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Frost Damage on Ginseng Damage has shown up in many ginseng gardens following the frost on Sunday and Monday. Gardens that appeared to escape undamaged immediately after the frost, began to show signs of injury a few days later. In many gardens the damage is confined to the field edges. More damage can also be found in low areas of gardens. Kinking of the stems is the primary symptom in 2-, 3- and 4-year old gardens (Figure 1). It is still too early to determine how many of these injured plants could still recover. In many cases the developing flower heads have also been affected. Damage to seedling stems has resulted in wilting and browning of the tops (Figure 2). Seedlings are unlikely to recover from this damage. However, some seedlings continue to emerge through the straw and were protected from any injury. It is very important to protect damaged plant material from disease at this time to prevent further losses, and to reduce the chances of disease spreading into unaffected areas of the garden. Alternaria and Botrytis are the biggest concerns on damaged plant material. Consult Publication 610 for recommended chemical controls. It is important to rotate between registered products for optimal control of both diseases. Frost damage could also mask foliar Phytophthora symptoms, which continue to show up in many ginseng growing areas. Closely exam gardens to ensure that you know the cause of foliar symptoms. When damaged by Phytophthora, leaves tend to droop and have a water-soaked appearance. Frost damage causes kinking of stems and can cause the whole top to fall over onto the straw. Ensure timely application of fungicides to maximize protection from Phytophthora root rot and leaf blight. | Top of Page |
Figure 1. Frost damage to 3-year old plants.
Figure 2. Frost damage to seedlings. Growing Forward: Food Safety and Traceability Program Information Session Date: Tuesday, June 9, 2009 Funding is available to help producers and processors adopt food-safety and traceability programs and practices on the farm. Ginseng growers interested in applying at the $20,000 level should attend this information session. Growers applying at the $5,000 level do not need to attend. Please bring your food-safety questions to the session. | Top of Page |
**REGISTRATION IS REQUIRED. Space is limited and organizers need to know how many growers are attending to determine if a second session will be necessary. Call the Agricultural Information Contact Centre at 1-877-424-1300 to register. This workshop will discuss what we are finding this spring in ginseng gardens and how to deal with pest pressures this season SIMCOE RESEARCH STATION AUDITORIUM NO CHARGE! Bring samples with you for diagnosis and discussion. To register, contact the Agricultural Information Contact Centre at 1-877-424-1300. Questions about ginseng can be directed to Sean Westerveld, OMAFRA’s Ginseng and Medicinal Herbs Specialist at 519-426-4323; E-mail: sean.westerveld@ontario.ca. | Top of Page | |
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