Open Access522 Study on the Effect of GA4+7, GA3, and Dimethoate on Russeting of `Golden Delicious' Apple
Author(s) -
A. Talaie,
J. Mojtahed
Publication year - 1999
Publication title -
hortscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.518
H-Index - 90
eISSN - 2327-9834
pISSN - 0018-5345
DOI - 10.21273/hortsci.34.3.535e
Subject(s) - dimethoate , randomized block design , horticulture , biology , cultivar , petal , botany , agronomy , pesticide
Skin russet in apple fruit, which causes a considerable decrease in marketing and exporting potentials, is one of the major problems in the word fruit markets. In this project, the effect of GA 4+7 , GA 3 , and dimethoate on russeting of `Golden Delicious' apple was examined. A complete randomized-block design with 13 treatments and four replications was used. In all treatments, the trees had the same size and medium growth and were homogeneous. The distances between trees were 6 x 6 m and the age was 18 years. The total number of trees, including controls, was 52. The 12 treatments were GA 4+7 and GA 3 with 10 ppm and 20 ppm concentrations in one and two times of spray in petal fall (PF) and PF + 10 days. Dimethoate at a concentration of 0.03% and 0.05% in one and two times of spray in PF and PF + 10 days. Fruit russeting was reduced in all treatments except with GA 3 . The largest decrease of russeting was caused by GA 4+7 , especially with 20 ppm and also dimethoate with a significant decrease in russeting. Seed number also decreased significantly with GA 4+7 and GA 3 , but dimethoate had no significant effect on TSS, while ACD ratio was decreased significantly by GA 4+7 and dimethoate, but GA 3 had no significant effect. Compared with the control, the treatment did not show differences with the other characteristics.