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.