Brown marmorated stink bug
Halyomorpha halysSunken white or yellow blotches on tomato and pepper, scarred and misshapen fruit; crowds in the house every autumn
Earwigs
Forficula auriculariaRagged holes in petals, seedlings and soft fruit, chewed overnight
Citrus mealybug
Planococcus citriWhite cottony clusters in leaf axils, sticky honeydew below
Boxelder bugs
Boisea trivittataCrowds on sunny walls in autumn and bugs indoors over winter; almost no harm to trees
Chinch bugs
Blissus spp. (B. insularis, B. leucopterus hirtus)Sap feeding at the base of the grass; sunny patches yellow, brown and die
Bagworms
Thyridopteryx ephemeraeformisBrown, thinning evergreens hung with spindle-shaped bags of needles
Black bean aphid
Aphis fabaeDense black colonies on shoot tips, curled leaves, honeydew, poor pod set
Brown soft scale
Coccus hesperidumFlat brown bumps on stems and veins; heavy honeydew
Colorado potato beetle
Leptinotarsa decemlineataDefoliated tops, orange egg clusters
Blister beetles
Epicauta spp. and other MeloidaeFlowers and leaves chewed by clusters of long, soft-bodied beetles in midsummer
Cabbage worms
Pieris rapaeLarge ragged holes in brassica leaves, caterpillars and green frass in the heads
Cutworms
Noctuidae (Agrotis ipsilon, Peridroma saucia and others)Seedlings cut through at the soil line overnight
Cabbage looper
Trichoplusia niRagged holes between leaf veins; frass in the heads
Black vine weevil
Otiorhynchus sulcatusNotched leaf edges above, C-shaped grubs eating the roots below
Corn earworm
Helicoverpa zeaEar tips eaten and full of frass; holes in tomato fruit
Codling moth
Cydia pomonellaWorm holes in apples and pears, with brown frass at the entry and a tunnel to the core
Eastern tent caterpillar
Malacosoma americanumDense silk tents in branch forks in spring; leaves stripped around them
Cottony cushion scale
Icerya purchasiOrange-brown scales with fluted white egg sacs on twigs; honeydew and sooty mould
Broad mite
Polyphagotarsonemus latusTwisted, bronzed, brittle shoot tips
Bean leaf beetle
Cerotoma trifurcataSmall round holes scattered across bean leaves; scarred pods late in the season
Diamondback moth
Plutella xylostellaSmall holes and translucent "windowpanes" in brassica leaves; damaged growing points
Asparagus beetle
Crioceris asparagi (and the spotted asparagus beetle, C. duodecimpunctata)Brown, scarred spears that bend into a hook; stripped ferns; black eggs stuck on the spear tips
Beet armyworm
Spodoptera exiguaSkeletonised leaves, then holes in leaves and fruit
Billbugs
Sphenophorus spp.Larvae hollow grass stems and chew crowns; turf dies in patches
Boxwood leafminer
Monarthropalpus flavusBlistered, swollen, sometimes discoloured boxwood leaves; thin, ragged plants
Cross-striped cabbageworm
Evergestis rimosalisBuds and young leaves riddled with holes; single plants skeletonised while neighbours are clean
Citrus leafminer
Phyllocnistis citrellaSilvery winding mines and curled, distorted new citrus leaves
Cabbage aphid
Brevicoryne brassicaeDense grey waxy colonies; curled, yellowed leaves; contaminated heads and sprouts
Euonymus scale
Unaspis euonymiYellow spots on euonymus leaves; white-flecked stems; dieback
Cyclamen mite
Phytonemus pallidusCrinkled, cupped and stunted new leaves; withered buds
Chilli thrips
Scirtothrips dorsalisBronzed, curled new leaves; scarred buds and fruit
Asian citrus psyllid
Diaphorina citriTwisted, notched new leaves; spreads citrus greening (HLB)
Banded palm thrips
Parthenothrips dracaenaeDull, silvered leaves with dark varnish-like specks
Apple maggot
Rhagoletis pomonellaDimpled, pitted apples with brown winding trails through the flesh