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	Authors Year Title Journal
8003	Iitomi, A., and T. Kishi. 1991 Damage of rice (Oryza sativa) plant in the late stage of ripening injured by the brown rice planthopper, Nilaparvata lugens Stal (Homoptera: Delphacidae) in Akita prefecture, 1990. Annual Report of the Society of Plant Protection of North Japan 42: 85-87.
8008	Ishiguro, K. and M. Yanase. 1991 Effects of feeding by white-backed planthopper, Sogatella furcifera Horvath, small brown planthopper, Laodelphax striatellus Fallen and brown rice planthopper, Nilaparvata lugens Stal for quality on brown rice. Annual Report of the Society of Plant Protection of North Japan 42: 88-90.
8078	Abe, T. and K. Koyama. 1991 Embryonic development and selective oviposition of a dryinid wasp, Haplogonatopus atratus Esaki et Hashimoto (Hymenoptera : Dryinidae). Japanese Journal of Applied Entomology and Zoology 35(1): 57-63.[Japanese] pdf
8085	Kartohardjono, A., T. Tersyana, T., R.W. Atmadja, and Nursasongko. 1991 Role of Cyrtorhinus sp. predator as biological control of brown planthopper in rice field. In: J. Sujitno, D. Kilin, Hs. Suprapto, and U. SutrisnoGunara, (eds.). Research on brown planthopper (Nilaparvata lugens Stal.) in 1987/88. Balai Penelitian Tanaman Pangan Bogor. Edisi Khusus 2. Bogor, Indonesia. Pp. 54-63
8092	Khan, M.R., M. Ahmad, S. Ahmad, M. Latif, Latif-ur-Rehman, and S. Ali. 1991 Some studies on varietal resistance of rice to leaf and planthoppers. Sarhad Journal of Agriculture 7(1): 83-89.
8093	Khan, M.S. and K.S. Kushwaha. 1991 Assessment to yield losses caused by white backed planthopper Sogatella furcifera (Horvath) various growth stages. Indian Journal of Entomology 53(1): 102-107.
8097	Kilin, D., and T. Sumpena. 1991 Evaluation of integrated pest control of brown planthopper. In: J. Sujitno, D. Kilin, Hs. Suprapto, and U. SutrisnoGunara, (eds.). Research on brown planthopper (Nilaparvata lugens Stal.) in 1987/88. Balai Penelitian Tanaman Pangan Bogor. Edisi Khusus 2. Bogor, Indonesia. Pp.73-75.
8099	Kim, D.H., G.H. Lee, J.D. So, J.H.Yuh, and J.H. Kim. 1991 Resistance aspects on different growth stages and field resistance of rice varieties to brown planthopper, Nilaparvata lugens Stal. (Homoptera : Delphacidae). Research Reports of the Rural Development Administration 33(3): 33-39.
8139	Laba, I.W. 1991 Predation of Cyrtorhinus lividipennis Reuter on eggs of planthoppers in rice. Master’s Thesis, University of the Philippines at Los Baños. Los Baños, Laguna, Philippines. thesis pdf
8158	Kwon, O.K., B.H. Song, H.M. Park, and Y.H. Jeong. 1991 Identification of insecticidal ingredient in castor oil plant against brown planthopper. Research Reports of the Rural Development Administration (Crop Protection) 33(2): 74–79.
8164	Laba, W.and T. Sumpena. 1991 Effects of insecticides on resurgencies and predators of brown planthopper (Nilaparvata lugens Stal.). In: J. Sujitno, D. Kilin, Hs. Suprapto, and U. SutrisnoGunara, (eds.). Research on brown planthopper (Nilaparvata lugens Stal.) in 1987/88. Balai Penelitian Tanaman Pangan Bogor. Edisi Khusus 2. Bogor, Indonesia. Pp. 86-90.
8169	Lee, H.R. and J.W. Kim. 1991 Studies on insecticide resistance to the several strains of brown planthopper (Nilaparvata lugens Stal) in Chungbuk province. Journal of Agricultural Science Chungbuk National University 9(1): 111-118.
8176	Lee, K.Y., K.M. Choi, Y.H. Kim, H.G. Goh, and J.H. Kim. 1991 Predation and parasitism of Pseudogonatopus flavifemur (Hymenoptera : Drynidae) on the hoppers and its life history. Research Reports of the Rural Development Administration (Crop Protection) 33(1): 45-49.
8178	Lee, S.G., H.G. Goh, K.B. Uhm, K.M. Choi, and J.K. Kim. 1991 Studies on varietal resistance of barley cultivars to Laodelphax striatellus (Homoptera : Delphacidae). Research Reports of the Rural Development Administration (Crop Protection) 33(2): 26-33.
8181	Lei, H.Z., G.Q. Liu, and Z.P. Peng. 1991 Identification of brown planthoppers resistance in germplasms of hybrid rice in 1986-1989. Hybrid Rice 1: 34-37.
8185	Li, Q., S.Y. Luo, S.M. Wei. 1991 First report on the study of biotypes of rice brown plant hoppers in Guangxi. Guangxi Agricultural Sciences 1: 29-32.
8191	Liao, S.C., M,Z, Lin, and Z.X. Lu 1991 Effects of ethofenproxon rice brown hopper and its main natural enemies. Guangxi Agricultural Sciences 1: 35-37.
8209	Liu, Y.B., J.L. Yang, and L. Lin. 1991 A study on the dynamics of Sogatella furcifera (Horvath) and Nilaparvata lugens Stal in Yunnan Province. Insects Knowledge 28(5): 257-261.
8216	Luong, M.C. 1991 Population dynamics of the brown planthopper (Bph) and its natural enemies in Mekong Delta. Nong Nghiep Cong Nghiep Thuc Pham [Journal of Agriculture and Food Industry] 1991(3): 97-100.
8217	Luong, M.C. 1991 The development of BPH biotype in Mekong delta. Nong Nghiep Cong Nghiep Thuc Pham [Journal of Agriculture and Food Industry] 1991(5): 210-212.
8230	Mani, C. and M. Gopalan. 1991 Effect of flufenoxuron on the development of rice white backed planthopper, Sogatella furcifera Horv. and rice green leafhopper, Nephotettix virescens (Dist.). Indian Journal of Entomology 53(1): 50-58.
8280	Nguyen, C.T. and M.C. Nguyen. 1991 The changes of Bph biotype in Mekong delta. Thong Tin Bao Ve Thuc Vat [Plant Protection Bulletin] 2: 4-9.
8287	Nguyen, V.L. and M.C. Luong. 1991 Investigation of resistance exchange of rice varieties to brown planthopper (BPH). Bao Ve Thuc Vat [Plant Protection Journal] 3: 8-11.
8288	Nguyen, V.L., M.C. Luong, and T.L. Nguyen. 1991 New rice varieties resistant to the brown planthopper in the Mekong river delta. Nong Nghiep Cong Nghiep Thuc Pham [Journal of Agriculture and Food Industry] 12: 541-544.
8293	Nipha, C. 1991 Water use to control brown plant hopper. Warasan Kita Lae Sattawawitthaya [Entomology and Zoology Gazette] 13(4): 189-193.

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