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

Dahal, K. C.; Bhattarai, S. P.; Kicherer, Anna GND; Oag, D. R.; Walsh, K. B.

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.

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Dahal, K. / Bhattarai, S. / Kicherer, Anna / et al: Assessment of 'hen and chicken' disorder for marketable yield estimates of table grape using the 'Berry Analysis Tool'. 2018.

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