Cellulose supported bio-heterogeneous polymeric Pd(II) catalyst, stable to air and moisture, was designedand characterized with different spectroscopic techniques including FESEM, TEM, XPS, XRD, ICP-AES andEDX. The Pd(II) catalyst showed high catalytic performance (0.2 to 0.0009 mol%) to the Suzuki-MiyauraCAC cross-coupling reaction of aromatic halides and aryl diazonium salts with a range of organoboronicacids to produce the respective biaryl product in up to 97% yield. Biologically active Boscalid, a fungicidethat effectively inhibits the growth of fungal pathogens like ascomycetes on fruits and plants, could alsobe constructed through using this catalyst. Additionally, it was possible to recover the Pd(II) catalyst fromthe reaction medium and reused it repeatedly without significantly degrading its catalytic efficiency.