometimes a problem with cymbidiums in bud stage; they can enter the bud sheath and become protected from insecticides; can cause ovipositor punctures of flowers; control with Diazinon, dimethoate, Malathion and Zectran sprays, or Dithio smokes or Temik granules. AH4They are sometimes airborne on strong air currents; are abundant on weeds and vegetation outdoors; control with frequent applications of weak solutions of insecticides, especially on vandaceous plants. F76-33 0
THRIPS: Control If Malathion Has Not Been Effective The Malathion used must have been old; use fresh Malathion, spray at 1.5 tpg. every five to seven days, with three applications; or spray with Zectran at 3 tpg. A72-1100 0
THRIPS: Controls Spray the young spikes preventively with Sevin 50W (Carbaryl Insecticide) in its wettable powder form; when the flowers open spray with Black Leaf 40 (nicotine sulfate); some growers use Orthene 75 (Soluble powder) at i tpg. F87-87They require persistent effort; control with Malathion, Cygon 2E, Diazinon or a Dithio smoke. A78-909; A64-692; S193; in Florida four types named and five controls given; refer to DK9+ 0
THRIPS: Controls, in Increasing Degrees of Toxicity to the User Malathion (LD50=2oz.), lindane (1/2 oz.) and dimethoate (1/2 oz.) A68-582 0
THRIPS: Insecticide Control for Indoors For a basement collection under lights, use Malathion but if it is not effective, use Diazinon at the rate of 1 tpg.; it may be repeated in 14 days. A81-150 0
THRIPS: On Cymbidiums They are among the worst pests, causing spotting on flowers; the damage occurs in the form of halo dots on sepals or petals and appear very similar to Botrytis spotting; use Cygon every six weeks as a pot only drench. A67-499 0
THRIPS: On Vandas and Ascocendas Flowers show scarred, burned, or misshapened from the feeding, especially in South Florida; control them by applying wettable powders such as Sevin, or Orthene. F81-153 0

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