The Guangxi population have a high brachypterous ratio, being similar to the tropical type.
广西种群接近热带型，其雌虫短翅率高但不随密度而变化。
2
The Zhejiang populations show low brachypterous ratios and have a negative correlation with nymphal density, belonging to the temperate type.
迁入地的浙江各种群属温带型，其雌虫短翅率低且与密度呈显著负相关；
3
BPH feeding on rice plants at various stages have dfferent brachypterous ratios, tillering plants cause more brachypterous females than booting rice plants.