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 Botanic Garden >> Gardening >  >> Question and Answer >> Plant Diseases

Japanese Maple Bagworms: Remove Bags, Spray Bt

Maryland suburb: small light cocoons on fine threads at top of dwarf Japanese red maple. Top defoliating, spreading down.

Identification: Bagworms

Caterpillars in silk bags camouflaged with plant bits. One generation/year. Overwinter as eggs in female bag.

Control

  • Pick off bags in fall/winter (cut silk band to avoid girdling).
  • Spray Bt (Bacillus thuringiensis) late June after hatch.
  • Stomach insecticides (Sevin, Orthene, etc.) for older larvae.

Evergreens die from total defoliation; deciduous recover but weakened.

Link: Auburn Bagworm Guide

Plant Diseases
Japanese Red Maple Post-Transplant Leaf Spots: Need Photo
Japanese Maple Spring Leaf Damage: Herbicide Injury vs. Winter Kill
Japanese Maple Sunscald/Herbicide Damage: Environmental Stress Diagnosis
Phyllosticta Leaf Spot on Japanese Maple: Cosmetic Late-Season Fungus
Japanese Red Maple Aphids: Atomic Grow for Cleanup and Vigor
Japanese Maple Leaf Wither: Overwatering in Clay Soil Corrected by Deep Weekly Watering
Japanese Maple Bark Peeling: Often Normal Exfoliation
Caring for a Potted Japanese Maple Indoors: Moisture, Pot Size, and Winter Protection
Japanese Maple 'Emperor': Improved Cold Hardiness and Scarlet Fall Color
Japanese Maple Leaf Color: Sun and Genetics Drive Red Pigment
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Japanese Maple Leaf Scorch: Heat, Wind, and Root Moisture

Wax Scale on Japanese Maple: Identifying the White Domes and Timing Your Treatment

Weed Whacker Damage to Japanese Maple: Grafting Wax and Borer Protection

Valuing a Damaged Dwarf Japanese Maple: Need Certified Arborist Appraisal

Japanese Red Maple and Japanese Beetles: Manageable Risk

Minor Leaf Spots on Young Japanese Maple

Plants

Diagnosing Browning Leaves on a Japanese Dwarf Red Maple

Red Emperor Japanese Maple Losing Red Color: Stress or Variety Trait?

Diagnosing Leaf Scorch on a Japanese Maple: Watering, Sun, and Hot Tub Chemicals

Japanese Red Maple Main Trunk Dead, Basal Shoots Alive: Graft Failure?

Japanese Maple Leaf Scorch: Recovery and Prevention

Japanese Maple 'Red Emperor': Improved Bloodgood from Red Maple Nursery

Japanese Maple 'Bloodgood': The Classic Burgundy-Red Cultivar

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