A Comparison of Insect Pest Colonization on White Cabbage Cultivars

Abstract

The experiments were carried out in 2002 and 2003. Twenty-two cv. of white cabbage were sown in 2002 and eighteen cv. of white cabbage were sown in 2003. In both years, observations were done and the occurrence of the cabbage aphid Brevicoryne brassicae L., small white butterfly Pieris rapae L., large white butterfly P. brassicae L., diamondback moth Plutella xylostella L. and cabbage moth Mamestra brassicae L. were determined. The results show that the lowest number of aphids was noted on cv. Hurricana and Vestri and also the development of aphids on these cultivars was very weak. The results from 2003 show that the cultivar most preferred by cab- bage aphids was Lenox. The diamondback moth P. xylostella L., small white butterfly P. rapae L., large white butterfly P. brassicae L., and cabbage moth M. brassicae L. were not very numerous in either year, although a higher number was noted in 2002. The highest number of caterpillars and pupae of diamond moth were observed on cv. Hurricana, Kalorama and Bartolo. In the year of the most intensive occurrence, the eggs of the white butterfly P. rapae L were the most numerous on cv. Lenox and the least numerous on cv. Balaton and Kamienna Glowa. Egg clusters of the large white butterfly P. brassicae L. and cabbage moth M. brassicae L. were mainly noted in 2002, and then only on some cultivars. The greatest number of eggs clusters of P. brassicae was observed on cultivars Masada and Sitton, and of M. brassicae on cultivars Kronos and Langendijker.