Secreted arabinofuranosidase that causes degradation of rice cell wall components during infection. Required for virulence. Hydrolysis of terminal non-reducing alpha-L-arabinofuranoside residues in alpha-L-arabinosides. kcat is 0.9148 sec(-1) with p-nitrophenyl-alpha-1-arabinofuranoside as substrate. Glycan metabolism; L-arabinan degradation. Secreted during fungal infection into the apoplastic space of host plant (PubMed:23159799, PubMed:27764242). Only accumulates in rice leaves during compatible fungal infection (PubMed:27764242). Organized into two domains: an N-terminal catalytic domain and a C-terminal arabinose-binding domain (ABD). Significantly reduces vegetative growth and conidiation, but no difference in germination and appressorium formation compared to wild-type. Significantly reduces virulence. Belongs to the glycosyl hydrolase 43 family.