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Pestic Biochem Physiol. 2018 May;147:96-101. doi: 10.1016/j.pestbp.2018.03.009. Epub 2018 Mar 27.

Pseudoperonospora cubensis in China: Its sensitivity to and control by oxathiapiprolin.

Author information

1
Department of Plant Pathology, China Agricultural University, Beijing 100193, PR China.
2
Institute of Plant Protection, Fujian Academy of Agricultural Sciences, Fujian 350003, PR China.
3
Department of Plant Pathology, China Agricultural University, Beijing 100193, PR China. Electronic address: pengfeiliu@cau.edu.cn.
4
Department of Plant Pathology, China Agricultural University, Beijing 100193, PR China. Electronic address: seedling@cau.edu.cn.

Abstract

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 × 10-4 μg 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.

KEYWORDS:

Baseline sensitivity; Oxathiapiprolin; PscORP1; Pseudoperonospora cubensis; Systemic translocation

PMID:
29933999
DOI:
10.1016/j.pestbp.2018.03.009
[Indexed for MEDLINE]

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