Relationship between development,reproduction of Planococcus vovae and temperatures
In order to investigate the influence of temperature on the growth,development and reproduction of Planococcus vovae,the survival rate,developmental period,developmental threshold temperature,effective accumulated temperature,fecundity and developmental rate of P.vovae were measured at 17℃,20℃,23℃,26℃,29℃ and 32℃ under six constant temperature conditions,and the laboratory population life table at different temperatures was constructed.Results showed:1)The temperature significantly influenced the developmental period of P.vovae,the developmental period of different stages of P.vovae decreased and then increased as temperature increasing from 20℃ to 32℃;the shortest period was 27.00 d for the female at 26℃ and 23.17 d for the male at 29℃;the longest developmental duration of female and male nymph were 92.06 d and 86.80 d,respectively,at 20℃.2)There was a quadratic regression between developmental rates and temperature for each insect state of P.vovae,except for the pupal stage of males.3)The highest survival rate of the female and male were 64.58％and 64.27％,respectively at 26℃.4)Both pre-oviposition and adult longevity of female adults declined progressively with increasing temperatures.The egg production was the highest at 26℃ with 193.25 eggs per female and lowest at 17℃ with 84.20 eggs per female.5)The developmental threshold temperatures of the female and male generations were 19.04℃ and 15.02℃,and the effective cumulative temperatures were 461.29 day-degrees and 353.42 day-degrees.6)The population trend index was 62.3 and 16.1 at 26℃ and 20℃,respectively;the second instar of P.vovae showed growth stagnation at 17℃,which lasted for more than 80 d;the developmental period of the second and third instars of P.vovae was all prolonged at 32℃.The most suitable temperature range is 23～29 ℃ for the growth,development and reproduction of P.vovae.
Planococcus vovaedevelopmental durationlife tabledevelopmental threshold temperatureeffective accumulated temperature
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