Due to the ever more demanding market , special attention is given to improving the quality of grapes and it will achieve the proper and timely application of various agro-technical operations on the vine and orchard . Through various viticultural operations such as pruning vines , the most influence on the yield and quality of grapes . There are two different ways of pruning vines and pruning ( carried out in the winter ) , and a cut in the green ( carried out in the summer ) . Cut the green covers several operations , but in particular we are interested in the impact of the removal of dewclaws on the varieties Pinot Gris . The experiment was set in the vineyards on the site Virovitica Pine , the cultivar Pinot Gris which accompanied the development of the grapes on the vines where the dewclaws removed and where the vines are removed dewclaws . Dewclaws are eliminated on several occasions because they develop on a shoot in proportion to the growth of the shoots . When the grapes are ripe , harvest was carried out and samples were collected over which the analysis of samples . The parameters measured were: sugar content in the must of grapes harvested , total acidity of grapes harvested , actual acidity and weight of the harvested grapes harvested grapes . Our results showed that there was a highly significant difference in sugar content , total acidity and weight of the harvested grapes , while the actual acidity of no significant differences . For those parameters where is founded highly significant differences between treatments , the difference is resulted in the fact that in the treatment where they eliminated dewclaws sugar content and total acidity are lower than in treatments where dewclaws are eliminated , while the mass of grapes in the treatment where they are eliminated is dewclaws higher than in treatments where dewclaws are lefted . However, the results may not reflect the general trend since it is a one-year study, and it would be better for the conclusion of the research that study should be conducted at multiple locations and ina a few years which would provide more relevant results.