Articles
Efficacy of chemical and biological nematicides for the management of stem and bulb nematode, Ditylenchus dipsaci, in garlic
Article number
1398_2
Pages
7 – 12
Language
English
Abstract
The stem and bulb nematode (Ditylenchus dipsaci (Kuhn 1857) Filipjev 1936) is one of the most destructive pests of garlic in Ontario, Canada.
Two conventional nematicides, fluopyram and abamectin, were evaluated and compared to a commercial formulation of thyme oil for control of D. dipsaci in garlic (Allium sativum L.). The trials were conducted over three garlic growing seasons (October-July) between 2018 and 2021 in Southern Ontario.
In 2018/19 and 2020/21 the trials were conducted in loam soil using seed cloves with a low infestation of 6-18 D. dipsaci per gram of clove.
In 2019/20 the trial was conducted in high organic matter (muck) soil infested with 30 D. dipsaci per kilogram of soil using nematode free seed cloves.
All products were applied as a seed clove soak prior to planting and fluopyram was also applied as an in-furrow drench.
Efficacy was assessed as emergence, survival, height, symptoms of nematode damage and yield.
Incidence and severity of symptoms of D. dipsaci on garlic, and populations of the nematode in cloves and soil, were assessed at harvest.
There was high nematode damage on untreated infested seed cloves grown in D. dipsaci infested and nematode free soil (44.1-90.6%). Fluopyram was the most effective product against D. dipsaci in both soil types.
Fluopyram applied as a drench or a seed soak significantly reduced damage caused D. dipsaci and resulted in higher marketable yields.
Abamectin seed soak treatments provided good control in 2018/19 and 2020/21 but was not effective in 2019/20. The biological nematicide thyme oil reduced disease severity in one of three years, but was not as effective as the fluopyram soak treatments.
This research has assisted in the recent registration of fluopyram (Velum Prime) for use on garlic in Canada.
Two conventional nematicides, fluopyram and abamectin, were evaluated and compared to a commercial formulation of thyme oil for control of D. dipsaci in garlic (Allium sativum L.). The trials were conducted over three garlic growing seasons (October-July) between 2018 and 2021 in Southern Ontario.
In 2018/19 and 2020/21 the trials were conducted in loam soil using seed cloves with a low infestation of 6-18 D. dipsaci per gram of clove.
In 2019/20 the trial was conducted in high organic matter (muck) soil infested with 30 D. dipsaci per kilogram of soil using nematode free seed cloves.
All products were applied as a seed clove soak prior to planting and fluopyram was also applied as an in-furrow drench.
Efficacy was assessed as emergence, survival, height, symptoms of nematode damage and yield.
Incidence and severity of symptoms of D. dipsaci on garlic, and populations of the nematode in cloves and soil, were assessed at harvest.
There was high nematode damage on untreated infested seed cloves grown in D. dipsaci infested and nematode free soil (44.1-90.6%). Fluopyram was the most effective product against D. dipsaci in both soil types.
Fluopyram applied as a drench or a seed soak significantly reduced damage caused D. dipsaci and resulted in higher marketable yields.
Abamectin seed soak treatments provided good control in 2018/19 and 2020/21 but was not effective in 2019/20. The biological nematicide thyme oil reduced disease severity in one of three years, but was not as effective as the fluopyram soak treatments.
This research has assisted in the recent registration of fluopyram (Velum Prime) for use on garlic in Canada.
Publication
Authors
T. Blauel, K. Vander Kooi, K.S. Jordan, M.R. McDonald
Keywords
abamectin, thyme oil, fluopyram, Allium sativum, seed clove treatment
Groups involved
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