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Identifying aphids on Rosemary
Small green insects occasionally clustered on new growth tips, though infestations are relatively uncommon on this aromatic herb.
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Life cycle
Reproduce rapidly without mating in spring/summer. One female can produce 80+ offspring per week. Multiple generations per year.
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Damage to Rosemary
Aphids sap-suck on tender new growth, though Rosemary's strong aromatic oils make it a less preferred host than softer, less fragrant plants.
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How to treat aphids on Rosemary
Spray forcefully with water to dislodge aphids, which is usually sufficient given light infestation levels typical on Rosemary.
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Preventing aphids on Rosemary
Good airflow and full sun, which Rosemary needs anyway, also discourage aphids from settling in the first place.