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Open Access Publications from the University of California

Further Studies on the Effects of Greening on Juice Quality: Do Nutritional Sprays Ameliorate HLB-Induced Off-flavor?

  • Author(s): Plotto, Anne
  • Dea, Sharon
  • Bai, Jinhe
  • Manthey, John
  • Nunes, Cecilia N.
  • Narciso, Jan
  • Irey, Mike
  • Baldwin, Liz
  • et al.
Creative Commons 'BY' version 4.0 license

Citrus groves receiving nutritional sprays were compared with groves in the same areas managed with conventional fertilization treatments.  Fruit were harvested from healthy and Huanglongbing (HLB)-affected trees. Within HLB-affected trees, fruit were sorted into asymptomatic (HLB-a) and symptomatic (HLB-s) fruit.  Sensory tests were performed using the difference-from-control (DFC) method, where juice from HLB-affected trees was compared with juice from healthy trees.  Results show that panelists could detect differences between juice from HLB-affected and healthy trees in the 2009-2010 and 2010-2011 seasons, regardless of nutritional treatments, for Hamlin and Valencia. Like in previous years, those differences were perceived as more bitter or metallic for early harvests of HLB-affected Hamlin, but those differences were less and inconsistently perceived as more bitter, sweeter or more sour for late harvests or Valencia HLB-affected fruit. In the 2011-2012 season, there were much less differences between juice from healthy and HLB trees, possibly due to a season with high Brix/TA ratio, or due to later harvests.  Results will be discussed in relation to chemical analysis of sugars, acids, and limonoids.  Nutritional treatments that mitigate HLB symptoms on trees did not have a consistent effect on the HLB induced off-flavor of the fruit and juice, necessitating more seasons of study.

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