Volume 19 Part 1 Article 16
Title: Evaluation of Metrafenone against Verticillium and Cladobotryum spp. – Causal Agents of Dry Bubble and Cobweb Disease
Author: Nancy Pyck, Patrick Sedeyn, Mia Demeulemeester and Helen Grogan
The continuously decreasing number of pesticides that are allowed in mushroom cultivation highlights the need to further develop novel fungicides in this sector. For this purpose the efficacy of metrafenone against the fungal mushroom pathogens Verticillium fungicola var. fungicola and Cladobotryum mycophilum was evaluated. To obtain good level of disease optimum, inoculation rates of several Verticillium and Cladobotryum spp. strains, together with optimal time of inoculation, were specified in pilot trials. Next, experimental cropping experiments were conducted under controlled conditions to evaluate the control of both fungal pathogens using metrafenone and prochloraz-manganese, the commercially relatively widely available fungicide. Experiments were carried out according standard practices on mushroom farms and each disease trial was executed in duplicate. Different application treatments for metrafenone were evaluated, together with different treatments and doses of prochloraz-manganese. Cropping experiments showed promising disease control of metrafenone against cobweb and dry bubble disease. Residue analyses indicated that metrafenone residue levels in harvested mushrooms were conform the MRL values.