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Development of the black bean aphid (Aphis fabae Scop.) on red beets in relation to the chemical composition of the leaves

Irena Łuczak*, Maria Gawęda**

**Department of Plant Protection
**Institute of Vegetables and Ornamental Plants
**Faculty of Horticulture, Agricultural University
**29 Listopada 54, 31-425 Kraków, Poland

The development of Aphis fabae on 3 red beet cultivars was investigated in relation to the chemical composition of the leaves (content of sugars and nitrogen compounds). The most succesful development of the pest was found on the cultivar Okrągły Ciemnoczerwony. The leaves of this cultivar contained the highest percentage of sucrose in total sugars, a large share of protein nitrogen in total N, and the highest proteins:sugars ratio. On plants of the cultivars Egipski and Czerwona Kula, which were characterized by a higher content of sugars (especially reducing ones) and nitrogen compounds, the development of this aphid was much less intense.

Łuczak I., Gawęda M., 1991. Development of the black bean aphid (Aphis fabae Scop.) on red beets in relation to the chemical composition of the leaves. Folia Horticulturae III/3: 39-48.