pest_control
Aphids on St John's Wort
How to identify and get rid of aphids on St John's Wort. Size: 1–3mm.
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Identifying aphids on St John's Wort
Soft-bodied, pear-shaped insects in green, black, yellow, or brown. Often clustered on new growth and undersides of leaves.
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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 St John's Wort
Suck sap from soft tissue, causing distorted growth, sticky honeydew, and sooty mould. Can transmit viruses.
healing
How to treat aphids on St John's Wort
Spray with strong water jet to dislodge. Apply insecticidal soap or neem oil. Introduce ladybirds.
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Preventing aphids on St John's Wort
Encourage natural predators. Avoid excess nitrogen. Inspect new plants.