Reported Resistance Case(s)

Species: psylla pyricola

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

Active Ingredient: endosulfan

MOA: GABA-gated chloride channel antagonists, Cyclodiene organochlorines
Group: CYCLO	CAS #: 115297	Shaugnessy Code: 79401

Resistance Case(s)

Case Id	Year of Report	Type of Resistance	Location	Reference
G4339	1985	Field Evolved Resistance	USA-- Oregon	Follett, P. A., Croft, B. A. and Westigard, P. H. (1985). Regional resistance to insecticides in Psylla pyricola from pear orchards in Oregon.. Can. Entomol., 117 565-573.
G4242	1984	Field Evolved Resistance	USA-- Utah	Davis, D.W. (1984). Personal communication.
G3998	1981	Field Evolved Resistance	USA-- Washington	Kain, W.M. (1981). Personal communication.
G2612	1974	Field Evolved Resistance	USA-- Michigan	Howitt, A.J. (1974). Communication to FAO.

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