Response of vetch varieties to Sitona lineatus L. in organic farming
2016
Nikolova, Ivelina Mitkova
Sitona lineatus L. (Coleoptera: Curculionidae) is an important pest of field vetch in Bulgaria. The response of vetch varieties to S. lineatus was determined on the basis of seedling vigour, plant phenological development and chemical analysis of the feed. The susceptibility to attack by S. lineatus of the vetch, Vicia sativa L., varieties, Liya, Loryna, Villena, Moldavskaya 82 and Vicia villosa Roth varieties, Violeta and Viola, was tested. Vetch varieties with high vitality and rapidly growing seedlings such as Liya and Loryna were considerably less preferred by S. lineatus . They were distinguished with low damage degree and leaf damage intensity. Weather conditions during the years affected population density and food activity of Sitona weevils as the harm was particularly great in the dry spring in 2013, when the plants had suppressed growth and did not develop normally. The least preferred variety with a low S. lineatus density was Liya followed by Loryna, which were characterized with the shortest vegetative season (67 days), high seedling vigour and high fibre content. The most preferred varieties with the highest density of weevils were winter varieties Violeta and Viola, which had high crude protein content.
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