Journal of Food, Agriculture and Environment

Susceptibility of 20 cabbage genotypes to flea beetles attack under field conditions 

Author(s):

Damir Markovič, Tanja Bohinc, Stanislav Trdan *

Recieved Date: 2014-02-06, Accepted Date: 2014-04-09

Abstract:

In our two-year field experiment (2010-2011), we studied the extent of damage done by flea beetles (Phyllotreta spp.) on 20 different genotypes of cabbage. We established that the extent of damage differed among the genotypes. The first feeding tracks on leaves were detected in the end of May, while the highest average extent of damage was recorded in the first half of July. The early, the mid-early and the mid-late genotypes of cabbage manifested the highest extent of damage in the second decade of July in both years of the experiment. The economic threshold (10% of damaged leaf surface) was in the first year of the experiment in the early genotypes exceeded for the first time in the second decade of June, while it was in both years exceeded for the second time in all groups of genotypes in the second decade of July, when the next-generation beetles in the research area usually emerged. In the beginning of July, the average daily temperatures were the highest, which further increased the numbers of beetles. Our study proves that the extent of damage on cabbage leaves caused by flea beetles increases up to the second decade of July, then it decreases to some extent due to a sharp decrease in the number of flea beetles. We have found out that in early growth stages hybrids of cabbage are more susceptible to attacks by flea beetles than varieties, and that the selection of a cabbage genotype is of great importance in environmentally acceptable systems of production of the vegetable, while this agrotechnical measure combined with other alternative methods can in future become even more important.

Keywords:

Antixenosis, cabbage flea beetles, cabbage, Phyllotreta spp

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Journal: Journal of Food, Agriculture and Environment
Year: 2014
Volume: 12
Issue: 2
Category: Environment
Pages: 1356-1361

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