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nrnH"p;nfr evnpr.;:n w;ncT {ht'rn e"H hnHv rnlAnr nvpr p Hrnpfl rAnop nf nvnlnhml dens;t.;os in rt LtULLLI-tb ttVLtUllLW tt ttO -VA ]-] t-ttV -JVVJ -V;vvvtwLN] vv-u i ---ev v' .'J"'r""' """ '' both sexcs: totally brachypterous lines with yellowish brown or highly melanized body colour and totally macropterous lines with highly melanized or yellowish brown body colour, Thus, wing form and body colouration arc control]ed by different genes. By successive selections based solcly on wing form, two lines producing predeminantly brachypterous or macropterous wing forms were obtained, but they exhibited an intermediate body colour between yellowish brown and black, VVhen five field-collected strains were reared under high density cenditions, their wing form and body colour responses to rearing density remained unchanged fbr more than over 20 generatiens. On the other hand, maintcnance of these strains under low density conditions rendered thcrn to exhibit considerable diflerent responses from original oncs, cvcn though no special selection has been given, Thesc results suggest that genetically controlled characters can be stably exhibited under high density conditions, while phenotype expression under Iow density conditions is largely influenced by the physiologica} situation of the individual hoppers, Kay wortts: wing form, body colour, wing-polymorphisrn, density, IVitoparwata lugens

applied entomology and zoology

Maintenance and Selection of Strains Exhibiting Specific Wing Form and Body Colour under High Density Conditions in the Brown Planthopper, Nilaparvata lugens(Homoptera:Delphacidae)