Aggressiveness of Sclerotinia sclerotiorum isolates to Phaseolus vulgaris and Helianthus annuus
Keranka Zhecheva • Ivan Kiryakov
Dobrudzha Agricultural Institute – General Toshevo, 9521, General Toshevo, Bulgaria
Резюме
Under greenhouse conditions, the aggressiveness of 23 Sclerotinia sclerotiorum
isolates to the common bean variety GTB Blyan and sunflower hybrid Deveda
was studied. The straw method was used for inoculation of plants in 2nd trifoliate
of common bean and 3rd pair of sunflower leaves. A three-day culture on PDA
was used for inoculum of each isolate. The area under the disease progress curve
(AUDPC) for each of the crops was calculated, as well as the average AUDPC
(AAUDPC) for each isolate. ANOVA was used to establish the significance of
the differences between the values of AUDPC. Sixteen of the 23 S. sclerotiorum
isolates have higher AUDPC values at the sunflower hybrid Deveda compared to
the common bean variety GTB Blyan. AUDPC values of 5 isolates are higher in
the GTB Blyan variety, and the differences compared to the Deveda hybrid are significant. Two of the isolates showed similar aggressiveness concerning the two
crops, with differences in AUDPC values not significant. Significant variation in
the aggressiveness of the isolates was found both in the same field and between the
different origins.