A TEMPERATURE- AND AGE-DEPENDENT SIMULATION MODEL OF REPRODUCTION FOR THE NORTHERN CORN ROOTWORM, DIABROTICA BARBERI SMITH AND LAWRENCE (COLEOPTERA: CHRYSOMELIDAE)

Abstract

Based on data collected at seven constant temperatures, a temperature- and age-dependent model for reproductive development and oviposition by Diabrotica barberi Smith and Lawrence was developed. The model couples temperature-dependent rate and temperature-independent distribution models to represent the observed variability in developmental times for pre-reproductive, reproductive, and post-reproductive females. Using a cohort approach to maintain a physiological age structure, development was coupled with a temperature- and age-dependent model of oviposition. The model was validated at one constant-temperature and three variable-temperature regimes in the laboratory. The time spent in the pre-reproductive stage was slightly underestimated by the model, but the development of mature females and both the timing and magnitude of oviposition under fluctuating-temperature regimes were accurately predicted. The model was relatively insensitive to errors in estimation of the rate of development in the pre-reproductive stage but sensitive to errors in estimation of developmental rate of the reproductive stage and fecundity. Errors in input temperatures were found to be very important, stressing the need for accurately measuring temperature, The major driving variable. The model should be a valuable aid toward understanding oviposition by D. barberi in the field.

Western Corn Rootworm,Diabrotica virgifera virgiferaLeConte (Coleoptera: Chrysomelidae), Oviposition: A Variant’s Response to Maize Phenology

“…InterÞeld dispersal of D. v. virgifera is common; females immigrate into Þrst-year maize (Godfrey and Turpin 1983). Although maize phenology has been shown to inßuence northern corn rootworm, Diabrotica barberi Smith and Lawrence, dispersal (Naranjo and Sawyer 1988) and is thought also to affect movement of D. v. virgifera (Naranjo 1991), its role in D. v. virgifera movement into soybeans has not been studied in large-scale Þeld trials.…”

Western Corn Rootworm (Coleoptera: Chrysomelidae) Feeding on Corn and Soybean Leaves Affected by Corn Phenology

“…InterÞeld dispersal of western corn rootworms is common, with Þrst-year cornÞelds a site of female immigration (Godfrey and Turpin 1983). While corn phenology has been shown to inßuence northern corn rootworm (Diabrotica barberi Smith & Lawrence) dispersal (Naranjo and Sawyer 1988), and is thought also to affect movement of western corn rootworm (Naranjo 1991), its role in western corn rootworm movement into soybeans has not been investigated.…”

Models of Diabrotica Populations: Demography, Population Genetics, Geographic Spread, and Management

“…In a series of papers, Naranjo described the creation and analysis of a relatively detailed model of DB adult dynamics over time in a single field of corn ( Zea mays ). In an excellent paper, Naranjo and Sawyer [ 52 ] described their core submodel for DB reproduction. Their model had temperature-dependent maturation through the adult stage and time and age-dependent oviposition.…”