Intra-specific and intra-guild predation of two native Aphidophagous Coccinellids

Intra-specific predation (ISP) and intra-guild predation (IGP) were evaluated using adult female and fourth instar larvae of the ladybird beetles Harmonia eucharis and Adalia tetraspilota in laboratory by providing different densities of Aphis pomi as primary target prey and with H. eucharis and A. tetraspilota predator eggs (preference) and without eggs (non-preference). Adults of both coccinellids used together, the result showed non-significant difference between ISP of A. tetraspilota and IGP of H. eucharis, only exception of no aphid with eggs under preference condition and in 4^th instar larvae, the IGP of H. eucharis was significantly higher to ISP of A. tetraspilota. In general, IGP of H. eucharis was always higher than ISP. The two abundant native species were equally like to prey upon one another. But H. eucharis was stronger than A. tetraspilota due to their big size. IGP was very frequent between the two native species, but neither had an advantage over the other. ISP was less frequent than IGP in case of H. eucharis.