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Poster Display

Plant-Insect Ecosystems

Poster: P-IE, Field Crops IPM

Predicting the seasonal phenologies of major noctuid pests in Oregon agroecosystems

Tuesday, November 11, 2025
9:00 AM - 5:00 PM Pacific
Location: Exhibit Hall A-A1, OCC
Poster Display
Lepidopteran pests within family Noctuidae pose a significant economic threat in Oregon grass seed and vegetable production systems. Effective management of these species relies on timely foliar insecticide applications targeting immature larvae before crop damage is observed. Regionally specific phenological models serve as a critical component of effective areawide pest management plans to inform the timing of pest monitoring and management action. Seasonal modeling of adult phenology (and subsequent larval populations) is often complicated by the migratory behavior of several noctuid species as well as limited knowledge of temperature-dependent development on affected crop hosts. Growth chamber experiments at five constant temperatures (12 to 32°C) were conducted to determine the temperature-dependent development of black cutworm, true armyworm, and winter cutworm life stages on an artificial and perennial ryegrass diet. The timing of migrant adults was predicted with surface air temperature using non-linear regression with abundance data collected from pheromone-baited traps in >100 commercial grass seed and vegetable production fields from 2021 to 2025. Regionally validated phenology models can be incorporated into decision support tools to forecast the spatiotemporal occurrence of crop-damaging life stages of priority insect pests.