A new and distinct variety of Persea americana tree having a high tolerance under most conditions to Phytophthora cinnamomi when used as a rootstock. The nozzle plate for liquid ejector head includes at least a nozzle hole for ejecting droplets composed of an ejection liquid, wherein the surface energy of an inner wall of the nozzle hole at 25\xb0 C. The hydrogenated block copolymer has a) at least one polymer block A with a primary component that is a vinyl aromatic hydrocarbon monomer unit and b) at least one polymer block B with a primary component that is a hydrogenated butadiene monomer unit.