Title: Biological characteristics of Rammeacris kiangsu Tsai and distinction between female and male nymphs in different instars
Abstract:Rammeacris kiangsu Tsai is an important forest pest in China,and causes serious harm to bamboo production.To provide basic data for investigation and forecasting of occurrence,the development period,b...Rammeacris kiangsu Tsai is an important forest pest in China,and causes serious harm to bamboo production.To provide basic data for investigation and forecasting of occurrence,the development period,body size and characteristics of external genitalia of nymphs in different instars,and the pre-oviposition period of adults in R.kiangsu collected from Yongchang,Changnin,Taojiang,and Guilin were investigated.The results show that the developmental period of female and male nymphs were 68.3~73.6 days and 60.8~64.2 days respectively at 25 ℃.There were no significant differences both in female and male nymphs among the four populations.All male nymphs had five instars,but some of the female nymphs had five instars and some had six instars.The percent of nymphs that had six instars was 55.6 %,40.0 %,27.3 % and 17.0 % in Yongchang,Changning,Taojiang,and Guilin population,respectively.The developmental period of nymphs within 1~4th instars were 10~13 days respectively,the period of the 5th instars was about 17 days,and that of the 6th instars was more than 17 days.The pre-ovipositional periods of adult females in Yongchang,Changning,and Taojiang populations were about 35 days,but that of adults in the Guilin population was longer than 50 days.Meanwhile,the observation of nymphal external genitalia in different instars showed that the instars and sex of nymphs could be distinguished by the characteristics of the genitalia.Combined with the data collected from head width and femur length of hind leg of nymphs in different instars,the findings could provide reference for investigation and forecasting of occurrence.Read More
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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