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<p>The Douglas-fir (<i>Pseudotsuga menziesii</i>) is internationally used for forestry purposes. Native to North America, it has been introduced to several areas of the world, including South America, where it is valued for its rapid growth and timber quality. One of its major pests, <i>Megastigmus spermotrophus</i> (Hymenoptera: Megastigmidae) has been described for a major area of Douglas-fir distribution. However, as of this date, no reports of its presence in Central and South America have been made. In this work, we describe the first detection of <i>M. spermotrophus</i> in Argentina, associated to seed orchards in Patagonia. Through X-ray imaging, we found an average infestation rate of 18.7%, which suggests the wasp is already established in the region. We discuss the implications of this finding for Douglas-fir production and propose the emerging need for developing management programs with an emphasis on the local characteristics of the insect-tree dynamics.</p>

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First detection of the Douglas-fir chalcid Megastigmus spermotrophus (Hymenoptera: Megastigmidae) in Patagonia, Argentina

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Mónica Germano,
  • Matías Saihueque ,
  • Marcelo Kun,
  • Martin Kandrachoff ,
  • Guillermina Dalla Salda,
  • Carmelina Silva ,
  • Anne-Sophie Sergent

摘要

The Douglas-fir (Pseudotsuga menziesii) is internationally used for forestry purposes. Native to North America, it has been introduced to several areas of the world, including South America, where it is valued for its rapid growth and timber quality. One of its major pests, Megastigmus spermotrophus (Hymenoptera: Megastigmidae) has been described for a major area of Douglas-fir distribution. However, as of this date, no reports of its presence in Central and South America have been made. In this work, we describe the first detection of M. spermotrophus in Argentina, associated to seed orchards in Patagonia. Through X-ray imaging, we found an average infestation rate of 18.7%, which suggests the wasp is already established in the region. We discuss the implications of this finding for Douglas-fir production and propose the emerging need for developing management programs with an emphasis on the local characteristics of the insect-tree dynamics.