Integrated control of potato late blight with a combination of the photosynthetic bacterium Rhodopseudomonas palustris s
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Integrated control of potato late blight with a combination of the photosynthetic bacterium Rhodopseudomonas palustris strain GJ-22 and fungicides Xin Zhang . Xiaonian Li . Yu Zhang . Yue Chen . Xinqiu Tan . Pin Su . Deyong Zhang . Yong Liu
Received: 15 October 2019 / Accepted: 26 May 2020 Ó International Organization for Biological Control (IOBC) 2020
Abstract Late blight caused by the oomycete Phytophthora infestans is the major yield-threatening disease in potato production. An isolate of the photosynthetic bacterium Rhodopseudomonas palustris, GJ-22, was previously evaluated for its ability to promote the growth and enhance the immune response of solanaceous plants. In the present study, GJ-22 was shown to significantly repress disease symptom development caused by P. infestans in potato tubers. Curzate (cymoxanil plus mancozeb), a widely used fungicide with high activity against P. infestans, was selected for use in combination with GJ-22. The sensitivity of GJ-22 to the fungicides cymoxanil and
mancozeb was tested. The growth of GJ-22 was unaffected by up to 100 mg l-1 cymoxanil or 50 mg l-1 mancozeb in photosynthetic medium. In greenhouse and field experiments, the combined application of GJ-22 and curzate resulted in better disease control than the use of either agent alone. In addition, treatment with 1 9 107 CFU ml-1 GJ-22 plus 700 mg l-1 curzate showed synergistic effects in the field trial. Our results highlight the potential to control potato late blight with the combination of R. palustris strain GJ-22 and curzate, providing environmentally friendly protection with a reduced level of fungicide application.
Handling Editor: Jane Debode
Keywords Potato late blight Rhodopseudomonas palustris Curzate Integrated pest management Combined application
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10526-020-10026-x) contains supplementary material, which is available to authorized users.
Introduction X. Zhang X. Li Y. Zhang Y. Chen X. Tan P. Su D. Zhang (&) Y. Liu (&) Hunan Plant Protection Institute, Hunan Academy of Agricultural Sciences, Changsha 410125, China e-mail: [email protected] Y. Liu e-mail: [email protected] X. Zhang e-mail: [email protected] Y. Zhang e-mail: [email protected]
Potato (Solanum tuberosum L.) is the world’s number one non-grain food commodity (FAO 2012). Late blight caused by the oomycete Phytophthora infestans is considered the most important disease of potato and greatly increases the difficulty of growing this crop (Fry 2008). In 1845 and 1846, potato crop failures contributed to an estimated 750,000 hunger-associated deaths in Europe, which has been well documented as the Irish famine (Zadoks 2008). Even today, the
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impact of this disease cannot be ignored because it is still capable of destroying entire fields of its hosts, causing to up to 100% yield losses (Nowicki et al. 2012). Contaminations typically originate from airborne sporan
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