Effects of temperature on the development of overwintering eggs of Ricania sublimbata Jacobi on the tea plant
In order to clarify the effects of temperature on the development of overwintering eggs of Ricania sublimbata Jacobi,the developmental duration and egg hatching rate of this pest were investigated at constant temperatures of 13,16,19,22,25℃ and 28℃ in the laboratory and under natural temperature outdoors(the daily mean temperature ranged from 8.87℃ to 26.40℃,with a daily average temperature of 16.89℃).The results showed that the developmental durations of the overwintering eggs at constant temperatures were 62.28,28.58,13.51,10.11,10.33 and 7.07 days,respectively,and the higher the temperature,the shorter the developmental duration of the overwintering eggs.The relationship between temperatures and development rates of R.sublimbata overwintering eggs satisfied the equation:y=-0.086+0.008x.The developmental threshold temperature was 10.80℃ and the effective accumulated temperature was 125 degree-days.The overwintering eggs of R.sublimbata begun to hatch on April 10 under natural temperature conditions outdoors,and the cumulative hatching rate reached 73.37％on May 5.The results revealed that the first-generation nymphs hatched from overwintering eggs of R.sublimbata during this period in Xinyang tea area.This study laid a theoretical basis for the prediction of occurrence period and the control strategy of this pest in Xinyang tea-producing area.
万方数据
维普
