Journal of Applied Entomology (2014) 138, 273-280

J. Havelka, M. Zurovcová, S. Rychly and P. Stary (2014)
Russian wheat aphid, Diuraphis noxia in the Czech Republic - cause of the significant population decrease
Journal of Applied Entomology 138 (4), 273-280
Abstract: Diuraphis noxia is a newly established alien pest in the Czech Republic. There were two population explosions during the period 1993-2012. A successful overwintering of the anholocyclic populations of D. noxia was the cause of a population explosion in the oncoming growth season. Viviparous parthenogenetic females of the anholocyclic populations and diapausing eggs of holocyclic populations could overwinter at the same time. Analysis of the course of winter temperatures showed that a complete winter mortality of anholocyclic populations depended mainly on the duration of the freezing period, when temperature dropped below −5°C, and on the intensity of the frost. We proposed the cumulative effective freeze (in minus degree days) as a key parameter for the aphid anholocyclic population's mortality during overwintering. This parameter equalled −10.1 degree days for relatively warm winter period 2006-2007, whereas in the relatively cold winter period of 2009-2010, this parameter reached −87.1 DD, which caused complete mortality of anholocyclic populations. A cumulative effective freeze could be used for short-time prognosis of D. noxia population explosion.
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Link to article at publishers website
Database assignments for author(s): Jan Havelka, Petr Stary

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Diuraphis noxia		Czech Republic