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Survival, development and life tables of two congeneric ladybirds in aphidophagous guilds

Insect Science 2006年第2期13卷 119-126页

作者： AVANISH K. GUPTA SHEFALI SRIVASTAVA GEETANJALI MISHRA KALPANA SINGH OMKAR Ladybird Research Laboratory Department of Zoology University of Lucknow Lucknow India

Two congeneric aphidophagous ladybirds, Coccinella septempunctata and Coccinella transversalis, were reared on three aphid species, Lipaphis erysimi, Myzus persicae and Aphis nerii, to estimate the effect of prey quality and intra- and interspecific interactions on their survival and development of life stages. Mortality of first instar ladybirds of both species was highest feeding on A. nerii. Preimaginal mortafity was lowest when feeding on L. erysimi （C. septempunctata, 1.6% and C. transversalis, 3.2%）, and highest when feeding on A. nerii （ C. septempunctata, 6.2% and C. transversalis, 8.2%）. Comparatively higher weight and larger size of C. septempunctata along with the lower levels of mortality recorded suggested that it is more likely to have acted as an intraguild predator than C. transversalis. High recorded mortality of C. transversalis is attributed to probable intraguild predation on account of its smaller size. The major sources of mortality were probably cannibalism, intraguild predation and other unknown factors. Lower prey quality increased the incidence of cannibalism and intraguild predation, especially in C. transversalis. The investigation suggests an intrinsic competitive advantage for C. septempunctata over C. transversalis in guilds of three aphid species.

关键词： Coccinella septempunctata Coccinella transversalis ladybirds life table,aphids cannibalism intraguild predation

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Aphids-induced plant volatiles affect diel foraging behavior of a ladybird beetle Coccinella septempunctata

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Insect Science 2020年第6期27卷 1266-1275页

作者： Milda Norkute Ulf Olsson Velemir Ninkovic Department of Ecology Swedish University of Agricultural SciencesUppsalaSweden Department of Energy and Technology Swedish University of Agricultural SciencesUppsalaSweden

The ladybird beetle Coccinella septempunctata(L.)is an important biocontrol agent of pests such as various aphid *** being one of the most studied coccinellid species,many aspects of its foraging behavior are still not completely *** study focuses on the diel foraging behavior of ***,investigating their olfactory orientation toward aphid-infested plants,walking activity on plants and on the soil,and feeding *** the scotophase the ladybird beetles were significantly more attracted to the odor of aphid-infested plants,on which they also showed considerably higher walking activity then on uninfested *** were more prone to utilize olfactory cues when searching for prey and fed at higher rates than males;this shows that they are better adapted to nocturnal activity,as they require higher food *** septempunctata have the same feeding rate during the scotophase as in the *** study shows that *** has the potential to forage in the scotophase if prey is *** results support the hypothesis that volatiles of aphid-infested plants can attract or arrest foraging adult ladybird beetles,even in the darkness,which makes a considerable contribution to efficient prey search and enhances feeding capacity.

关键词： aphids C7 feeding ladybirds photophase scotophase

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