Graduate Thesis Or Dissertation
 

Delay of anthesis in 'Bartlett' and 'Bosc' pears (Pyrus communis) by evaporative cooling

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  • The influence of evaporative cooling for delay of 'Bartlett' and 'Bosc' fruit bud development for frost avoidance was investigated. Two mist systems, one in a mature pear orchard and the other in a young pear hedgerow, delayed 'Bartlett' and 'Bosc' bloom up to 15 and 8 days respectively. A low pressure sprinkler system delayed 'Bartlett' bloom 14 days and 'Bosc' bloom 8 days. Bloom delay resulted in increased set, seed count, and fruit growth rates. Return bloom was reduced in the mature orchard 'Bartlett' mist and 'Bosc' sprinkler plots in 1976 and this resulted in reduced cropping the following year. Fruit sizes were reduced 6% for 'Bartlett' and 12% for 'Bosc' while harvest maturity was delayed 0 to 6 days and 2 to 7 days respectively. Soluble solids were lowered in the misted hedgerow. Titratable acid was not affected by the bud development delay. Foliar N levels were reduced in the water treated plots. Pear psylla activity was delayed by misting while fire blight produced 36 strikes in 1976.
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