Effect of temperature on the development and fecundity of Dianphania india(Saunders)
[Aim]To determine the effects of different temperatures on the growth,development and fecundity of Dianphania india(Saunders),and to determine the developmental threshold and effective accumulated temperatures.The findings of this study will provide a scientific basis for the measurement and comprehensive management of D.india.[Methods]Development threshold temperature,effective accumulated temperature,and life table parameters of D.india were analyzed in the laboratory under controlled temperatures of 21,24,27,30,and 33 ℃.[Results]There was a significant effect of temperature on the different developmental stages of D.india.Egg duration(4.52 d),larval duration(25.32 d),pupae duration(13.98 d),female lifespan(56.44 d),male lifespan(52.79 d),and generation duration(46.15 d)peaked at 21 ℃.However,subsequent further increases in temperature resulted in an opposite trend,with all values gradually decreasing and reaching a minimum at 33 ℃.The developmental threshold temperature for egg,larva,pupa,adult,and whole generation were 13.54,9.90,14.28,and 15.00 ℃,respectively,and the effective accumulated temperatures were 38.00,287.00,77.72,and 277.60 degree·days,respectively.The intrinsic rate of increase(rm)(0.179 21)and the finite rate of increase(λ)(1.196 27)peaked at 33 ℃.However,female egg production began to decline at 33 ℃.The net reproductive R0(84.212)rate was the highest at 30 ℃,while the gross reproductive rate GRR(94.486)was the highest at 27 ℃.The average generation time Tat 21,24,27,30,and 33 ℃ was 43.027,36.219,28.097,27.618 and 20.532 days,respectively.[Conclusion]Between 21 ℃ and 33 ℃,the developmental duration of each state and the average generation time of D.india decreased with increasing temperature.The optimal temperature for reproduction was 27 ℃,whereas temperatures above 33 ℃ were not conducive to D.india reproduction.
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