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Development stages of western grapeleaf skeletonizer in central San Joaquin Valley commercial vineyards*

Generation Adults Eggs Larvae
First Late April to mid-May Late April to mid- to late May Early May to late June
 
Second Late June to ealry July Late June to mid-July July to mid-August
 
Third Late August to early September Late August to mid-September September and October
 

* Data were collected in Tulare County. Time periods may change slightly in warmer or cooler areas.

Statewide IPM Program, Agriculture and Natural Resources, University of California
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