Effect of two resistant and susceptible wheat cultivars on biology and predation rate of Hippodamia variegata by feeding from Diuraphis noxia

In this study، the possible effects of host plant resistance on some demographic parameters and predation rate of Hippodamia variegata Goeze life stages have been investigated. Demographic data and predation rate have been analyzed by the age-stage two-sex life table and consumption rate program. Obtained results showed that preadult diuration and total preoviposition period (TPOP) of ladybirds that fed by Omid (resistant cultivar) originated aphids were significantly shorter (14. 99±0. 04 and 16. 96±0. 09 respectively). Additionally، time from egg to death (54. 09±3. 2)، adult longevity (48. 67±2. 8) and oviposition period (24. 24±1. 42) of these lady beetles were significantly longer. The average predation rate of first، second، third، fourth larval stages and male and females feeding on Omid cultivar were 30. 37±1. 77، 50. 51±2. 57، 83. 39±4. 39، 259. 52±6. 05، 4965. 47±241. 35 and 8516. 62±406. 67 and for Sardari were 28. 1±1. 16، 39. 37±2. 53، 86±4. 12، 210±6. 66،4750±376. 11 and 6971. 04±29، respectively.