Journal
PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
Volume 147, Issue -, Pages 96-101Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.pestbp.2018.03.009
Keywords
Oxathiapiprolin; Baseline sensitivity; Pseudoperonospora cubensis; Systemic translocation; PscORP1
Categories
Funding
- National Key R&D Program of China [2016YED0201003]
- National Natural Science Foundation of China [31471791]
- Special Fund for Agroscientific Research in the Public Interest of China [201303023]
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The novel fungicide oxathiapiprolin has potential for the control of downy mildew of cucumber, which is caused by Pseudoperonospora cubensis. In this study, an in vitro bioassay with detached leaves was used to determine the baseline sensitivity to oxathiapiprolin for 77 Ps. cubensis isolates from 11 provinces in China. The baseline sensitivity curve was continuous, and the average EC50 value was 2.23 x 10(-4) mu g ml(-1). In field trials, the control of downy mildew of cucumber was greater with oxathiapiprolin at 20 or 30 g a.i. ha(-1) than with dimethomorph at 262.5 g a.i. ha(-1). Oxathiapiprolin was taken up by cucumber roots and transported upwards to stems and leaves. The full length of PscORP1, the gene that encodes the target protein of oxathiapiprolin in Ps. cubensis, was sequenced for the first time. Our results suggested that oxathiapiprolin will be an excellent alternative fungicide for control of cucumber downy mildew. However, as Ps. cubensis is a high-risk pathogen, resistance development to oxathiapiprolin should be monitored and managed.
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