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Identifying spider mites on Rosemary
Fine stippling on the needle-like leaves with a dull, dusty look, and delicate webbing in heavier infestations, most likely during hot, dry weather.
cycle
Life cycle
Complete life cycle in 1–2 weeks in hot, dry conditions. Can produce 13+ generations per year.
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Damage to Rosemary
Feeding causes stippled, discoloured foliage, though Rosemary's tough, needle-like leaves generally tolerate mites longer than softer-leaved plants before serious damage sets in.
healing
How to treat spider mites on Rosemary
Spray forcefully with water to dislodge mites, and increase humidity slightly around the plant if it's kept indoors in very dry air.
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Preventing spider mites on Rosemary
Rosemary's own preference for good airflow (rather than stagnant air) also happens to discourage the still, dry conditions spider mites favour most.