Category Archives: Ginseng Pest Management

Ginseng Crop Update – Ginseng Leaf Folders are Re-Emerging – July 25, 2025

Posted on July 25, 2025 by Sean Westerveld

Given the more severe outbreaks of leaf folders (Zigzag Herpteogramma – Herpetogramma thestealis) over the past couple of years, we have been tracking their progress over the year to get a better understanding of their life cycle. This week, our … Continue reading →

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Ginseng Crop Update – Dealing with Heat – July 18, 2025

Posted on July 18, 2025 by Sean Westerveld

Although some cooler weather has temporarily arrived, we are currently experiencing a hot stretch that may continue again next week. Many areas have also been very dry, with only 43 mm of rain having fallen at the Delhi Weather Station … Continue reading →

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Ginseng Crop Update – Pests – June 20, 2025

Posted on June 20, 2025 by Sean Westerveld

Alternaria After a prolonged cool and damp (but not wet) period, temperatures are about to rise dramatically. Combined with some frost damage and canopy stunting due to the long, cool period, this will greatly increase the risk of Alternaria leaf … Continue reading →

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Ginseng Crop Update – Frost, Rhizoctonia, and Leaf Folders – May 30, 2025

Posted on May 30, 2025 by Sean Westerveld

Frost In the last crop update, I commented on how much colder the temperatures were at Delhi than the forecast the night before. Since then, there have been several nights with temperatures several degrees Celsius colder at Delhi than at … Continue reading →

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Spotting Rhizoctonia at Home: A Quick and Easy Test for Ginseng Growers

Posted on May 30, 2025 by Sean Westerveld

By: Amy Shi, Research Associate, Ontario Ginseng Growers Association Rhizoctonia is showing up in ginseng gardens. The symptoms of Rhizoctonia crown rot in ginseng include expanding circles (up to 1 m in diameter) of collapsing tops that often arch over … Continue reading →

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Ginseng Crop Update – Dealing with Frost and Leaf Folders – May 15, 2025

Posted on May 15, 2025 by Sean Westerveld

Frost Risk Once again, a cold snap at the end of the long weekend and into next week could bring the risk of frost to frost-prone areas. As of May 15, none of the forecasts show freezing conditions, and dewpoints … Continue reading →

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