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- W4309715246 abstract "Phytophthora crown rot (PhCR) and leather rot (LR) caused by Phytophthora spp. are major threats to strawberry production worldwide. In the United States, these diseases are mainly caused by Phytophthora cactorum; however, P. nicotianae has also been recently reported causing PhCR. Growers have relied on three different chemical products (i.e., mefenoxam and phosphites for PhCR and LR, and azoxystrobin for LR). Because resistance to mefenoxam and azoxystrobin has been reported, this study aimed to assess the in vitro sensitivity of Phytophthora spp. isolates from strawberry to phosphites and investigate its efficacy on in vivo assays. In vitro sensitivity of P. cactorum (n = 128) and P. nicotianae (n = 24) isolates collected from 1997 to 2018 was assessed for phosphite at 10, 50, 100, 150, and 300 µg/ml. Regardless of the Phytophthora sp. and isolation organ, most of the isolates (75% for P. cactorum and 54.2% for P. nicotianae) had effective concentration that inhibits pathogen growth by 50% (EC 50 ) values ranging from 50 to 100 µg/ml. In vivo tests with strawberry fruit and plants revealed that commercial formulations of phosphite applied at the highest field rate controlled P. cactorum isolates but failed to control PhCR and LR caused by some isolates of P. nicotianae. In this study, EC 50 results from in vitro assay did not truly translate the efficacy of phosphites on controlling LR and PhCR caused by P. cactorum and P. nicotianae. Our findings support the hypothesis that the product acts in a dual way: direct on the pathogen and stimulating the plant immune system. Moreover, this has important implications for disease management, highlighting the importance of a correct diagnosis before phosphite recommendations, because its efficacy varies within Phytophthora spp." @default.
- W4309715246 created "2022-11-29" @default.
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- W4309715246 date "2023-05-01" @default.
- W4309715246 modified "2023-09-23" @default.
- W4309715246 title "Phosphite Is More Effective Against Phytophthora Crown Rot and Leather Rot Caused by <i>Phytophthora cactorum</i> than <i>P. nicotianae</i>" @default.
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- W4309715246 doi "https://doi.org/10.1094/pdis-06-22-1481-re" @default.
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