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Identifying vine weevil on Pieris
Adults: dull black beetles with pitted wing cases, active at night. Larvae: white C-shaped grubs in soil.
cycle
Life cycle
Adults emerge spring/summer. Larvae overwinter in soil eating roots. One generation per year.
warning
Damage to Pieris
Adults notch leaf margins. Larvae devastate root systems, causing sudden plant collapse.
healing
How to treat vine weevil on Pieris
Nematodes (Steinernema kraussei) applied to moist soil in spring/autumn. Systemic insecticide.
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Preventing vine weevil on Pieris
Check rootballs when repotting. Sticky traps. Nematodes as preventive measure.