The study was conducted at the experimental guava orchard in the village Dhindsa, Rajpura road, Patiala, and laboratory of horticulture, Faculty of Agriculture, Sri Guru Granth Sahib World University, Fatehgarh Sahib during the 2023-24 winter season crop. Plant growth regulators were applied to the winter crop. The study was conducted on 5-year-olds of uniform size and vigour guava plants cv. Sardar, spaced at 6 x 5 apart. Orchard is located at 31° 42781" N latitude and 76° 53847"E longitude at an elevation of 269.21 m above mean sea level. The soil structure of the experimental farm is sandy loam to clay loam with a pH ranging from 6.85-7.04. The winter season crop of guava was selected for the study. A modified leader system of training is generally followed on guava plants. The experiment was laid out under a Randomized Block Design with three replications and 10 treatments with 3 replications. Foliar application of plant growth regulators on 3rd week of November 2023 with different concentrations viz. 200, 300ppm, and 400ppm naphthalene acetic acid, 400ppm, 500ppm and 600ppm ethephon and abscisic acid @ 100ppm, 150ppm and 200ppm to know the effect of plant growth regulators on flowering, fruit set, and yield of guava. The maximum number of flowers (14.80) per shoot, highest fruit set per cent (86.48), minimum fruit drop (37.72), and maximum numbers of fruit per shoot at harvest (6.53). yield (33.29 kg/plant) was found with (T1)200 ppm NAA followed by (T4) ethephon @ 400 ppm as compared to (T10) absolute control. The fruits that were harvested from the plants treated with 200ppm NAA were found better sensory ratings, improved flowering behavior, increased fruit set percentage and less incidence of the pre-harvest fruit drop with higher yield of the winter season guava.

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