경기도 8개 지역에서 2010년부터 2012년 동안 식균성인 노랑무당벌레의 발생기주를 조사한 결과, 흰가루병에 감염된 12종의 식물에서 관찰 이 되었다. 특히 가장 밀도가 높았던 배과원에서 노랑무당벌레는 7월 상순부터 11월 상순까지 발견되었다. 식균성인 노랑무당벌레의 장내에서는 흰가루병 균사나 포자 외에 다른 먹이의 흔적이 발견되지 않았고, 알과 번데기를 제외한 전 발육단계에서 균을 섭식하는 특성을 볼 때 절대적 식균성 곤충으로 생각된다. 25℃에서 오이 흰가루병균을 섭식한 노랑무당벌레의 발육기간은 알, 유충, 번데기, 성충이 각각 3.9, 10.4, 4.1, 37.7일 이었고, 발육단계별 오이 흰가루병 섭식량은 45.6, 144.4, 372.2, 628.1, 473.7 mm 2로 4령, 성충, 3령, 2령, 1령 순으로 많았다. 본 연구를 통해 노랑무당벌 레의 오이 흰가루병에 대한 섭식능력을 바탕으로 향후 유용 토착천적으로써 대량사육기술, 저독성 약제 선발 등 작물 흰가루병 종합방제기술(IPM) 에 대한 연구가 필요하리라 사료된다.

Although the greater part of Coccinellidae are all pure entomophagous insects (Weber and Lundgren, 2009), many species of phytophagous, mycophagous and polyphagous ladybirds have been reported in worldwide. This study was conducted to investigate the morphological characteristics of mouthparts of mycophagous ladybird, I. koebelei, comparison with aphidophagous species, Propylea japonica (Coccinellidae: Coccidellini), and developmental charicteristics of I. koebelei at different temperature under incubation conditions. Four species of powdery mildews that I. koebelei fed were observed, and their host plants were pear tree, persimmon tree, red pepper and cucumber. The most conspicuous elements of I. koebelei mouthparts is the mandible. The distal incisor region of the mandible of both species is formed by two teeth, giving them a bifid apex. and the terminal teeth spilt near top and the ventral tooth is smaller than the dorsal one. but the ventral tooth of I. koebelei divided into a row of additional teeth was different with P. japonica. Furthermore, while the inner mandibular cutting edge of P. japonica is smooth, that of I. koebelei is covered in minute teeth, forming a comb. These structures are presumed to help I. koebelei rake fungal spores growing on leaf surface. The developmental period and reproduction ability of were significantly different according to temperature conditions when I. koebelei was fed the powdery mildew from cucumber leaves. The optimum temperature for I. koebelei rearing was from 23 to 25℃ that is the similar condition of cucumber powdery mildew occurrence.