A pesticide formulation with an enhanced rain fastness performance property including (a) a pesticide composition； and (b) a latex binder adjuvant； wherein the latex binder adjuvant has a Tg value in the range of from about −30° C. to about 55° C.； wherein the latex binder adjuvant can be used in a dosage in the range of from about 2 weight percent to about 5 weight percent in the pesticide formulation to increase the rain fastness performance property of the pesticide formulation； and wherein the rain fastness performance property of the pesticide formulation can be in the range of from about 5 percent to about 90 percent； and a process for preparing the above pesticide formulation.
