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	Location	Reference
	1989	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.
	1989	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.
	1980	USA -- Oregon	Westigard, P. H. 1980. Personal communication.