Published in Scientific Papers. Series A. Agronomy, Vol. LXV, Issue 1
Written by Katya VASILEVA, Silviya VASILEVA, Milena KOSTOVA, Todorka SREBCHEVA
Worldwide, net blotch caused by Pyrenophora teres Drechsler is a major foliar disease of barley (Hordeum vulgare L.) causing economic losses by reducing the yield and grain quality. Two forms P. teres f. maculata and P. teres f. teres have been identified as similar morphologically, however, different at the genetic and pathophysiological levels. The aim of the current study is to monitor the distribution of barley net blotch in Bulgaria. The total surveyed area during the investigation is 5212 dka. The lowest prevalence of the disease is in the regions of Imrenchevo and Chirpan, respectively 14.35% and 15.2%. The manifestation of net blotch is strongest in the region of Kamburovo - 82.2%. Based on the studied samples from different regions the species D. teres predominates in Bulgaria, while D. maculata is much rarer. The conidia of D. teres are light brown, cylindrical, with 3 to 8 partitions and dimensions - 69.5-181 x 15.28-24.1μm. The conidia of D. maculata are oblong-cylindrical with 3 to 5 partitions and with dimensions - 65-143 x 10.2-19.3 μm.
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