Pears (Rosaceae, Pomoideae, Pyrus) are commercially important fruits in the world, including Korea. In Korea, it represents the fifth most-grown fruit crop, after apples, persimmons, citrus fruits, grapes (Statistics Korea, 2016). Like apples, pears are self-incompatible crop and must be pollinated by different genotypes (i.e., pollinizers) for fruit set (Cho et al., 2007; RDA, 2016), and their entomophilous flowers require insect pollinators to transfer pollen (Free, 1993). However, the majority of Korean pear cultivators grow cultivars, like 'Niitaka' because of consumers preference and contributing about 81.5% of the total pear cultivation area in Korea, thereby resulting in a paucity of pollinizers. On the other hand, the combination of environmental pollution and pesticide overuse has drastically
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