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Keywords
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longevity, fecundity, efficiency, broad been, black bean phid, Lysiphlebus fabarum
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Abstract
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Lysiphlebus fabarum Marshall is a polyphagous species and as one of the dominant parasitoid species of black bean aphid, Aphis fabae (Hemiptera: Aphididae) has appropriate efficiency in reducing the population of this pest on crops and weeds. Effect of different cultivars of host plants is an interesting field of research and helps to understand the relationship among host plant, pest, natural enemy and integrated pest management. In this study, the impact of different broad bean cultivars (G-f-5, G-f-20, G-f-21, G-f-560 and Qaramalek as native cultivar) was investigated on biological parameters of L. fabarum (by feeding from A. fabae) at 21±1 ºC, 60±5 % RH, 16:8 h (light: dark) in the germinator by Carey (1993) method. Results showed that the highest and lowest parasitism rates were on Qaramalek (65.00±2.28%) and G-f-560 (37.46±0.63%) respectively. The highest adult emergence rate and the lowest longevity and fecundity were on G-f-21 (90.61±2.8%, 3.16±0.23 days and 85.20±3.69 eggs respectively). The lowest and highest developmental time were on Qaramalek (6.75±0.17 days) and G-f-5 (7.98±0.15 days), respectively. In conclusion, it can be stated the parasitism rate of L. fabarum on Qaramalek was higher than on other four cultivars, but its efficiency on the other cultivars, with a small difference, was almost the same.
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