RELАTIONSHIP BETWEEN PОPULATION DENSITIES OF Globodera rostochiensis AND YIELD OF PОTATO CULTIVARS UNDER FIELD CONDITIONS IN BULGARIA

• Main Authors: H. Samaliev, E. Nacheva, O. Baicheva
• Format: Article
• Language: Russian
• Published: Federal Scientific Centre VIEV 2016-05-01
• Series: Российский паразитологический журнал
• Subjects: potato cyst nematode, solanum tuberosum l., pathogenicity, potato, globodera rostochiensis, tolerance limit, yield losses
• Online Access: https://vniigis.elpub.ru/jour/article/view/99

In 2010–2011, in field conditions (Smolyan potato growing region) microplots experiment have been carried out to determine the effect of population densities of Globodera rostochiensis pathotyp 3 (Ro3) on the growth and yield of two new Bulgarian potato (Solanium tuberosum L.) varieties Evridika and Orfei. Microplots were 25 cm-diam, 30 cm-deep, filled with 10 L of soil infested with G. rostochiensis in a geometric series of nematode densities between 0 and 64 eggs/mL of soil. Eight weeks after planting in infested soil, the relative plant height of varieties Evridika and Orfei was reduced at Pi ≥ 1 and 32 eggs/mL soil, respectively. In both potato varieties the minimum possible relative values for plant height were 0,51 and 1,0, respectively, at Pi = 64 eggs/mL soil. The tolerance limits of potato yield of Evri-dika and Orfei were 2 and 16 eggs/mL soil, respectively. The minimum possible relative values for yield of Evridika and Orfei were 0,325 kg/plant and 0,659 kg/plant, respec-tively, at Pi = 64 eggs/mL soil. A mathematical model describing the influence of Pi of G. rostochiensis and yield of both varieties can be used in expert advisory systems when accounting for the environmental factors.