Document Type : Paper, Persian
Authors
1
Department of Plant Protection, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, ‎Iran‎
2
Department of Plant Protection, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili
3
Department of Plant Protection, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Adrabil, Iran.
4
Department of Plant Protection, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran.
5
Department of Horticultural Sciences and Landscape Engineering, Faculty of Plant Production, Gorgan University of ‎Agricultural Sciences and Natural Resources, Gorgan, Iran
10.22117/jesi.2024.364476.1584
Abstract
Different cultivars of a host plant can have an important effect on the behavioral charectristics of natural enemies. In this study, the effect of three wheat cultivars (Ehsan, Morvarid, and Tirgan) on functional responses of 4th instar larvae and adult males and females of Hippodamia variegata Goeze on different densities (2, 4, 8, 16, 24, 32, 64, 96, 128, and 160) of 4-d-old nymphs of Schizaphis graminum Rondani was studied. The experiments were conducted at 25±2 ˚C, 65±5% RH and 16L:8D h photoperiod. The logistic regression analyses revealed that the functional responses of different growth stages of H. variegata to S. graminum on differen wheat cultivars were type II. According to the results, the highest attack rate was estimated for 4th instar larvae of H. variegata on Ehsan and Tirgan cultivars (0.152 and 0.154 h-1, respectively). Also, the lowest handling time (0.127 h) was valued for 4th instar larvae on Ehsan cultivar. The predation rate of 4th instar larvae of H. variegata was also highest on Ehsan cultivar. The results of this study revealed the high efficiency of 4th instar larvae of H. variegata in feeding on S. graminum on Ehsan cultivar followed by Tigasn and Morvarid cultivars. Similar results were obtained for adult femles and males of the predator. However, further studies are necessary to evaluate the effect of these cultivars on searching bahavior and consumption rate of different stages of H. variegata on S. graminum under natural conditions.
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