A storage mite (cheese mite), Tyrophagus putrescentiae, is known as the pest in storing grains and common health pest species in the dust around home. The mite directly affect our well-being as parasites, vectors of disease, and producers of allergens. But recently we found damages in horticultural crops especially in greenhouses. It is very difficult to diagnose the damage by the mite because of the tiny size of the mite. And the symptom is not clear at the beginning stage. In this study, observations were done on the mite and the crop damage symptoms in several horticultural crops under dissecting microscope and scanning electron microscope (SEM). The mite body size was 0.3~0.5㎜ and they had long hairs all around their body when observed under SEM. The characteristic damage symptoms in some horticultural crops are as follows. In phalaenopsis, the flower buds became yellow and the lower side of the leaves had white spots. The surface of young cucumber fruits became shiny and soft at the early damage stage. In the crops, the damaged surfaces became corky as the plants grew up. In peach tree, whole the trees lost vigor and flower drops were observed when the mite density was very high in greenhouse cultivation.

화목류 및 관상수에 기생하는 먼지응애류에 대한 1993년도 조사 중 국내미기록종 Tarsonemus속 4종이 동정되었다. Tarsonemus bilobatus Suski, 1965. T. evodiae Ito, 1964, T. smithi Ewing, 1939, T. takaoensis Ito, 1964 등 4종의 형태적 특징에 대하여 보고한다.

In a survey of mites associated with ornamental trees in 1992 and 1993m five Tarsonemus species unrecorded inKorea were identified. They are Tarsonemus confu년 Ewing, 1939, T. occidentalis Ewing, 1939, T. sasai Ito, 1962, T. scaurus Ewing, 1939, and T. waitei Banks, 1912, Morphological characteristics and host rabges of these species are reported

Xiphinemella속의 1종을 마이산 낙엽송 뿌리주위에서 발견하여 형태적 특징을 검토한 결과 신종으로 기록하였다. Xiphinemella maiensis n. sp.는 체장이 2.5~3.2 mm로 다른 종들에 비해 길어 쉽게 구분되며 구침의 길이는 63~68 , 음문의 위치는 49~50%이다. 같은 속의 X.esseri와 비교하면 음문위치 42~47% 보다는 후부에 위치하고, 구침 길이 72~75 보다 짧은 것으로 구별되며 X. ornata돠 비교하면 체장은 1.94~2.32 보다 길고 구침은 82 ~92 보다 짧은 것으로 구별된다. Xiphinemella속의 각종들에 대한 분별학적 Key 를 만들었다. Xiphinema brevicolle, X. diffusum, X. chambersi, X. insigne등 4종은 우리나라 미기록종으로 밝혀졌다.

A gene flow has been tested from transgenic herbicide-resistant Chinese cabbage to major crops in Cruciferae. Hybridizations were made between transgenic Basta-resistant Chinese cabbage and non-transgenic Chinese cabbage, B. napus, B. juncea and Brassicoraphanus(B. campestris × Raphanus sativus, 2n=4x=38) with honey-bee mediated fertilization. Progeny populations were selected by Basta herbicide. The F1 hybrids with pat gene were again self-pollinated or cross-pollinated with nontransgenic Chinese cabbage and rape naturally or artificially. Pod setting ratio were compared as a tentative parameter for potential gene flow. Key agronomic characters were compared among the F1 hybrid populations obtained. In the days to flowering after cold treatment, the F1 hybrids of Brassicoraphanus x B. campestris and B. napus x B. campestris(GM) were the shortest (75 days), and the GM Chinese cabbage and the F1 hybrid of B. juncea x B. campestris(GM) were 87 and 93 days, respectively. In the stem length, the F1 hybrid of Brassicoraphanus x B. campestris was the longest(175 cm), and followed by the F1 hybrid of B. napus x B. campestris(GM), the F1 hybrid of B. juncea x B. campestris(GM) in order. The naturally occurring pod setting ratios were fluctuated seriously among individual and segregation lines. Natural pod setting of the transgenic Chinese cabbage was 10 to 19 %. The F1 hybrid of B. napus x B. campestris(GM) showed the ratio of 4-11%. However, the F1 hybrids of B. juncea x B. campestris and Brassicoraphanus x B. campestris(GM) did not produced seeds. The F1 hybrids with pat gene were hybridized with nontransgenic Chinese cabbage and rape by artificial bud pollination to test potential gene flow. All cross combinations except Brassicoraphanus produced seeds and the pod setting ratios ranged from 35 to 100 percentages. Thus, the potentials of the gene flow from Chinese cabbage with pat gene to the order specise in the same gene interspecies or intergeneric species and from the F1 hybrids with pat gene to nontransgenic Chinese cabbage and rape were detected. Herbicide resistant test to the acquired seeds by natural and artificial pollinations including honey-bee mediated fertilization using the same materials is going on.