Abstract

The main objective of this study was to estimate the efectivity of chemical and hand thinning. In the first naftalenacetic Acid (ANA) at 5, 10 and 15 ppm; 400, 800 and 1200 ppm Sevin and Bionex (adherent) 1 ml/l of water were realized 20 days after of full flowering from 18 April 1995 forward. The hand thinning was carried out one month later leaving one fruit per shoot. This work was conducted in Arteaga, Coahuila at 2200 masl. Fifteen years old apple trees variety Golden delicious with uniform vigor were selected. Distance between plants and rows was 6 x 8 m approximately. A complete randomized block design with nine treatments and ten replications was utilized. Where a single apple tree was considered a experimental plot. The ANOVA and LSD (DMS) showed that the percentage of thinning for treatments was highly significative (p<0.01), this difference was due to the control. The fruit thinning was effective in every treatment, however the wasting of time and money in the chemical method was smaller than in hand thinning. Thinning was most effective when was applied sevin 400 ppm and NAA 15 ppm at all stages. Apparently, the quality of fruit was not affected by the treatments.