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THE CONTROL EFFECT OF LONG TERM PRESERVATION AND UTILIZATION OF NATURAL ENEMIES IN PADDY FIELD AGAINST BROWN PLANTHOPPERS Optimized conditions for group inoculation of white backed planthoppers and control effects of antivirotic agents on Southern rice black-streaked dwarf virus Hemipteran and dipteran pests: Effectors and plant host immune regulators Molecular Identification of Bamboo Planthoppers (Hemiptera:Delphacidae) Based on Mitochondrial 16S rDNA Gene Sequences