Spray Volume Measurement as an Interface Between Laboratory and Field Efficacy Data

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Examination of spray volume and deposit data from two field applications of chemical toxicants to western spruce budworm, Chorisroneura occidentalis Freeman, and one field application to Douglas-fir tussock moth, Orgyia pselidorsugata (McDunnough), revealed that spray volume assessed on the ground beneath trees or at tree drip lines realistically estimated the dosage to which insects were actually exposed. The estimated dosage variable can be used with the logic of a laboratory-based efficacy model to calculate expected mortality. For the three data sets examined, prediction success as measured by a X2 goodness-of-fit test ranged from 73 to 95%. Mean percent mortality calculated by the model was within 5% of that actually observed in all cases. Feedback between results of field applications and predictions of the efficacy model by means of the spray volume interface will permit more precise selection of dosages and timing of spray applications and identification of situations needing further laboratory investigation.

Document Type: Research Article

Publication date: April 1, 1983

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