title: Demographic Assessment of Plant Cultivar Resistance to Insect Pests: A Case Study of the Dusky-Veined Walnut Aphid (Hemiptera: Callaphididae) on Five Walnut Cultivars.
abstract: To provide a comprehensive evaluation of walnut cultivar resistance to the dusky-veined walnut aphid, Panaphis juglandis (Goeze), we collected the life table data of this aphid reared on five cultivars of walnut ('Akça I,' 'Chandler,' 'Fernette,' 'Fernor,' and 'Pedro') under field conditions. The raw data of the developmental time, survival rate, and fecundity was analyzed using the age-stage, two-sex life table to account for the variable developmental rate and stage differentiation among individuals. Due to the species' longer immature developmental time, shorter adult longevity, shorter reproduction period, and lower fecundity, the net reproduction rate (R0=5.9 offspring), intrinsic rate of increase (r=0.0983 d(-1)), and finite rate (λ=1.1034 d(-1)) were the lowest when aphids were reared on the Fernor cultivar, while those reared on Akça I exhibited the highest population parameters (R0=18.0 offspring, r=0.2031 d(-1), and λ=1.2252 d(-1)). Based on the population characteristics, Fernor is a less favorable cultivar for the development and reproduction of P. juglandis. We also demonstrated the advantages of using bootstrapping for the analysis of standard errors of developmental time, longevity, fecundity, and other parameters as well. Our results indicated that demographic analysis of pest development, survival, and reproduction based on the age-stage, two-sex life table offers a comprehensive assessment of pest growth potential on different crop cultivars.
authors.affiliation: Department of Plant Protection, Faculty of Agriculture, University of Yuzuncu Yil, 65080 Van, Turkey.
authors.forename: Evin Polat
authors.initials: EP
authors.lastname: Akköprü
authors.affiliation: Department of Plant Protection, Faculty of Agriculture, University of Yuzuncu Yil, 65080 Van, Turkey. ratlihan@yyu.edu.tr.
authors.forename: Remzi
authors.initials: R
authors.lastname: Atlıhan
authors.affiliation: Department of Animal Sciences, Faculty of Agriculture, University of Yuzuncu Yil, 65080 Van, Turkey.
authors.forename: Hayrettin
authors.initials: H
authors.lastname: Okut
authors.affiliation: Laboratory of Theoretical Ecology, Department of Entomology, National Chung Hsing University, Taichung, Taiwan, Republic of China.
authors.forename: Hsin
authors.initials: H
authors.lastname: Chi
mesh_terms: D000818:Animals; D001042:Aphids / Q000254:growth & development*; D005298:Fertility; D060434:Herbivory; D031324:Juglans / Q000276:immunology*; D008136:Longevity; D013045:Species Specificity
keywords: Panaphis juglandis; life table; walnut cultivar