Assessment of ‘hen and chicken’ disorder for marketable yield estimates of table grape using the ‘Berry Analysis Tool’

• K. C. Dahal ^[1] ; S. P. Bhattarai ^[1] ; A. Kicherer ^[2] ; D. R. Oag ; K. B. Walsh ^[1]
  1. [1] Central Queensland University

     Central Queensland University

     Australia

     
  2. [2] Julius Kühn-Instiute
• Localización: Vitis: Journal of Grapevine Research, ISSN 0042-7500, Vol. 57, Nº 1, 2018, págs. 27-34
• Idioma: inglés
• Enlaces
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• Resumen

  • Bunch and berry size are important quality criteria for table grapes, and bunch weight is used in estimation of vine yield. The Berry Analysis Tool (BAT), a machine vision technique, was trialled for use in estimation of berry count, diameter and weight, to support estimates of 'hen and chicken' disorder and vineyard yield. Berries were spread on a plate for imaging. BAT estimates achieved a r2 = 0.99 on berry number per bunch, r2 = 0.98 on average berry minor axis length and r2 = 0.99 on bunch weight. Based on an allometric relationship between linear dimensions and weight, these attributes were used to estimate the proportion of under-size ('chicken') berries per bunch and bunch weight. The estimated bunch weight multiplied by a number of bunches per vine provides an estimation of vine yield. Use of the BAT as a decision support tool in table grape farm management is described.