Reported Resistance Case(s)

Species: psylla pyricola

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

Active Ingredient: parathion

MOA: Acetylcholine esterase inhibitors, Organophophates
Group: OP	CAS #: 56382	Shaugnessy Code: 57401

Resistance Case(s)

Case Id	Year of Report	Type of Resistance	Location	Reference
G4206	1984	Field Evolved Resistance	USA-- Utah	Davis, D.W. (1984). Personal communication.
G2475	1974	Field Evolved Resistance	USA-- Michigan	Howitt, A.J. (1974). Communication to FAO.
G2029	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..
G1242	1967	Field Evolved Resistance	USA-- Washington	(1967). Report of the First Session of the FAO Working Party of Experts on Resistance of Pests to Pesticides.. FAO, Rome 1965.
G815	1965	Field Evolved Resistance	Canada-- Ontario	Simpson, C.M. (1965). In: FAO 1967.

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