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.

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Crops affected by Pear Psylla

Additional Pests

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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