Root-knot nematodes, Meloidogyne spp., are the most important plant-parasitic nematodes, causing severe crop yield loss with an estimated 1000 billion dollars a year worldwide. The nematodes also cause disease complexes with other microbial pathogens, damaging plants more severely than each of the pathogens alone or their sum does and making control efficiencies weakened or nullified in disease complexes. In our study, the synergistic effect of the root-knot nematode Meloidogyne incognita was confirmed in the fusarium wilt of tomato caused by Fusarium oxysporum f. sp. lycopersici, which showed greatly increased wilt symptoms in combined inoculations. Use of antifungal and nematicidal plant growth-promoting rhizobacteria (PGPR) were considered for controlling the disease complex because of its causal agents. Among forty PGPR strains tested, P. polymyxa G508, G462 and P. lentimorbus G158 showed strong antifungal and nematicidal activities against F. oxysporum f. sp. lycopersici and M. incognita second stage juveniles (J2), respectively. The Cultures of these bacterial strains inhibited the nematode egg hatching completely even at 1% diluted concentration. In pot experiments, treatment of the Paenibacillus strains reduced wilt severity of tomato with the control efficacy of about 90% ~ 98%. Their treatment also reduced gall formation by 64% - 88% compared to the untreated control. P. lentimorbus GBR158, which well established on seeds and hypocotyls at high population levels, reduced the disease complex greatly with the control value of about 98% when the tomato seeds were treated with the bacterial strain. Plant growth was also stimulated by the seed treatment of the bacterial strain. Scanning electron microscopy revealed alteration and distortion of hyphal cell walls of F. oxysporum and lysis of M. incognita egg shell by the bacterial treatment, showing direct antifungal and nematicidal action mechanisms. No extensive giant cell formation was observed near nematode in the tomato roots treated with the bacteria, indicating a systemic action mechanism. All of these results suggest that the Paenibacillus strains, especially G158 may have a high potential to be developed as biological agents for controlling the root-knot nematode and the disease complex.

창선충목에 속하는 4 신종 및 2 미기록종을 기술, 도시하였다. Discolaimium gyeongiens n. sp. (경기짤룩창선충)은 체장인 1.6~1.7mm이고, c=37~41, 창침은 19~21이고, 구순부는 넓고, 전직장은 매우 짧은 것이 특징이다. Aporcelaimellus donghwaens n. sp. (동화육각창선충)은 체장이 2.8~2.9mm이고, c=4.0~4.5, 창침은 19~20이고, 창침확장부는 짧고, 식도장간변 판이 있고, 꼬리는 원추형인 것이 특징이다. Labronema korandus n. sp. (코란두수창선충)은 체장이 2.2~2.3mm이고, c=68~81, 창침은 27~28이고, 교접자는 61이고, 구순부는 연속되었고, 음문은 원형이고, 꼬리는 원통형이다. Zalophidera longus n. sp. (둥근순검선충)은 체장이 4.1~4.4mm으로 길고, c=107~130, 구침은 80~93으로 길고, 구침확장부가 큰 것이 특징이다. Discolaimoides bulbiferous (다산넓은창선충)과 Diphtherophora communis(칠곡둥근창선충)은 우리 나라에서는 처음으로 기록되었다.