caa a22 4500 397571933 CHVBK 20180308164844.0 cr unu---uuuuu 161202e19960801xx s 000 0 eng 10.1093/ee/25.4.842 doi (NATIONALLICENCE)oxford-10.1093/ee/25.4.842 Grape Phylloxera (Homoptera: Phylloxeridae) Temperature Threshold for Establishment of Feeding Sites and Degree-Day Calculations [Elektronische Daten] [Michele Turley, Jeffrey Granett, Amir D. Omer, John A. De Benedictis] In laboratory bioassays with grape, Vitis vinifera L., roots, grape phylloxera, Daktulosphaira vitifoliae (Fitch), did not develop beyond egg hatch when held at a constant 18°C. However, a 2-d exposure to 24°C during the 1st instar prompted some insects to develop. On preformed feeding sites, phylloxera were able to develop at 18°C without any exposure to 24°C. These data suggest that the threshold temperature for establishment of a feeding site is >18°C, and that the temperature threshold for maintenance of the feeding site, nutrient extraction and development is <18°e. Calculations of degree-days necessary for development from egg hatch to the adult stage in temperature regimes that are not constant give values different from calculations from bioassay data collected at constant temperatures. Therefore, current threshold and degree-day data for grape phylloxera are insufficient for predicting population growth in the field where temperatures vary. © 1996 Entomological Society of America Physiological and Chemical Ecology nationallicence grape phylloxera nationallicence grape nationallicence temperature nationallicence threshold nationallicence degree-day nationallicence Turley Michele Entomology Department, University of California, Davis CA 95616 aut Granett Jeffrey Entomology Department, University of California, Davis CA 95616 aut Omer Amir D. Entomology Department, University of California, Davis CA 95616 aut De Benedictis John A. Entomology Department, University of California, Davis CA 95616 aut Environmental Entomology Oxford University Press 25/4(1996-08-01), 842-847 0046-225X 25:4<842 1996 25 ee https://doi.org/10.1093/ee/25.4.842 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/ee/25.4.842 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Turley Michele Entomology Department, University of California, Davis CA 95616 aut NATIONALLICENCE 700 1- Granett Jeffrey Entomology Department, University of California, Davis CA 95616 aut NATIONALLICENCE 700 1- Omer Amir D. Entomology Department, University of California, Davis CA 95616 aut NATIONALLICENCE 700 1- De Benedictis John A. Entomology Department, University of California, Davis CA 95616 aut NATIONALLICENCE 773 0- Environmental Entomology Oxford University Press 25/4(1996-08-01), 842-847 0046-225X 25:4<842 1996 25 ee Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford