Catalyzes the addition of fucose in alpha 1-3 linkage to GalNAc-beta-1->4-GlcNAc-beta-1->3-Gal-beta-1->4-Glc (LDNT)acceptor. Unlike fut-1, does not add fucose to Man-alpha-1->3-(Man-alpha-1->6)-Man-beta-1->4-GlcNAc-beta-1->4-GlcNAc-beta-1-Asn (M3), Man-alpha-1->3-(Man-alpha-1->6)-Man-beta-1->4-GlcNAc-beta-1->4-(Fuc-alpha-1->6)-GlcNAc-beta-1-Asn (M3F6) or GlcNAc-beta-1->2-Man-alpha-1->3-(GlcNAc-beta-1->2-Man-alpha-1->6)-Man-beta-1-4-GlcNAc-beta-1->4-(Fuc-alpha-1->6)-GlcNAc-beta-1-Asn (GnM3F6) acceptors. a beta-D-galactosyl-(1->3)-N-acetyl-beta-D-glucosaminyl derivative + GDP-beta-L-fucose = a beta-D-galactosyl-(1->3)-[alpha-L-fucosyl-(1->4)]-N-acetyl-beta-D-glucosaminyl derivative + GDP + H(+) Inhibited by Cu(2+) and Ni(2+), and to a lesser extent by EDTA, Mn(2+) and Mg(2+). Optimum temperature is 23 degrees Celsius. Vey low activity at 37 degrees Celsius. Protein modification; protein glycosylation. Expressed in larvae and adult. N-glycosylated. Belongs to the glycosyltransferase 10 family.