The effect of preharvest treatment with Pomonit Super 050SL (5% triethanola- mine salt of NAA) alone, and in a mixture with Agrostym 480 SL (48% of ethephon) on 'Auksis' apple fruit abscission and quality was investigated. Trials were conducted on full bearing apple trees grafted on M.9 rootstock at the Lithuanian Institute of Horticulture in 2008-2009. Chemical treatments were applied one week before the predictable optimum harvest date. Fruit drop was measured four times at weekly intervals. Cumulative preharvest drop was assessed by summing the number of fruits shed at each harvest date. The fruit weight, blush colour, flesh firmness, soluble solids content, starch pattern index, and Streif index were monitored during the investigation period. It was found that Pomonit Super 050 SL reduced fruit drop by 67% in comparison with the untreated control. The effectiveness of Pomonit Super 050 SL applied in a mixture with Agrostym 480 SL for managing fruit drop was lower. Nevertheless, fruits in this treatment had more intensive blush but significantly lower firmness and starch content. The mixture of Pomonit Super 050 SL and Agrostym 480 SL determined more intensive fruit ripening processes.
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