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• W2903489573 abstract "Grey mould is caused by at least two species of the genus Botrytis, Botrytis cinerea and Botrytis pseudocinerea, and is the main post-harvest kiwifruit disease in Chile. The commercial strategy promoted by the Chilean Kiwifruit Committee in recent years considers extension of the export period to avoid exceeding demand. This strategy means stocking a large volume of fruits for a long period; this increases the risk of losses due to decay. The aim of this research was to analyse the Botrytis spp. populations from kiwifruits, related to fungicide sensitivity and frequencies of Botrytis species, in order to design specific control strategies, also considering adjustments of a qualitative method that allows the early prediction of grey mould in long-term cold storage of kiwifruit batches and hence assists in segregation. It was tested over three seasons, from six different orchards of Chile's Central Valley. A total of 10 isolates from orchard and season were tested for fungicide sensitivity (fludioxonil, iprodione and fenhexamid) through mycelial growth testing and later EC50 calculation. In general terms, the isolates showed high to moderate levels of sensitivity to the tested fungicides. The same isolates were analysed through a qPCR-HRM technique to identify the species, using polymorphism detection on one nucleotide located in the 1090 Bc-hch gene. Absolute dominance of B. cinerea was recorded in every studied case. Predictive methodology consisted of the sowing of sepals and receptacles of fruits, sampled 100 days after full bloom, in Petri dishes containing potato dextrose agar amended with a minimal dose of captan, and recording the incidence of Botrytis colonization. Receptacle colonization frequencies during the three studied seasons were a better predictor of grey mould decay frequencies, after 90 days of storage at 0°C and modified atmosphere, than those collected from sepals (R2≥0.72 and ≥0.56, respectively). In conclusion, the studied Botrytis populations have not been selected for the tested activities and they are not under B. pseudocinerea dominance, which is a fenhexamid-resistant species, allowing its extended use in field control. Furthermore, our predictive technique through receptacle colonization identification might prove to be a powerful tool to generate minimal-risk long-term cold storage." @default.
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• W2903489573 date "2018-11-01" @default.
• W2903489573 modified "2023-09-27" @default.
• W2903489573 title "Characterization of Botrytis spp. from Chilean kiwifruit populations and pre-harvest prediction of risk of grey mould in long-term storage" @default.
• W2903489573 doi "https://doi.org/10.17660/actahortic.2018.1218.46" @default.
• W2903489573 hasPublicationYear "2018" @default.
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