A simple interline sunflower hybrid Gorstar

A simple interline sunflower hybrid Gorstar was developed by a method of hybridization with a maternal line ED 45 differed with high combining ability and a paternal line ED 155 tolerant to highly virulent races of broomrape and downy mildew. Vegetative period of the hybrid is 92-96 days in environments of the Rostov region. Plant height is 165-175 cm. it is resistant to lodging, has good head inclination, and is characterized with drought resistance. Potential yield of the hybrid is 3.7-4.3 t per ha. The competitive trials (2015-2017) showed the new hybrid exceeded the standard one Revansh by 0.17 t per ha and was not inferior to the best foreign hybrid Bella (by Euralis company) on this trait. The general distinguish trait of the hybrid is tolerance to a complex of highly virulent broomrape races (Е, F, G) and downy mildew races (330, 710, 730). We examined hybrid plants at the all stages of the breeding process (nurseries of preliminary studying - two years, of competitive trials - three years, annually in fields infected with broomrape seeds and in autumn-winter period in green houses)...