Spider Mites
Tetranychidae
Mites & Ticks (Arachnids) High Risk 0.3-0.5 mm
📖 Description
Spider mites are not insects but tiny arachnids related to spiders and ticks. They are among the most persistent and difficult-to-control plant pests, particularly indoors and in greenhouses where dry, warm conditions favor their explosive reproduction. A single female can produce 100+ eggs in her lifetime, and populations can explode from undetectable to devastating in just 2-3 weeks. Their fine webbing protects them from predators and many sprays. They feed by piercing individual plant cells and sucking out the contents, leaving characteristic stippling that accumulates into widespread bronzing and leaf death.
⚠️ Symptoms to watch for
- Fine silk webbing on leaf undersides and between stems,Tiny yellow or white stippling dots on leaf surfaces,Leaves turning bronze, yellow, or brown,Premature leaf drop,Tiny moving dots on webbing (visible with magnification),Overall plant decline and reduced vigor
🩹 Treatment
- Spray plants forcefully with water every 2-3 days (organic),Release predatory mites (Phytoseiulus persimilis) (organic),Apply insecticidal soap to leaf undersides (organic),Spray with neem oil every 5-7 days (organic),Use horticultural oil to smother mites and eggs (organic),Apply abamectin or bifenazate miticide (chemical)
🌿 Organic treatments
- Spray plants forcefully with water every 2-3 days,Release predatory mites (Phytoseiulus persimilis),Apply insecticidal soap to leaf undersides,Spray with neem oil every 5-7 days,Use horticultural oil to smother mites and eggs
🧪 Chemical treatments
- Apply abamectin or bifenazate miticide
🛡️ Prevention
- Maintain adequate humidity — mites thrive in dry conditions,Mist plants regularly to create unfavorable conditions,Inspect new plants before introducing to collection,Avoid over-fertilizing with nitrogen which attracts mites,Clean plant leaves regularly to remove dust and early colonies,Avoid stressing plants with underwatering
🪴 Affected plants
- Indoor Plants,Tomatoes,Roses,Strawberries,Beans,Cucumbers,Houseplants
🦋 Natural predators
- Predatory Mites,Ladybugs,Green Lacewings
🌱 Host plants
- Various garden plants,Fruit trees,Vegetables
🔄 Lifecycle
- Eggs are laid on leaf undersides, often under webbing.
- Eggs hatch in 3-5 days.
- Larvae pass through protonymph and deutonymph stages before becoming adults in 5-10 days.
- Under optimal conditions (hot and dry), the entire lifecycle takes just 7-10 days.
- Females can reproduce without mating.
- In cold climates, they overwinter as eggs or mated females in protected locations.
📅 Season
- Year-round indoors, Summer outdoors (peak in hot, dry weather)
🔎 Appearance
- Microscopic arachnids barely visible to the naked eye.
- Appear as tiny moving dots on leaf undersides.
- Fine webbing between leaves and stems is the most visible sign.
- Two-spotted spider mites have two dark spots on their body.
💥 Damage level
- High
🔁 Reproduction rate
- Rapid
🗺️ Geographic regions
- North America
- Europe
- Asia
- Africa
- Australia
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