Abstract: A bacteriophage comprising a gene encoding lysozyme fused-type DarB, having genes encoding three lytic enzymes of an endolysin, the DarB and Rz/Rz1, having a gene encoding CsrA, having a gene encoding two different tail fiber proteins and infecting Ralstonia solanacearum, a bacterial wilt disease control agent comprising the bacteriophage as an active component and a bacterial wilt disease control method in a plant comprising administering the agent to a plant or a plant growth medium, for providing a bacteriophage which is effective against a wide variety of Ralstonia solanacearum strains and a bacterial wilt disease control method using such bacteriophage.

Abstract: There is provided a steric net-like fiber aggregation, comprising fibers having a fineness of 150 to 100000 dtex, the fibers being made of a resin comprising a propylene-based polymer(a), wherein a multitude of the fibers are in a fusion bonding with each other due to a random orientation of melted fibers, and wherein the propylene-based polymer(a) has a structural unit of 51 to 95 percent by mole of a propylene and 5 to 49 percent by mole of an ?-olefin with respect to 100 percent by mole of the total monomers of the propylene-based polymer(a).