IDEAS home Printed from https://ideas.repec.org/a/ibn/jasjnl/v13y2024i6p100.html
   My bibliography  Save this article

Directional Selection of Phakopsora pachyrhizi Towards Site-Specific Fungicides in Mato Grosso State

Author

Listed:
  • Erlei Melo Reis
  • Laércio Zambolin
  • Wanderlei Dias Guerra

Abstract

This review focus on the sensitivity reduction of Phakopsora pachyrhizi to site specific fungicides in the Brazilian state of Mato Grosso.The soybean grown area in this state in the 2018/19 growing season was 9,756,668 hectares. The main crop disease is Asian soybean rust that depending on disease severity may cause 80% yield reduction. The rust chemical control started in the 2002/003 season with site-specific fungicides applied solo and with 3.6 sprayings/ha/season. For these reasons, the fungus had sensitivity reduction to the fungicides DMIs, QoIs and SDHIs resulting in a short effective life. Anti-resistance strategies were not adopted to prevent or delay the development of soybean rust resistant population to site-specific fungicides. Reduced sensitivity to the target site has been observed for all site-specific fungicides involving cross and multiple resistance resulting in ineffective control. So far, eight mutations in Phakopsora pachyrhizi have been identified conferring reduced sensitivity to DMIs, QoIs and SDHIs but so far specific mutations are not considered in chemical control. The directional selection has occurred and has been aggravated season-after-season by the continuous use of site-specific fungicides in a large area, for 18 season and with more than three sprayings/area/season. The presence of soybean weed in one million hectares of cotton crop infected by rust aggravates the directional selection. Anti-resistance strategies should include sowing at the beginning of the recommended season, avoid the December season and replacing it by February, use of scientific criteria to time the first application and the use of multisite fungicides in all applications and in the entire area cultivated with soybean.

Suggested Citation

  • Erlei Melo Reis & Laércio Zambolin & Wanderlei Dias Guerra, 2024. "Directional Selection of Phakopsora pachyrhizi Towards Site-Specific Fungicides in Mato Grosso State," Journal of Agricultural Science, Canadian Center of Science and Education, vol. 13(6), pages 100-100, April.
  • Handle: RePEc:ibn:jasjnl:v:13:y:2024:i:6:p:100
    as

    Download full text from publisher

    File URL: https://ccsenet.org/journal/index.php/jas/article/download/0/0/45295/48045
    Download Restriction: no

    File URL: https://ccsenet.org/journal/index.php/jas/article/view/0/45295
    Download Restriction: no
    ---><---

    References listed on IDEAS

    as
    1. Laércio Zambolim & Ana Claudia R. Mochko & Douglas Ferreira Parreira & Samuel Vasconcelos Valadares, 2019. "Potassium Fertilization Reduces the Severity of Asian Soybean Rust Under High Disease Pressure," Journal of Agricultural Science, Canadian Center of Science and Education, vol. 11(11), pages 116-116, July.
    Full references (including those not matched with items on IDEAS)

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.

      More about this item

      JEL classification:

      • R00 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - General - - - General
      • Z0 - Other Special Topics - - General

      Statistics

      Access and download statistics

      Corrections

      All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:ibn:jasjnl:v:13:y:2024:i:6:p:100. See general information about how to correct material in RePEc.

      If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

      If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

      If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

      For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Canadian Center of Science and Education (email available below). General contact details of provider: https://edirc.repec.org/data/cepflch.html .

      Please note that corrections may take a couple of weeks to filter through the various RePEc services.

      IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.