Publications by authors named "N Kleczewski"

Article Synopsis
  • Gray leaf spot (GLS) in corn is primarily caused by Cercospora zeae-maydis and C. zeina, with new management involving the fungicide flutriafol (Xyway® LFR®) recently approved for use.
  • A study analyzed 448 isolates of Cercospora spp. collected from corn in the U.S. and Canada, identifying six species, but only C. zeae-maydis caused GLS symptoms on corn, while some species affected soybean instead.
  • Sensitivity tests revealed that C. zeae-maydis is susceptible to flutriafol, with inhibitory concentration values indicating effective management potential for GLS in corn production.
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Tar spot of corn ( L.) is a significant disease in the United States and Canada caused by , an obligate biotroph fungus. However, field research critical for understanding and managing the disease has been hindered by a need for methods to inoculate corn with in field environments.

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As soybean () production continues to expand in the United States and Canada, so do pathogens and pests that directly threaten soybean yield potential and economic returns for farmers. One such pathogen is the soybean cyst nematode (SCN; ). SCN has traditionally been managed using SCN-resistant cultivars and rotation with nonhost crops, but the interaction of SCN with sudden death syndrome (SDS; caused by ) in the field makes management more difficult.

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Plants produce a range of volatile organic compounds (VOCs) that mediate vital ecological interactions between herbivorous insects, their natural enemies, plants, and soil dwelling organisms including arbuscular mycorrhizal fungi (AMF). The composition, quantity, and quality of the emitted VOCs can vary and is influenced by numerous factors such as plant species, variety (cultivar), plant developmental stage, root colonization by soil microbes, as well as the insect developmental stage, and level of specialization of the attacking herbivore. Understanding factors shaping VOC emissions is important and can be leveraged to enhance plant health and pest resistance.

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Article Synopsis
  • Phyllachora maydis is a fungal pathogen responsible for tar spot disease in corn, first identified in the U.S. in 2015.
  • Research has focused on identifying the environmental factors that foster tar spot development, with moderate temperatures (18-23 °C) over longer periods being key to its growth.
  • This study has led to the creation of predictive models using various weather parameters, enhancing the understanding of P. maydis and laying groundwork for anticipating future outbreaks.
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