Occurrence of black bean aphid (Aphis fabae Scop.) and coccinellid beetles (Coccinellidae) on red beet in relation to coverage of crop by weeds
2003
Pobozniak, M. | Wnuk, A. (Krakow Agricultural University (Poland). Dept. of Plant Protection)
The experiments were carried out on red beet (cv. Czerwona Kula) from 1997 to 2000. Four combinations differing in ground coverage by weeds were analysed. During the whole observation period, the greatest numbers of aphids were noticed on the plots kept weed free, while the lowest numbers of aphids were found on the plots where the weeds were not removed and exceptionally, in 1997, on the plots weeded twice. Over the years of observations, the greatest numbers of larvae and adult of Coccinellidae were found on the plots kept weed free, where the bean aphids were the most numerous. Among the four species of adult coccinellid beetles found in the colonies of black bean aphids, the most dominant was Coccinella septempunctata L.
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