Resistance of carrots to Alternaria SP., Fusarium SP. and factors influencing it

Abstract

The results of many years of work (2008–2018) in the Moscow region on the identification of genetic sources of resistance in wild species and varieties of the genus Daucus on natural and artificial infectious backgrounds to alternariosis and fusarium wilting are presented. When testing the breeding material for leaf and root diseases after storage, the most valuable breeding samples of sowing carrots were identified: Losinoostrovskaya 13, Marlinka, NIIOKH-336, Fakel, Moscow Winter A-75. Using the example of the medium susceptible variety of carrots Red cored and susceptible Nigel, a high correlation between precipitation, high soil moisture, and the development of Alternaria sp. and Fusarium sp. on different backgrounds. The prevalence of carrot diseases in the south of Russia in the Rostov region was less than in the central part of the RF NPP; in a wetter 2018 compared to 2017, the variety samples in both zones were more stable, except for individual hybrids.