Pear Psylla

Common Name: Pear Psylla

Genus: Cacopsylla

Species: pyricola

Identification: see lifecycle

Lifecycle: The pear psylla overwinters as the adult under bark of trees. In the spring, the females deposit orange-yellow eggs in cracks in the bark or around the buds. They hatch in 2 weeks to a month and small, wingless yellow nymphs suck sap from the underside of the leaf. These nymphs take about a month to mature and pupate. Three to five generations can occur in a season.

Geographic Distribution: Spread from Pacific Coast to all pear-growing states.

Damage and Treatment: The leaves on heavily infested trees turn brown and often drop off. The fruit drops or is undersized and is of poor quality. The leaves and fruit can also be covered with a black fungus that feeds on the honeydew produced by the larvae. Psylla also transmit pear decline disease, which can cause death of the tree. Treatment should be made when insect populations and/or damage levels reach economic thresholds. Refer to local University Extension Pest Management Guidelines for specific state thresholds.

Apples

Fruits Nuts Trees and Vegetables

Alfalfa Weevil Hypera

Amaranthes Amaranthus palmeri, Amaranthus hybridus, Amaranthus spinosus

Aphids Therioaphis maculata, Dysphis plantaginea, Acyrthosiphon kondoi, Acyrthosiphon kondoi, Acyrthosiphon pisum, Aphis gossypi

Armyworm, Beet Spodoptera

Cabbage Looper Trichoplusia

Codling Moth Cydia

Colorado Potato Beetle Leptinotarsa

Common Cocklebur Xanthium

Cutworms Agrotis ipsilon, Agrotis orthogonia, Peridroma saucia

Fall Armyworm Spodoptera

Green Peach Aphid Myzus

Kochia Kochia

Lambsquarters Chenopodium

Leafminer Liriomyza trifolii, Liriomyza sativa, Liriomyza huidobrensis

Leafroller Archips rosanus, Archips argyrospila, Argyrotaenia velutinana, Choristorenra rosaceana

Lygus Bug Lygus

Nightshades Solanum americanum, Solanum nigrum, Solanum ptycanthum, Solanum saccachoides

Panicum, Fall Panicum

Pennsylvania Smartweed Polygonum

Pigweed, Redroot Amaranthus

Silverleaf Whitefly Bemisia tabaci, Bemisia argentifolii

Stink Bug Nezara viridula, Chlorockroa say, Euschistus consperus

Sweet Potato Silverleaf Whitefly Bemisia tabaci, Bemisia argentifolii

Tarnished Plant Bug Lygus

Tobacco Budworm Helicoverpa

Velvetleaf Abutilon

Venice Mallow Hibiscus

Wild Mustard Brassica

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