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The Eurytoma maslovskii conduces the unexpected plum dropping. It stayed overwinter insidethe pits of the dropped plums and able to oviposit on plum surface when the diameter of theplums are over 16 mm prior to endocarp hardening. To control this harmful pests is too muchessential to plum orchard. Therefore, the plum seed crusher (PSC) was designed and developedaccording to the purpose of perishing the pests through destroying the dropped plums. The rocksand the weeds were removed from the plum orchard prior to the test. Manually operated plumseed crusher picked-up the dropped plums from the ground and crushed them. The performanceof PSC was evaluated by applying 2.5 and 3.0 km/h travelling speeds, and controlling the gaps;18, and 28 mm intervals between plum pick-up discs. The test result showed the plum pick-uprate was 98±2.0%, and 92±5.3% with the machine travelling speed of 3.0 km/h in laboratory. Further, it changed to 95±8.7%, and 93±5.8% when the travelling speed was used 2.5 km/h. Inboth cases of test plum pick-up discs were maintained 18 mm, and 28 mm gap intervals,respectively. Furthermore, in field conditions, pursuing to similar gap intervals, the plum pick-uprate was 94±4.0%, and 92±2.0% with the speed of 3.0 km/h albeit it showed 92±4.0%, and90±3.5% when the speed was decreased to 2.5 km/h. The maximum plum pick-up rate wasfound at 18 mm disc intervals with 3.0 km/h travelling speeds. The crushing teeth were selected8 mm in height by repeated test to destroy the plum seeds. The result showed 100% crushingefficiency was facilitated to entire tests at 280 RPM crushing speeds regardless of plum sizesand shapes. This machine is preferred for the farmers to control the damage of plums bypreventing the propagation of the identified pests.

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