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Abstract
ABSTRACT
Objective: To evaluate the sensitivity of B. cinerea isolated from raspberry to nine fungicides alone and in combination with potassium silicate.
Design/methodology/approach: The sensitivity of four isolates was evaluated to nine fungicides alone and combined with potassium silicate, obtained from four raspberry plantations in October 2022, which were identified as B.cinerea based on morphological, morphometric and molecular characteristics, in a previous study. In PDA culture medium modified with fungicides plus potassium silicate, B. cinerea was planted, mycelial growth and mycelial growth inhibition percentage (PICM) were evaluated. A completely randomized design with six repetitions and two controls was used, an ANOVA and a Tukey mean comparison test were performed.
Results: B. cinerea isolated from CITAP showed lower growth with fluazi-nam (PICM = 100 ), while azoxystrobin presented a PICM equal to 0 , B. cinerea isolated from Paso del Cristo and Sierra Negra 2 had lower growth with fluazinam (PICM = 100), while boscalid and azoxystrobin showed a PICM equal to 0, in Sierra Negra 1 iprodione controlled B. cinerea better with a PICM equal to 100, while azoxystrobin showed a PICM equal to 0, all the isolates were sensitive when fungicides were combined with potassium silicate.
Findings/conclusions: All the isolates were sensitive to the fungicides fluazinam, fenhexamid, thiophanate methyl, captan, pyrimethanil, fludioxonil and iprodione. The isolates from Sierra Negra 1 and CITAP were sensitive to boscalid, while Sierra Negra 2 and Paso del Cristo were insensitive, 100 % of the isolates were insensitive to azoxystrobin which suggests that they could be resistant, potassium silicate potentiates the effect of fungicides.
Keywords: potassium silicate, isolates, mycelial growth, PICM