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Humic and fulvic acids against boxwood blight disease caused by Calonectria pseudonaviculata
Author(s) -
Samavat Samaneh,
Samavat Saeed,
Wyka Stephen A.
Publication year - 2020
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.12583
Subject(s) - compost , biology , fungicide , blight , fungus , horticulture , germination , botany , agronomy
The most recent outbreaks of boxwood blight caused by Calonectria pseudonaviculata , in Hyrcanian forests of Iran, have sparked the need for research to identify eco‐friendly fungicides for management purposes. Our study was conducted to test the efficacy of humic substances against C. pseudonaviculata under both in vitro and in vivo conditions. For this purpose, humic acids (HA) and fulvic acids (FA) extracted from tea waste compost (HAT & FAT), sawdust compost (HAW & FAW) and manure compost (HAM & FAM) were tested against hyphal growth and conidial germination of C. pseudonaviculata . In addition, EC 50 and MIC 50 were determined for all humic substances tested. While none of the substances caused complete inhibition of the fungus, they showed a range of antifungal activities. Based on the high inhibitory efficacy and low related EC 50 and MIC 50 , HAT and FAT provided the highest efficacy against the pathogen. In the greenhouse, curative and protective effects of the humic treatments at 2,000 mg/L were also investigated against disease severity. Of the substances tested, FAW and FAM showed the weakest antifungal effects and HAT had the greatest curative and protective effects. These results indicate that HAT application can be used as an eco‐friendly control method for boxwood blight epidemics in the disease hotspots of Hyrcanian forests.