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Zakaullah Khan,Park, So-Deuk Korean Society of Applied Entomology 1999 Journal of Asia-Pacific Entomology Vol.2 No.2
Application of Microcoleus vaginatus, a blue-green alga(Cyanobacterium) at different levels along with Meloidogyne incognigta, second state larvae, in the rhizosphere of tomato plants; showed that the plant growth as well as yield of tomato were increased and gall formations and nematode populations decreased with the increase in inoculum level of M.vaginatus. An inoculum level of 20 ml endospores suspension of M. vaginatus (2.4$\times$ $10^6$ endospores per mol) per plant was optimum to reduce nematode attack with a population density of 1000 larvae per kg soil. Plant growth and yield of fruits were greatly suppressed and gall formations on roots, and nematode populations in soil were increased when M. incognita larvae five days prior to M. vaginatus inoculation. On the other hand, when . vaginatus inoculated ten days before nematode inoculation, suppressive effect of M. incognta on plants was reduced and their population density as well as gall formations were also decreased significantly. The efficacy of simultaneous inoculation of both nematode and M. vaginatus was lied in between two treatments discussed above.
Zakaullah Khan,Park, So Deuk Korean Society of Applied Entomology 1999 Journal of Asia-Pacific Entomology Vol.2 No.1
Soil samples collected from Taebak Changkunbong and Undal mountains of Kyungbuk Province, yield two new species of the order Dorylaimida which are described and illustrated below. Dorylaimoides punctatus n. sp. (Nematoda: Dorylaimida) is 1.2-1.4 mm long; b=5.9-6.9; c=14.6-17.7; odontostyle 7.3-8.5 $\mu\textrm{m}$; spicules 33.5-36.5 $\mu\textrm{m}$; ventromedan supplements 5-6 and is characterized by having zig-zag lines on body cuticle, continuous lip region, elongate conoid tail and comes close to Dorylaimoides micoletzkyi(De Man, 1921) Thorne & Swanger, 1936 and Dorylaimoides leptus Husain & Khan, 1968. Paractinolaimus acutus n. sp. (Nematoda: Dorylaimida) is 2.1-2.4 mm long; b=4.3-4.9; c=10-12; odontostyle 25-27 $\mu\textrm{m}$ and characterized by having continuous lip region, longitudinally oval vulva and long filiform tail with acute tip and comes close to Parctinolaimus aruprus Khan et al., 1994 and Parctinolaimus baldus Thorne, 1967.
Three New Species of Predatory Namatodes (Dorylaimida: Actinolaimoidea) from Korea
Zakaullah Khan,Park, So-Deuk,Choi, Young-Eoun Korean Society of Applied Entomology 1999 Journal of Asia-Pacific Entomology Vol.2 No.1
Three new specie of predatory nematodes belonging to family Actinolaimidae, superfamily Actinolaimoidea, order Dorylaimida are described and illustrated. Westindicus sanaensis sp.n. has a body 1.9-2.4mm long; b=3.74.3; c=8.1-8.5; odontostyle 26.5-28.0 $\mu\textrm{m}$ long; spicules 71-74 $\mu\textrm{m}$ long; ventromedian supplements 15 and comes close to Westindicus chedongsongensis Choi et al., 1998 and Westindicus keralaensis Khan et al., 1994. Egtitus koriensis sp. n. is 1.8-2.0 mm long; b=3.4-4.1; c=14-18; odontostyle 20-21 $\mu\textrm{m}$, and comes close to Egtitus elaboratus Jairajpuri, 1994. Stopractinca glandulus sp. n. is 2.3-2.4 mm long; b=4.0-4.1; c=11-12; odontostyle 26-28 $\mu\textrm{m}$ and differs from other two known species viz., Stopractincta orientalis Khan et al., 1994 and Stopractincta malnadensis Dhanam et al., 1994 in having very thick body cuticle and longer cardia, and in the presence of a gland at the base of oesophagus.
Zakaullah Khan,Seon-Hye Son,Hyo Sun Moon,Sang Gyu Kim,신현동,Yong Ho Jeon,김영호 한국응용곤충학회 2007 Journal of Asia-Pacific Entomology Vol.10 No.4
The foliar nematode, Aphelenchoides fragariae (Ritzema Bos) Christie, was extracted from infected leaves of Helianthus tuberosus and Weigela subsessilis. The morphology and morphometry was studied and details provided additional morphological characteristics. The present population is characterized by having 4-5 annuli on lip region, visible with scanning electron microscopy. The two hosts, H. tuberosus and W. subsessilis, are newly recorded for the nematode in Korea.
Zakaullah Khan,Seon-Hye Son,신현동,김영호 한국식물병리학회 2008 Plant Pathology Journal Vol.24 No.1
Leaf blight symptoms and abnormal defoliation were found on Stachys riederi var. japonica, a medicinal plant, grown at Hongcheon, Gangwon province, Korea in 2007. A foliar nematode, Aphelenchoides fragariae was isolated from infected leaf tissues. The symptoms observed on host plant were leaf blotching, discoloration and browning of tissues, tan-colored interveinal necrotic lesions and large dead patches of necrotic tissues. This is the first report of A. fragariae occurring on S. riederi var. japonica.