Reported Resistance Case(s)

Species: psylla pyricola

Order	Family	Common Name(s)	Group	Host
homoptera	psyllidae	pear psylla	AG	pear

Active Ingredient: fenvalerate

MOA: Sodium channel modulators, Pyrethroids, Pyrethrins, DDT
Group: PYR	CAS #: 51630581	Shaugnessy Code: 109301

Resistance Case(s)

Case Id	Year of Report	Type of Resistance	Location	Reference
G5135	1989	Field Evolved Resistance	Canada-- British Columbia	Croft, B. A., Burts, E. C., van de Baan, H. E., Westigard, P. H., and Riedl, H. (1989). Local and regional resistance to fenvalerate in Psylla pyricola Roerster (Homoptera: Psyllidae) in western North America.. Can. Entomol., 121 122-129.
G5136	1989	Field Evolved Resistance	USA-- Washington	Croft, B. A., Burts, E. C., van de Baan, H. E., Westigard, P. H., and Riedl, H. (1989). Local and regional resistance to fenvalerate in Psylla pyricola Roerster (Homoptera: Psyllidae) in western North America.. Can. Entomol., 121 122-129.
G3851	1980	Field Evolved Resistance	USA-- Oregon	Westigard 1980. (1980).

*The population was created solely by selection and/or genetic manipulation.
**The population was selected further in the laboratory after collection.