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Soybean seed treatment: how do fungicides translocate in plants?
Author(s) -
Fadel Sartori Felipe,
Floriano Pimpinato Rodrigo,
Tornisielo Valdemar L,
Dieminger Engroff Thaise,
Souza JaccoudFilho David,
Menten José O,
Dorrance Anne E,
DouradoNeto Durval
Publication year - 2020
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.5771
Subject(s) - fungicide , carbendazim , agronomy , biology , metalaxyl , seed treatment , horticulture , pesticide , germination
Abstract BACKGROUND Soybean seed treatment with fungicides is a well‐established disease management strategy. However, the movement of these fungicides within seedlings is not always well characterized. Thus, the objectives of this study were to determine the pattern of translocation of three fungicides with different modes of action applied as a seed treatment, and the effect of soil type on translocation. RESULTS Most of the absorbed radioactivity was concentrated in the cotyledons and the maximum sum of the rates of absorption by roots, stems, and leaves of the plants was 15%. In most cases, absorption by roots, stems, and leaves were lower than 5% for 14 C‐pyraclostrobin and 14 C‐metalaxyl, and 1.6% for 14 C‐carbendazim. Fungicides absorbed by the roots and the whole seedlings were higher when plants were grown in soil with lower organic matter content. Fungicides in the cotyledons are unlikely to be redistributed and are lost when cotyledons fall off the plants. CONCLUSION Cotyledons are the part of the plant where fungicides are most absorbed, regardless of the fungicide. Soil type affects the absorption of fungicides, and in this study it was most likely caused by soil organic matter. These data improve knowledge of the movement of seed treatment fungicides in soybean seedlings and may help the development of seed treatment chemistry to manage seed and soilborne pathogens.