Suseptability to anthracnose (Gnomonia leptostyla (Fr.) Ces. et de Not.) of walnut cultivars and hybrids, grown in Eastern Rhodopes

Elitsa Blagoeva

Abstract: In Bulgaria anthracnose is a walnut disease that at favorable conditions may cause over 80 % reduction of fruit yield. It is caused by the fungus Gnomonia leptostyla (Fr.) Ces. et de Not. with imperfect form Marssonina juglandis (Lib.) Magn. A number of published data supports the fact that the disease attack depends on the environmental and agroecological conditions of walnut cultivation. The aim of the study was to determine the susceptibility to anthracnose of Bulgarian and American walnut cultivars and genotypes, grown in Eastern Rhodopes. The analysis of 2010 – 2012 data shows that the various cultivars exert different reaction toward the disease. Strong susceptibility was recorded for all hybrids. The American cultivars Tehama, Adams, Hartley, Pedro, Amigo, Midland, UC 61-25, as well as the Bulgarian cultivars Dryanovski, Izvor 10, Proslavski, Kuklenski and Sheynovo were susceptible. The cultivars with late development and lateral bearing as Pedro and Tehama are less susceptible. The cultivars with early development and lateral bearing like Serr or early development and apical bearing like Proslavski and Kuklenski were the most susceptible.

Keywords: anthroacnose; cultivars; Gnomonia leptostyla; Juglans regia; walnut

Date published: 2017-07-12