무농약 시설재배 오이에서 잎, 꽃 및 과실을 가해하던 응애를 채집하여 동정한 결과 오이긴털가루응애(Tyrophagus neiswanderi)로 동정되었 다. 오이긴털가루응애는 분류학상 응애목(Acarina) 가루응애과(Astigmata)에 속하며 형태적으로는 유백색의 계란형을 띄고 체장은 490.1㎛, 체 폭은 288.1㎛의 매우 작은 응애이다. 오이긴털가루응애는 잎, 꽃, 과실에 모두 발생하여 피해를 주었다. 피해증상은 정식 초기 유묘의 경우 신초가 수축되면서 연노란색으로 탈색이 되고, 심하면 신초가 멎는 피해가 나타난다. 또한 오이가 생육을 하는 과정에서 잎이 피해를 받으면 처음에는 오이 잎에 흰색의 반점이 나타나고 시간이 경과함에 따라 반점에 구멍이 나고 찢어진다. 꽃에서도 흰색 반점과 찢어지는 증상이 나타난다. 과실에서는 어린 과실일 때 피해를 받으면 과실의 비대가 저해되거나 기형과가 나타나며, 과실이 비대하더라도 코르크증상으로 인해 상품성이 떨어지게 된다.

Damages by Tyrophagus spp. (Acari: Acaridae) on horticultural crops were newly observed in recent years especially in organic culture greenhouses in Korea. The crops damaged by the mite species were Spinacia oleracea L. (spinach), Cucumis sativus (cucumber), and Phalaenopsis schilleriana (orchid). The spinach inner leaf growth was halted affected by the feeding of Tyrophagus similis at the early stage of the shoot emergence. The young leaves of the spinach bud had small holes and the leaves were deformed as they grew up. The surface of young cucumber fruits became shiny and soft at the early damage stage and the damaged surfaces became corky as the plants grew up. The mite from cucumber was identified as Tyrophagus neiswanderi Johnston & Bruce. In phalaenopsis orchid, the flower buds became yellow and dropped and the lower side of the leaves had white spots. The damages were caused by Tyrophagus putrescentiae.

The bulb mite (Rhizoglyphus echinopus) is damage garlic, shallot, onion in the bulbs, corms, tubers. It has recently become a serious problem because of the continuous use of acaricides resulting in resistance among bulb mite population. Thus, there is need to find alternative control measures to suppress bulb mite population. Initial screenings were performed using 352 isolates of pathogenic fungi from Korea soils. As results, 9 strains of acaropathogenic fungi were cadavers of bulb mite supporting fungal conidiation. These isolated were identified as 8 strains of Metarhizium anisopliae (4-1, 4-3-1, 4-3-2, 4-8-1, 4-4-1, 4-14-2, 4-16-1,and 4-31-2), 2 strains of Beauveria bassiana (4-4-2) by microscopic examination and genetic sequencing of the ITS region. However, ITS sequence analysis was consistent with the Metarhizium anisopliae (4-1, 4-3-1, 4-4-1, 4-31-2; a, 4-8-1, 4-14-2, 4-16-1; b, 4-3-2; c). Therefore, genetic diversity of selected in vitro isolates was characterized by Universally Primed (UP) PCR. The divided with Metarhizium anisopliae 4strain by UP-PCR. Of the 5stain isolation tested, 5stain resulted in mortality rates ≥20% within 6 days and all fungal treatment was detected mycosis. Thus these species of acaropathogenic fungi can be considered promising for biological control of bulb mite.

A mite damage was observed in spinach (Spinacia oleracea L.) under organic culture greenhouses. The mite was identified as Tyrophagus similis Volgin, 1949. It was very difficult for the farmers to diagnose the mite damage because of its tiny size about 0.5 nm in length. And the symptom was not clear at the early growth stage of the spinach because the mite mainly attack the very young leaves. In this study, we first report the spinach damages by T. similis in Korea. Informations on the mite morphology and the spinach damage symptoms are provided for the diagnosis.

One of stored food mites, Suidasia medanensis Oudemans, 1924 is first reported form Korea after the stored food surveys in 2008 and 2009. The morphological characteristic is given.