This paper outlines the following three conditions for shifting to reduced pesticide cultivation (RPC) in Japanese Agricultural cooperatives (JAs) of Miyazaki prefecture. The first condition is that the average ratio of certified area depends on widespread establishment of RPC techniques. Second, JAs with relatively small numbers of producers show high tendency to shift to RPC completely. This depends on 1) the bargaining power of joint selling, 2) the difficulty in unifying members' opinions, 3) the collecting and shipping facilities, and 4) the burden of certification in JA. Third, in the case of the mini-tomato, the economic condition of participation, especially for marginal producers, is satisfied not by premium but by improvement of their skills.
