Calag Archive
Calag Archive
Orchard tests substantiate: Role of pear psylla in pear decline
Publication Information
California Agriculture 17(1):4-6.
Published January 01, 1963
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Abstract
Field scale tests with young pear trees last year at Davis provided further evidence that the pear psylla (Psylla pyricola Foerster) plays a central role in the pear decline disease.