Abstract
A destructive population of the walnut serpentine leaf miner, Nepticula juglandifoliella Clem., was encountered infesting English walnut in a localized area ill the Salinas Valley near King City, California. This is the first report of this insect's causing serious damage to walnut in this State. Two hundred of 600 acres were either severely or seriously damaged. It is believed that under ordinary conditions the pest is held in cheek by natural enemies and that treatments of demeton applied to control the walnut aphid may have interfered with effective parasitism. Parasites were very abundant and the following species of the family Eulophidae were reared from infested leaves: Closterocerus utahensis californicus Girault, Zagrammosoma nigrolineatum Cwfd., and Solenotus begini (Ashm.).
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