Effects of copper citrate as a defoliant in nursery fruit stock production

Abstract

The effects of copper citrate on defoliation of one year old fruit stocks in a nursery are presented in this paper. The investigation aimed to evaluate the defoliation efficacy of copper citrate as a new formulation, compared with other compounds recommended for that purpose. Field trials were conducted in the region of Trstenik, a center of nursery production in Serbia in 2016 and 2017. Two years of investigation showed that copper citrate could be used as an efficient compound for defoliation in nursery production. A stronger defoliation effect was observed on plum stocks, compared to apple stocks. Better results were achieved with the highest concentration of copper citrate (2%), while the effectiveness decreased with lower concentrations (0.5%, 1.0% and 1.5%). Defoliation degree on nursery apple stocks after treatment with 2.0% concentration of copper citrate varied from 80.6% to 95.6%, while it reached 100% on plum stocks.

Efficacy of copper citrate in grapevine disease control

“…Some copper formulations used to control phytopathogenic fungi in the field can cause phytotoxic effects (Jamar & Lateur, 2007;Kurnik et al 2011;Aleksić et al 2012). According to investigation results reported by Gavrilović et al (2017Gavrilović et al ( , 2018a copper citrate can be used as a defoliant on nursery apple and stone fruit trees.…”