Alternate Bearing and Chemical Thinning Applications in Olives

Abstract

In this review, in which the subject of alternance in olives is discussed, the effect of alternance on olive cultivation and the methods of coping with alternans are examined in line with the latest literature. The latest developments in chemical dilution, which is the most effective and most practical among alternative methods of combating alternance, are brought together. Chemical dilution studies on olives conducted in 2021 and before were searched for and presented in this review using various databases. As a result of the literature review, access to 20 scientific research articles directly related to the subject was provided. Because of the alternate bearing discussed in the study, olive production follows a cyclical pattern. Despite the fact that the olive is genetically predisposed to alternate bearing, it can be managed and controlled through horticultural practices; in this regard, chemical fruit thinning is the most commonly used method in olives. NAA, NAAm, Ethephon, Urea and GA3 are among the most preferred chemicals used for chemical dilution in olives. Chemicals used, their doses, application times and many factors related to them affect the success of chemical applications. These factors include the tree’s age, variety, physiological condition and climatic conditions (particularly temperature), full flowering time, and young fruiting period. When we look at the publications on chemical dilution, it is striking that the studies in our country are fewer in number than the studies abroad. This situation can be associated with the fact that there are still some concerns about chemical dilution in our country. The availability of “environmentally friendly” chemicals will be beneficial in reducing these concerns and protecting the environment, and producers will not suffer economically. As a result, there has been an increase in the use of chemicals all over the world in recent years, with an increasing reputation for environmentally friendly chemicals.