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The lowest fl ower in the pear (Pyrus communis L.) cluster usually develops and blooms fi rst and also has a greater sink potential. For this reason, resources are preferentially utilized by the lowest fruit, and this is also one of the reasons why most thinning practices tend to favor their set. However, it is not always possible to perform selective thinning. This study was undertaken to determine if hindering pollination in the most developed fl owers in the cluster infl uences yield or quality compared to that obtained in a whole open-polli- nated cluster. The treatments were made in 'Blanquilla' (Spadona, Agua de Aranjuez) and 'Conference' pear within a wide range of fl ower densities for each cultivar. Pollination was hindered by cutting off the fl ower styles. The factor tested was style removal intensity (SRI). Treatments consisted in removing the styles of two, four(always the most developed), or all fl owers in each cluster. Flower density was used as a covariate in an analysis of covariance to account for differences in fl ower densities in response to SRI treatments. In all experiments the covariate was not signifi cant; therefore, SRI effect was not affected by fl ower density. 'Blanquilla' and 'Conference' had similar responses to treatments, so that when at least three fl owers are susceptible to be openly pollinated, fruit set, seed content, and cluster yield were similar to control clusters, therefore the growth potential of fruit from partially damaged clusters in their most developed fl owers is similar to undamaged open pollinated clusters. The reduced set of parthenocarpic clusters implies yield reductions ranging between 40% and 60% in 'Conference', and up to about 60% in 'Blanquilla'.

Influence of Reproductive Impairment of Most Developed Flowers on Fruit Set and Fruit Quality in Pear