摘要
Studies on the effect of temperature on the development of the water chestnut beetle, Galerucella birmanica Jacoby were carried out in the laboratory at seven different temperatures： 16 ℃, 19 ℃, 22 ℃, 25 ℃, 28 ℃, 31 ℃ and 34 ℃. The developmental time decreased with increase in temperature. The developmental time at 16 ℃, 19℃, 22 ℃, 25 ℃, 28 ℃, 31 ℃ and 34 ℃ was 96.60, 80.68, 58.96, 43.48, 35.03, 30.08 and 28.02 days for the period from egg hatching to adult emergence, respectively. The developmental threshold estimated for a generation by linear regression was 10.36℃. The fecundity per female at 22 ℃, 25 ℃, 28 ℃, 31 ℃ and 34 ℃ was 102.3, 134.5, 141.2, 130.1 and 116.2 eggs, respectively. Oviposition period ranged from 15.6 days at 22 ℃ to 8.6 days at 34 ℃. Hatchability of eggs was highest at 31 ℃ with 76.9% and lowest at 34 ℃ with 57.1%. The highest generation survival rate was 65.3% at 31 ℃, and the intrinsic rate of natural increase （rm） for G. birmanica was the highest at 34 ℃.
Studies on the effect of temperature on the development of the water chestnut beetle, Galerucella birmanica Jacoby were carried out in the laboratory at seven different temperatures： 16 ℃, 19 ℃, 22 ℃, 25 ℃, 28 ℃, 31 ℃ and 34 ℃. The developmental time decreased with increase in temperature. The developmental time at 16 ℃, 19℃, 22 ℃, 25 ℃, 28 ℃, 31 ℃ and 34 ℃ was 96.60, 80.68, 58.96, 43.48, 35.03, 30.08 and 28.02 days for the period from egg hatching to adult emergence, respectively. The developmental threshold estimated for a generation by linear regression was 10.36℃. The fecundity per female at 22 ℃, 25 ℃, 28 ℃, 31 ℃ and 34 ℃ was 102.3, 134.5, 141.2, 130.1 and 116.2 eggs, respectively. Oviposition period ranged from 15.6 days at 22 ℃ to 8.6 days at 34 ℃. Hatchability of eggs was highest at 31 ℃ with 76.9% and lowest at 34 ℃ with 57.1%. The highest generation survival rate was 65.3% at 31 ℃, and the intrinsic rate of natural increase （rm） for G. birmanica was the highest at 34 ℃.
