Comparison of Aphids Trapped on Vertical Sticky Board and Cylindrical Aphid Traps and Correlation with Watermelon Mosaic Virus 2 Incidence1

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Abstract
Sticky board aphid traps of 1290 cm2 and sticky cylindrical traps of 1225 cm2 were equally suitable for quantitative studies of aphid vectors of watermelon mosaic virus 2 (WMV-2). There were no differences between traps in total numbers of aphids or numbers of species caught or in numbers of Aphis spiraecola Patch, the main vector. At peak aphid migration, A. spiraecola comprised 81% of the catch on both traps. Correlations of trapped aphids with mosaic incidence the same week and one week later were both significant, but the correlation of trapped aphids with mosaic incidence 2 wk later was much better. Traps located south and east of a 7.3 ha watermelon field were closer to the area of highest mosaic incidence than north and west traps, but correlations of aphids trapped on boards or cylinders with mosaic incidence were highly significant regardless of trap location.

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