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	Authors Year Title Journal
3608	Park, H.M. and S.Y. Choi. 1991 Changes in esterase activity and acetylcholinesterase sensitivity of insecticide-selected strains of the brown planthopper (Nilaparvata lugens Stal). Korean Journal of Applied Entomology 30(2): 117-123.
3672	Ponnamma, K.N., G. Rajeev, and J.J. Solomon. 1991 Detection of mycoplasma-like organisms in Proutista moesta (Westwood) a putative vector of yellow leaf disease of arecanut. Journal of Plantation Crops 19(1): 63-65.
3704	Qadeer, G.A, S.N. Sinha, and R.S. Tomar. 1991 Light trap catches of major insect pests of rice in Karnal district (Haryana) and its relation with climatic factors. Plant Protection Bulletin (Faridabad) 42(3-4): 1-6.
3709	Qi, L.Z., F.N. Huang, J.Y. Huang, and R. Li. 1991 Studies on management model of population life system of brown planthopper. Chinese Journal of Applied Ecology 2(3): 214-220. pdf
3743	Rahim, A., A.A. Hashmi and N.A. Khan. 1991 Effects of temperature and relative humidity on longevity and development of Ooencyrtus papilionis Ashmead (Hymenoptera: Eulophidae), a parasite of the sugarcane pest, Pyrilla perpusilla Walker (Homoptera: Cicadellidae). Environmental Entomology 20(3): 774-775.
3745	Rajendram, G.F. 1991 Electrophoretic study of enzymes from Sogatella furcifera Horvath population from Sri Lanka. Insect Science and Its Application 12(1-3) Special Issue: 275-278.
8415	Sawada, H., and A. Kusmayadi. 1991 Population characteristics of the brown planthopper in the northern west Java, Indonesia. Plant Protection 45(9): 369-372.
8416	Sawada, H., ans S.W. Gaib Soebroto. 1991 Life table studies on the brown planthopper in Indonesia. Plant Protection 45(9): 373-376.
3799	Remane, R. and W. della Giustina. 1991 La faune de France des Delphacidae II. Note de chasses faites, pour l’essentiel, en 1990 (Homoptera, Auchenorrhyyncha). Bulletin de la Societé Entomologique de France 96(4): 313-330.
3800	Remane, R. and W. della Giustina. 1991 La faune de France des Delphacidae (Homoptera, Auchenorrhyncha). I. Récoltes d`aout 1989. Cahiers des Naturalistes 47: 33-43.
3829	Riley, J. R., X.N. Cheng, X.X. Zhang, D.R. Reynolds, G.M. Xu, A.D. Smith, J.Y. Cheng, A.D. Bao, and B.P. Zhai. 1991 The long-distance migration of Nilaparvata lugens (Stal) (Delphacidae) in China: radar observations of mass return flight in the autumn. Ecological Entomology 16(4): 471-489
3888	Sahragard, A., M.A. Jervis, and N.A.C. Kidd. 1991 Influence of host availability on rates of oviposition and host-feeding, and on longevity in Dicondylus indianus Olmi (Hym. , Dryinidae), a parasitoid of the rice brown planthopper, Nilaparvata lugens Stal (Hem., Delphacidae). Journal of Applied Entomology 112(2): 153-162.
3898	Salin, K.P., C. Kailasam, and M. Gopalan. 1991 A mathematical model for population growth of buprofezin treated brown plant hopper Nilaparvata lugens Stal. (Homoptera: Delphacidae). Insect Science and Its Application 12(4): 391-394.
3910	Santini, L. 1991 Sulla comparsa in Toscana dell'omottero flatide neartico Metcalfa pruinosa (Say). Frustula Entomologica 12: 67-70.
3955	Saxena, R.C., C.G. Demayo, A.A. Barrion. 1991 Allozyme variation among biotypes of the brown planthopper Nilaparvata lugens in the Philippines. Biochemical Genetics 29(3-4): 115-123.
3966	Hopkins, R.M. 1991 Feeding behavior of the brown planthopper on susceptible and resistant cultivars. International Rice Resesearch Newsletter 16(6): 10.
4031	Shakila, M. 1991 A new genus Narowalenus (Homoptera: Fulgoroidea: Flatidae) from Pakistan. Pakistan Journal of Agricultural Sciences 28(4): 385-387. pdf
4059	Shear, W.A. 1991 The early development of terrestrial ecosystems. Nature 351: 283-289.
4090	Si, H.L., H.L. Joon, and Y.C. Kwang. 1991 Extraction of acetylcholinesterase from the housefly and three other insect species for in vitro anticholinesterase screening. Korean Journal of Applied Entomology 30(1): 18-28. pdf
4092	Silvanima, J.V.C. and D.R. Strong. 1991 Is host-plant quality responsible for the population pulses of salt-marsh planthoppers (Homoptera: Delphacidae) in northwest Florida? Ecological Entomology 16(2): 221-232.
4093	Simberloff, D. and T. Dayan,. 1991 The guild concept and the structure of ecological communities. Annual Review of Ecology and Systematics 22: 115-143.
4120	Soga, K., H. Ichihashi, and M. Taira. 1991 The outbreak of small brown planthopper and its related factors in Gifu Prefecture. Shokubutsu Boeki 45(1): 15-18.
4138	Sogawa, K. and T. Watanabe. 1991 Comparison of immigration of the rice planthoppers in Hangzhou, Zhejiang, China and Chikugo, Fukuoka, Japan during the baiu season. Proceedings of the Association for Plant Protection of Kyushu 37: 91-94. [Japanese] pdf
4193	Stiling, P.D., B.V. Brodbeck, and D.R. Strong. 1991 Population increases of planthoppers on fertilized salt-marsh cord grass may be prevented by grasshopper feeding. Florida Entomologist 74(1): 88-97.
4194	Stiling, P.D., A. Throckmorton, J. Silvanima, and D.R. Strong. 1991 Biology of and rates of parasitism by nymphal and adult parasites of the salt-marsh-inhabiting planthoppers Prokelisia marginata and P. dolus. Florida Entomologist 74(1): 81-87. pdf

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