Abundance Factors

Baker, M., K. Hossain, K. Zabierek, K. Collie, A. Alyokhin, D. Mota-Sanchez, and M. Whalon. 2014. Geographic variation in cannibalism in Colorado potato beetle populations. Environmental Entomology 43: 102-109.

Abundance Factors /

Cannibalism can have a large effect on population growth and survival in stressful environments, possibly including those created by insecticide use. In this study, we collected Colorado potato beetles from three isolated areas in the northeastern United States known for high levels of resistance to neonicotinoids. We measured resistance to imidacloprid in each of those […]

Baker, M., K. Hossain, K. Zabierek, K. Collie, A. Alyokhin, D. Mota-Sanchez, and M. Whalon. 2014. Geographic variation in cannibalism in Colorado potato beetle populations. Environmental Entomology 43: 102-109. Read More »

Lamb, R. J., P. A. MacKay, and A. Alyokhin. 2013. Seasonal dynamics of three coexisting aphid species: implications for estimating population variability. Canadian Entomologist 145: 283-291.

Abundance Factors /

Seasonal patterns of abundance and population variability were determined for Macrosiphum euphorbiae (Thomas), Myzus persicae (Sulzer), and Aphis nasturtii (Kaltenbach) (Hemiptera: Aphididae) in potato plots from weekly samples for 28 years. All species showed a single annual peak, but arrived and reached peak abundance at different times. Population variability (PV, a proportion between 0 and 1) for the week of peak

Lamb, R. J., P. A. MacKay, and A. Alyokhin. 2013. Seasonal dynamics of three coexisting aphid species: implications for estimating population variability. Canadian Entomologist 145: 283-291. Read More »

Leppanen, C., A. Alyokhin, and S. Gross. 2012. Competition for aphid prey between different lady beetle species in a laboratory arena. Psyche: A Journal of Entomology 2012: Article ID 890327, 9 pp.

Abundance Factors / ,

Direct competition for aphid prey (Hemiptera: Aphididae) was evaluated between and among several lady beetle species (Coleoptera: Coccinellidae). The behavior of three native (Coccinella trifasciata, Coleomegilla maculata, and Hippodamia convergens) and four nonnative (Coccinella septempunctata, Harmonia axyridis, Hippodamia variegata, and Propylea quatuordecimpunctata) lady beetles was observed in laboratory arenas. The beetles were kept alone, paired with conspecifics or paired

Leppanen, C., A. Alyokhin, and S. Gross. 2012. Competition for aphid prey between different lady beetle species in a laboratory arena. Psyche: A Journal of Entomology 2012: Article ID 890327, 9 pp. Read More »

Alyokhin, A., F. A. Drummond, G. Sewell, and R. H. Storch. 2011. Differential effects of weather and natural enemies on coexisting aphid populations. Environmental Entomology 40: 570-580.

Abundance Factors /

Study of mechanisms responsible for regulating populations of living organisms is essential for a better comprehension of the structure of biological communities and evolutionary forces in nature. Aphids (Hemiptera: Sternorrhyncha) comprise a large and economically important group of phytophagous insects distributed worldwide. Previous studies determined that density dependent mechanisms play an important role in regulating

Alyokhin, A., F. A. Drummond, G. Sewell, and R. H. Storch. 2011. Differential effects of weather and natural enemies on coexisting aphid populations. Environmental Entomology 40: 570-580. Read More »

Lamb, R. J., P. A. MacKay, and A. Alyokhin. 2011. Population variability and persistence of three aphid pests of potatoes over 60 years. Canadian Entomologist 143: 91-101.

Abundance Factors /

Abundance, persistence, and variability of populations of Macrosiphum euphorbiae (Thomas), Myzus persicae (Sulzer), and Aphis nasturtii Kaltenbach (Hemiptera: Aphididae) in potato plots for intervals of 58 years (n=1), 29 years (n=2), 19?20 years (n=3), and 9?10 years (n=6) were compared. The abundance of M. euphorbiae showed no trend among decades and varied 2.4-fold, whereas that of M. persicae and A. nasturtii declined and showed 54-fold and 3700-fold

Lamb, R. J., P. A. MacKay, and A. Alyokhin. 2011. Population variability and persistence of three aphid pests of potatoes over 60 years. Canadian Entomologist 143: 91-101. Read More »

Finlayson, C., A. Alyokhin, S. Gross, and E. Porter. 2010. Differential consumption of four aphid species by four lady beetle species. 10pp. Journal of Insect Science 10:31, available online: insectscience.org/10.31.

Abundance Factors / ,

The acceptability of four different aphid species, Macrosiphum albifrons (Essig), Macrosiphum euphorbiae (Thomas), Macrosiphum pseudorosae Patch, and Myzus persicae (Sulzer) (Hemiptera: Aphididae), as prey for four lady beetle species, one native species Coccinella trifasciata L, and three non-native species, Coccinella septempunctata L, Harmonia axyridis Pallas, Propylea quatuordecimpunctata L (Coleoptera: Coccinellidae) were tested in the laboratory. The relative field abundance of adults of the same lady beetle species on host vegetation, Lupinus

Finlayson, C., A. Alyokhin, S. Gross, and E. Porter. 2010. Differential consumption of four aphid species by four lady beetle species. 10pp. Journal of Insect Science 10:31, available online: insectscience.org/10.31. Read More »

Finlayson, C. J., A. V. Alyokhin, and E. W. Porter. 2009. Interactions of native and non-native lady beetle species (Coleoptera: Coccinellidae) with aphid-tending ants in laboratory arenas. Environmental Entomology 38: 846-855.

Abundance Factors /

Interactions between lady beetles and the European fire ant (Myrmica rubra L.) tending potato aphids [Macrosiphum euphorbiae (Thomas)] were compared in the laboratory. Lady beetle species native to North America (Coccinella trifasciata perplexa Mulsant, Coleomegilla maculata lengi Timberlake, Hippodamia convergens Guerin-Meneville) and non-native species of Palearctic origin [Coccinella septempunctata L., Harmonia axyridis (Pallas), Hippodamia variegata (Goeze), Propylea quatuordecimpunctata L.)] were evaluated. Harmonia axyridis consumed a significantly greater number of aphids compared

Finlayson, C. J., A. V. Alyokhin, and E. W. Porter. 2009. Interactions of native and non-native lady beetle species (Coleoptera: Coccinellidae) with aphid-tending ants in laboratory arenas. Environmental Entomology 38: 846-855. Read More »

Finlayson, C. J., K. M. Landry, and A. V. Alyokhin. 2008. Abundance of native and non-native lady beetles (Coleoptera: Coccinellidae) in different habitats in Maine. Annals of the Entomological Society of America 101: 1078-1087.

Abundance Factors /

Several studies suggest the possibility that non-native lady beetles may have replaced native lady beetles in some agricultural habitats. There is relatively little information, however, about lady beetle species composition outside of agricultural habitats. Evans (2004) suggested that native species have retreated to nonagricultural habitats in response to the arrival of non-native lady beetles (habitat

Finlayson, C. J., K. M. Landry, and A. V. Alyokhin. 2008. Abundance of native and non-native lady beetles (Coleoptera: Coccinellidae) in different habitats in Maine. Annals of the Entomological Society of America 101: 1078-1087. Read More »

Narayandas, G. and A. Alyokhin. 2006. Diurnal patterns in host finding by potato aphids, Macrosiphum euphorbiae (Homoptera: Aphididae). Journal of Insect Behavior 19: 347-356.

Abundance Factors /

Potato aphid, Macrosiphum euphorbiae (Homoptera: Aphididae), is an abundant potato pest and vector of potato leaf-roll virus and potato virus Y in Maine and other potato growing areas. We investigated the circadian rhythmicity of its movement towards host plant odor. Effects of daily cycle (day or night) and illumination (light or dark) on the proportion of aphids

Narayandas, G. and A. Alyokhin. 2006. Diurnal patterns in host finding by potato aphids, Macrosiphum euphorbiae (Homoptera: Aphididae). Journal of Insect Behavior 19: 347-356. Read More »

Narayandas, G. and A. Alyokhin. 2006. Interplant movement of potato aphid (Homoptera: Aphididae) in response to environmental stimuli. Environmental Entomology 35: 733-739.

Abundance Factors, Viruses /

Potato aphid, Macrosiphum euphorbiae (Thomas), is a highly mobile aphid species that dominates aphid communities in Maine potato fields and may contribute to virus transmission between potato plants. We studied effects of simulated rain, wind, mechanical raking, fungicide application, reflective mulch, and predator (lady beetle, Harmonia axyridis (Pallast) on the interplant movement of wingless adult potato aphids in greenhouse

Narayandas, G. and A. Alyokhin. 2006. Interplant movement of potato aphid (Homoptera: Aphididae) in response to environmental stimuli. Environmental Entomology 35: 733-739. Read More »