![]() Due to constantly changing labels, laws and regulations, the Extension Services can assume no liability for the suggested use of chemicals contained herein. Criticism of products or equipment not listed is neither implied nor intended. The information herein is supplied with the understanding that no discrimination is intended and that listing of commercial products, necessary to this guide, implies no endorsement by the authors or the Extension Services of Nebraska, Colorado, Wyoming or Montana. ![]() Pre-plant incorporated drench or 7” soil band Pre-plant incorporated soil drench or soil band (a 7” band is recommended) Suppression of Pythium and Phytophthora spp. Suppression of Fusarium and Rhizoctonia spp. Product List for Damping-Off and Seedling Blight: Pesticideīroad spectrum, but weak against Pythium spp. Only seed treated with a fungicide should be planted. Crop rotation with non-hosts (i.e., small grains) may provide some reduction in damping-off pathogens, but damping-off and seedling blight pathogens have very broad host ranges and can attack most plants.Ĭhemical controls are most effective when combined with sound cultural practices. Planting into raised beds can help avoid water-logging and promote more rapid germination. Avoid excess irrigation and poor drainage, soil compaction, high herbicide rates, and other factors that delay emergence. Plant high quality seed in warm, well-prepared seedbeds under conditions favorable for rapid seedling emergence shallow planting can encourage rapid emergence. Transplants should be used instead of seed in infested soil. Practice a three-year or longer rotation to non-hosts such as small grains and corn. The efficacy of these products in the High Plains is unknown. Kodiak (Bacillus subtilus) is also registered. Seedlings can be killed, while others may survive and recover as plants develop.ĭeny (Burkholderia cepacia) is registered for protection of roots from Fusarium, Rhizoctonia, and Pythium spp. After several days, plants permanently wilt. Plants can also wilt suddenly and healthy-appearing plants can suddenly collapse during the heat of the day. Root systems of seedlings and transplants are rotted by these fungi or damaged by nematodes. Plants are often infected at the soil line or slightly below. Water-soaked, greasy lesions may also form on hypocotyls and roots after emergence when infected with Pythium spp., causing plants to collapse and wilt. ![]() Radicles and cotyledons may become brown and soft after germination, but fail to emerge. Pre-emergence damping-off results in a brown, gelatinous rotting within the seed coat. Damping-off pathogens are easily disseminated in irrigation water, contaminated soil on equipment, and movement of infected plant materials.ĭamping-off can occur before or after crop emergence. Roots are killed directly or weakened and predisposed to additional damage by other stress factors such as cold, wet soil, compaction, herbicides, and salts from alkaline soil or fertilizer. Pathogens associated with damping-off are common soil inhabitants and can survive in soil as dormant spores and pathogenically on alternate hosts and weeds. Older reports also claim that Rhizoctonia species can be involved.ĭamping-off is associated with cool soil temperatures, excess soil moisture, and delayed seedling emergence. ![]() Death of seedlings before and after emergence can be caused by various species of Pythium and Fusarium. ![]()
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