The wing polymorphism in rice grasshopper,Oxya yezoensi Shiraki(Orthopera
小翅稻蝗(Oxya yezoensis Shiraki)翅多型现象浅释

The seasonal change of wing form and effect of different photoperiod of rice grasshopper,Oxya yezoensis Shiraki were investigated in the field and in the laboratory.The frequency distribution of relative wing length of adults showed a continuous bimodality with brachypterous and macropterous forms.There was large variation in each morph and only the latter types can fly.On July 28 most adults were in brachypterous form,afterwards the percentage of macropters gradually increased and then most adults were fou...