Influence of different host plants of bird cherry-oat aphid, Rhopalosiphum padi L. (Hemiptera: Aphididae) on some population parameters of ladybird, Hippodamia variegata (Goeze) (Coleoptera: Coccinellidae)

Nouroozi, Vahideh and Golizadeh, Ali and Hassanpour, Mahdi and Fathi, Ali Asgar (2016) Influence of different host plants of bird cherry-oat aphid, Rhopalosiphum padi L. (Hemiptera: Aphididae) on some population parameters of ladybird, Hippodamia variegata (Goeze) (Coleoptera: Coccinellidae). Masters thesis, university of Mohaghegh Ardabili.

Text (اثر گیاهان میزبان شته برگ یولاف Rhopalosiphum padi L. (Hemi.: Aphididae) روی برخی پارامترهای جمعیت کفشدوزک شکارگر Hippodamia variegata (Goeze) (Col.: Coccinellidae)) Vahideh Nouroozi.pdf Download (1MB)

Abstract

The coccinellid beetels are one of the most useful biological control agents in agricultural ecosystems. The predator coccinellid, Hippodamia variegata (Goeze) (Col.: Coccinellidae) has been distributed widely in the world and Iran and it has particular importance in aphid population reduction. In this research, the effect of four host plants of bird cherry-oat aphid, Rhopalosiphum padi L. (Hemiptera: Aphididae) including wheat, barley, maize and triticale on some population parameters of H. variegata were evaluated under laboratory conditions, 25±1°C, 65±5% relative humidity, and a photoperiod of 16:8 h (Light: Dark). In order to doing the experiments, a cohort of newly laid eggs were randomly selected and transferred into Petri-dishes. After eggs hatching, each larvae were transferred individually into experimental containers and were fed with aphids. Duration of different immature stages of H. variegate were reorded until death time. After adults emergence, each female and male were paird and then female fecundity and adult longevity were reorded. The data obtained from this study were analyzed using age stage, two sex life table program. According to results, the longest and shortest developmental time was observed on barley 16.91 day and wheat 15.13 day for female, respectively. The intrinsic rate of increase (rm) of ladybird fed on R. padi, were estimated to be 0.184, 0.174, 0.177 and 0.163 female/female/day on wheat, barley, maize and triticale, respectively. The finite rate of increase (λ) of ladybird fed on R. padi, determined on respected host plants were calculated as 1.202, 1.192, 1.194 and 1.177 female/female/day, respectively. Net reproductive rate (R0) values on the respected four host plants were 209.74, 278.23, 263.42 and 158.61 (females/female/generation), respectively. Moreover, mean generation time (T) of ladybird calculated as 28.94, 32.13, 31.30 and 30.80 days on respected host plants, respectively. These findings showed that four tested host plant of R. padi were suitable to complete the life cycle and reproduction of H. variegata and H. variegata had higher population rate on wheat compaired with other host plants tested. Moreover the intrinsic rate of increase (rm) valus for R. padi on respected host plant was recorded as 0.411, 0.311, 0.283 and 0.334 female/female/day, respectively. The comparison of these parameters for aphid and ladybird on each tested host plant revealed that this predator have higher potential in R. padi control on maize relatively and there is a need to do more research on the utilization of this predation in aphid control programs.

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