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Apple fruitlet thinning of cultivar Empire with NAA, carbaryl, and ethephon applied separately, in mixtures, and with SADH

Alina Basak*, Bogusława Niezborała**

**Research Institute of Pomology and Floriculture
**Pomologiczna 18, 96-100 Skierniewice, Poland
**Field Station of Research Institute of Pomology and Floriculture
**Sinołęka, 08-122 Bojmie, Poland

Young, three- to seven-year old apple trees of cv. Empire, were sprayed with NAA, carbaryl, and ethephon, separately or in mixtures or additionally with SADH, with the aim of regulating fruiting of the trees and increase fruit size.

The best results were obtained with carbaryl. The chemical caused little fruitlet thinning and an insignificant decrease in yield during the period of experiment. However, it increased the average fruit size. Ethephon appeared useless on every young trees, while on 5-7-year old trees it increased average fruit size but to a smaller degree than the other chemicals. NAA applied separately or in a mixture with ethephon in general increased fruit size, but frequently the thinning was too strong and the yield reduced. The mixture of ethephon with SADH often increased the total yield and apple size. The chemical can, however, induce abundant fruitlet drop.

Basak A., Niezborała B., 1991. Apple fruitlet thinning of cultivar Empire with NAA, carbaryl, and ethephon applied separately, in mixtures, and with SADH. Folia Horticulturae III/2: 89-101.