After 20 d of seedling, Five gravid female adults of A. swirskii were introduced to each seedling. The number of predatory mites (eggs, immature and adults) was counted under a stereoscope by weekly samplings. When the emerging population
peaking, the number of A. swirskii on all leaves, flowers and twigs per potted plant per variety were counted by destructively sampling. The experiments were three replicates.