Reported Resistance Case(s)

Species: psylla pyricola

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

Active Ingredient: toxaphene

MOA: GABA-gated chloride channel antagonists, Cyclodiene organochlorines
Group: CYCLO	CAS #: 8001-35-2	Shaugnessy Code: 80501

Resistance Case(s)

Case Id	Year of Report	Type of Resistance	Location	Reference
G2018	1972	Field Evolved Resistance	USA-- Oregon	Westigard, P. H. and Zwick, R. W. (1972). The pear psylla in Oregon.. Oreg. State Univ. Agric. Stn. Tech. Bull. 122, 22 pp..
G188	1959	Field Evolved Resistance	USA-- Washington	Harries, F. H. and Burts, E. (1959). Laboratory studies of pear psyllas resistant to dieldrin and some related compounds.. J. Econ. Entomol., 52 530.

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