Emily Follett
Forsker
(+47) 950 05 357
emily.follett@nibio.no
Sted
Ullensvang
Besøksadresse
Ullensvangvegen 1005, 5781 Lofthus
Sammendrag
The positive effects of the commonly used commercial treatments of 1-MCP and CA storage on apple are well known and implemented for a range of cultivars in many countries. However, as both technologies demand investments and require additional annual user costs, the decision of implementation must be taken based on the predicted benefit obtained in the specific conditions. The main cultivar in volume in Norway, ‘Red Aroma’, commonly has a main sale period from about two to maximum eight weeks after harvest, in part due to market preferences. However, without additional treatments, the cultivar is often unmarketable after eight weeks due to a combination of firmness loss regardless of storage temperature and soft scald development, with further impacts of variation in ripening at harvest and decay development during storage. Possible improvement in shelf-life quality of fruit stored for about eight to 10 weeks either in CA, or in combination with 1-MCP, were explored through a holistic perspective in industrial scale experiments. Differences in effects of the treatments on multiple commercial deliveries, between seasons, packinghouses, and varying fruit sizes were found. Possible reasons for these differences as well as opportunities for improvements at the packinghouse level will be discussed.
Forfattere
Jorunn Børve Theresa Weigl Emily Follett Ingunn Øvsthus H. Larsen Torbjørn Haukås E. Indergård S.F. Remberg Dalphy Ondine Camira Harteveld Arne StensvandSammendrag
Evaluating the effect of different treatments after a simulated shelf life is common in postharvest industry experiments. As fungal fruit decay development is closely linked to preharvest factors, fruit quality, and postharvest treatments two other time points were added in recent experiments. When commercial packinghouses graded the different experimental units (from 1 to 4 bins) they made three different samples; 1) all the fruit manually discarded before size grading (mostly external symptoms of fungal fruit decay and physiological disorders), 2) a 100-fruit sample of the fruit not regarded as first class by the grading machine at size grading (fruit that could be used for industry purpose, processing fruit), and 3) packed fruit for shelf life testing. As expected, differences in pathogen presence were found varying with storage time, cultivar, season, treatments, etc., but overall, some important factors could be pointed at: up to 70% of the processing fruit had damages (caused by insects, weather or mechanical damage) that could be an entry point of fungal pathogens in storage. Apple scab was found on up to 60% of that fruit and up to 12% of the graded fruit in shelf-life tests, indicating a less effective fungicide strategy in some of the commercial orchards. The additional knowledge gained by having three sample types in the experiments is discussed.
Sammendrag
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