小翅稻蝗(Oxya yezoensis Shiraki)翅多型现象浅释

对小翅稻蝗翅型构成的季节变化，长翅型、短翅型产卵前期间的差异及光周期对翅型分化的影响进行了调查，结果表明，小翅稻蝗存在着明显的翅多型现象，相对翅长(前翅长/后足腿节长)最长可达1.49，最短只有0.50，翅长呈连续性双模态分布。早期羽化的个体大多为长翅型，随着季节的推移，羽化成虫短翅率逐渐增加。长翅型雌成虫的产卵前期间为42.7±13.1日，短翅型为15.3±6.4日，短翅型雌成虫的产卵前期间显著短于长翅型。不同的光周期短翅成虫出现的比例不同，光照短于LD1212时，几乎全为短翅型，LD1410短翅率为66.8%，LD168则长翅率达62.1%，光照长于LD186时，几乎全为长翅型。

The wing polymorphism inrice grasshopper,Oxya yezoensi Shiraki(Orthopera

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...