The differences in the content of green (chlorophyll a + b) and yellow-orange (carotenoids) pigments in the leaves of 7 cultivars of spinach (Spinacia oleracea L.) and New Zealand spinach (Tetragona expansa Murr.) and their effect on black bean aphid (Aphis fabae Scop.) invasion were investigated in 2007 and 2008. In both years, the largest numbers of total aphids and colonies were observed on the cultivar Olbrzym Zimowy, whereas, the fewest ones – on Tetragona expansa. The high percentages of plants infested by total aphids and winged migrants, and the largest numbers of winged aphids were found on two cultivars: Matador and Markiza. The cultivar Matador was characterised by the highest yellow-orange pigments content in leaves and the highest ratio of these pigments to green ones. In both years, on the cultivar Spiros F1, small numbers of aphids and small percentages of infested plants were observed. The cultivar Spiros F1 was characterized by the lowest content of pigments (chlorophyll a + b, carotenoids) in leaves. The influence of yellow-orange pigments on the A. fabae invasion was confirmed by the statistically significant and positive correlation coefficients between the carotenoids to chlorophyll (a + b) ratio and the number of winged aphids and colonies, and also the percentages of infested plants by total aphids and winged migrants.
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