Premium
In‐vitro antifungal activity of several biorational fungicides against Calonectria pseudonaviculata, the causal agent of Buxus hyrcana blight
Author(s) -
Yoldashkhan Ali,
Samavat Samaneh,
Zamanizadeh Hamidreza
Publication year - 2018
Publication title -
forest pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.535
H-Index - 49
eISSN - 1439-0329
pISSN - 1437-4781
DOI - 10.1111/efp.12442
Subject(s) - fungicide , biology , mycelium , germination , blight , horticulture , ammonium , botany , growth inhibition , in vitro , chemistry , biochemistry , organic chemistry
Abstract In recent years, the outbreak of box blight disease caused by Calonectria pseudonaviculata in Caspian Hyrcanian forests of Iran makes it necessary to find both efficient and environmentally friendly compounds as possible alternatives to currently available fungicides. Seven biorational compounds were tested for inhibitory activities against mycelial growth and conidial germination of C. pseudonaviculata Cy‐08 under in‐vitro conditions. Potassium sorbate and salicylic acid as organic compounds and copper ( II ) sulphate and zinc sulphate as inorganic compounds completely inhibited both mycelial growth and conidial germination of Cy‐08 at 25 mM, comparable with the commercial fungicide, tebuconazole. Ammonium phosphate and boric acid were moderately inhibitory at 25 and 50 mM, also showing fungistatic effects at 100 mM. Ammonium sulphate had the weakest antifungal activity at all tested concentrations. The tested compounds altered the pH of the growing medium (with readings ranging from pH 4.2 to 7.85) but there was no correlation between pH of the amended media and inhibition of fungal growth. C. pseudonaviculata grew in both acidic and alkaline conditions, with mycelial growth decreasing at both lower (4‐5) and higher (11‐12) pH values. The antifungal activity of all tested chemicals was pH ‐independent. Therefore, it can be concluded that the more active of these compounds may be used as part of an integrated management program for the control of boxwood blight in forest settings.