What's eating my wisteria 'amethyst falls'?

Wisteria 'Amethyst Falls' faces aphids and scale insects on its woody stems and new growth, plus vine weevil on container plants. Japanese beetle is a significant defoliator in eastern North America. Caterpillars occasionally eat leaves. Aphids colonising tender shoot tips are the most commonly reported problem in both the US and UK.

Dense colonies on new shoots and flower buds; leaf curl, sticky honeydew, sooty mould; reduced flowering if shoot tips are heavily infested Spray with insecticidal soap or neem oil; encourage ladybirds and parasitic wasps; cut out the worst-affected shoot tips

Skeletonised leaves with only the veins remaining; beetles feed in clusters on foliage and occasionally flowers Hand-pick adults into soapy water in the morning; use kaolin clay spray as a deterrent; apply neem oil; use milky spore or nematodes to target grubs in turf

Brown, dome-shaped scales on bark and woody stems; honeydew and sooty mould; branch dieback if severe Scrape off with a stiff brush; apply dormant horticultural oil in late winter to smother eggs; use a systemic insecticide in late spring when crawlers are active

Notched leaf margins from adults; larvae eat roots in containers, causing sudden wilting or collapse Apply pathogenic nematodes to compost in containers in late summer; use vine weevil killer granules; top-dress containers with grit to discourage egg laying