Effect of Synthetic Fungicides Used in Conventional Strawberry Growing System on Hirsutella sp., an Entomopathogenic Fungus of Cyclamen Mite

Andréa Duclos, Maxime Delisle-Houde, Joseph Moisan- De Serres, Stéphanie Tellier, Valérie Fournier and Russell J. Tweddell ()
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Andréa Duclos: Département de Phytologie, Université Laval, Québec, QC G1V 0A6, Canada
Maxime Delisle-Houde: Département de Phytologie, Université Laval, Québec, QC G1V 0A6, Canada
Joseph Moisan- De Serres: Laboratoire d’Expertise et de Diagnostic en Phytoprotection du MAPAQ, Québec, QC G1P 3W8, Canada
Stéphanie Tellier: Ministère de l’Agriculture, des Pêcheries et de l’Alimentation du Québec, Direction Territoriale de la Capitale-Nationale, de la Chaudière-Appalaches et de la Côte-Nord, Québec, QC G1N 3Y7, Canada
Valérie Fournier: Département de Phytologie, Université Laval, Québec, QC G1V 0A6, Canada
Russell J. Tweddell: Département de Phytologie, Université Laval, Québec, QC G1V 0A6, Canada

Agriculture, 2025, vol. 15, issue 7, 1-11

Abstract: The study investigated the effect of 17 synthetic fungicides used in strawberry fields in Québec (Canada) on the in vitro growth of Hirsutella sp., an entomopathogenic fungus. Isolates collected from cyclamen mites from farms with a conventional growing system ( Hirsutella sp. H94 and Hirsutella nodulosa H98) and from a farm with an organic growing system ( H. nodulosa H0) were selected for the study. All the fungicides tested strongly inhibited the mycelial growth of the three isolates, although slight differences in sensitivity were observed. Fullback ® 125 SC (A.I.: flutriafol), Mettle ® 125 ME (A.I.: tetraconazole), Nova TM (A.I.: myclobutanil), and Quadris top ® (A.I.: azoxystrobin and difenoconazole) were the most effective at inhibiting the growth of the three isolates. Property ® 300SC (A.I.: pyriofenone) was the fungicide with the lowest inhibiting effect on the growth of the three isolates. Isolates H94 and H98 obtained from farms with a conventional growing system, and thus frequently exposed to synthetic fungicides, did not show resistance to the fungicides tested. The study suggests that fungicides might negatively impact the natural populations of the entomopathogenic fungi of the genus Hirsutella on strawberry plants.

Keywords: Ophiocordycipitaceae; Phytonemus pallidus; biocontrol; entomopathogenic fungi (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2025
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