Journal of Economic Entomology (2018) 111, 1751-1759

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Alois Honek, Zdenka Martinkova, Pavel Saska and Anthony F.G. Dixon (2018)
Aphids (Homoptera: Aphididae) on winter wheat: Predicting maximum abundance of Metopolophium dirhodum
Journal of Economic Entomology 111 (4), 1751-1759
Abstract: In Central Europe, the most abundant aphid infesting the leaves of small grain cereals is Metopolophium dirhodum (Walker) (Homoptera: Aphididae). Annual variation in its seasonal dynamics was evaluated using a 25-yr series of standardized weekly censuses of winter wheat plots. M. dirhodum made up >50 % of the aphids on the foliage. Date of immigration (8 May–3 July), length of period of population increase (0–9 wk), and date of attaining maximum abundance (28 May–22 July) varied greatly. For the prediction, we regressed maximum numbers/tiller on numbers recorded in the first week after heading. The regression of maximum abundance on nonzero aphid counts revealed a critical number of >1.50 aphids/tiller, which if exceeded resulted in a harmful maximum abundance of >10 aphids/tiller at the peak. Zero aphid counts resulted in 10% of cases with a harmful maximum abundance. Using this regression for prediction will result in 18% of the recorded cases being false negatives and 9% false positives. Parallel annual variation in the average maximum numbers of M. dirhodum, Sitobion avenae (Fabricius) (Homoptera: Aphididae), and Rhopalosiphum padi (Linné) (Homoptera: Aphididae) indicated the following factors that affected their abundance: temperature in winter and host plant quality. The predictions apply only in areas where M. dirhodum is holocyclic and aphids do not overwinter in wheat stands.
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Database assignments for author(s): Alois Honek, Zdenka Martinkova, Anthony F.G. Dixon, Pavel Saska

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
thresholds/decision-support systems

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Sitobion avenae Wheat (Triticum) Czech Republic
Rhopalosiphum padi Wheat (Triticum) Czech Republic
Metopolophium dirhodum Wheat (Triticum) Czech Republic