_____________________________________________________________________________________________________ *Corresponding author: E-mail: parmindersingh05911@gmail.com; Journal of Experimental Agriculture International 24(4): 1-6, 2018; Article no.JEAI.41852 ISSN: 2457-0591 (Past name: American Journal of Experimental Agriculture, Past ISSN: 2231-0606) Role of Pre-harvest Application of Paclobutrazol and Ethephon on Fruit Quality of Winter Guava cv. Sardar Parminder Singh 1* and Gurpinder Kaur 1 1 Department of Agriculture, Khalsa College, Amritsar, India. Authors’ contributions This work was carried out in collaboration between both the authors. Author PS designed the study, wrote the protocol, wrote the first draft of manuscript, managed the analyses of the study and managed the literature searches. Author GK performed the statistical analysis. Both the authors read and approved the final manuscript. Article Information DOI: 10.9734/JEAI/2018/41852 Editor(s): (1) Dr. Lanzhuang Chen, Professor, Laboratory of Plant Biotechnology, Faculty of Environment and Horticulture, Minami Kyushu University, Miyazaki, Japan. Reviewers: (1) George D. Nanos, University of Thessaly, Greece. (2) Rosendo Balois Morales, Universidad Autonoma de Nayarit, Mexico. (3) Venkata Satish Kuchi, Dr. YSR Horticultural University, India. (4) Elizabeth Orika Ono, São Paulo State University, Brazil. Complete Peer review History: http://www.sciencedomain.org/review-history/25434 Received 16 th April 2018 Accepted 27 th June 2018 Published 6 th July 2018 ABSTRACT The investigation on the role of pre-harvest application of paclobutrazol and ethephon on fruit quality of winter guava cv. Sardar was conducted in the well-maintained guava orchard of Department of Agriculture, Khalsa College, Amritsar during 2016-2017. The experiment comprised of seven pre- harvest treatments viz. Paclobutrazol @ 250 ppm, 500 ppm, 750 ppm, Ethephon @ 250 ppm, 500 ppm, 750 ppm and control. The experiment was laid out in Randomized Block Design (RBD) with three replications. Results of the study revealed that marked variations were recorded among the pre-harvest treatments on physicochemical characters of guava. Among all treatments, paclobutrazol 750 ppm treated fruits showed maximum fruit size (6.62 cm × 6.40 cm), fruit weight (155.43 g), pulp content (87.4 %) and fruit yield (37.85 kg/plant). Whereas, the fruit bio- chemical characters were improved significantly with the use of ethephon 750 ppm (T 6 ). Maximum TSS (10.75%), total sugars (7.89%), reducing sugars (5.86%) and ascorbic acid content (194.27 Original Research Article