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Orchid Pests and Diseases Diagnosis, Treatment and Prevention

Orchid Pests and DiseasesDiagnosis, Treatment and Preventionby Sue Bottom, Orchid Pests Plant Sap Feeding Insects Scale Mealybugs Aphids Thrips Whiteflies Spider Mites Chewing Pests snails and slugs Caterpillars Roaches and GrasshoppersSymptoms and Treatment of Sap Feeding InsectsScaleSymptoms: Scale are sucking insects that attach to and feed on the underside of leaves, in leaf axils, on pseudobulbs and on rhizomes. They often are hidden under old leaves and pseudobulb sheaths. Severe infestations cause chlorotic areas to appear on the leaves and plant surfaces which will yellow and may darken and can cause the leaf to drop : If there are only a few scale, use a Q tip dipped in isopropyl alcohol or toothbrush dipped in a pesticide like Malathion, Orthene or Safer Soap (used per label instructions) to physically remove sc

Snails and Slugs Symptoms: These mollusks will leave holes and notches in the leaves, flowers roots and may chew off the growing tips. Chewed areas may also appear on buds. These nocturnal pests travel on a layer of slime and this slime trail is evidence of their presence. Treatment: Chemical baits may be placed in the growing area.

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