감자수염진딧물 (Macrosiphum euphorbiae Thomas)의 온도발육모형과 출산생명표

The nymphal development of the potato aphid, Macrosiphum euphorbiae (Thomas), was studied at seven constant temperatures (12.5, 15.0, 17.5, 20.0, 22.5, 25.0, and 27.5±1°C), 65±5% relative humidity (RH), and 16 : 8 h light/dark photoperiods. The developmental investigation of M. euphorbiae was separated into two steps, the 1st through 2nd and the 3rd through 4th stages. The mortality was under 10% at six temperatures. However, it was 53.0% at 27.5°C. The developmental time of the entire nymph stage was 15.5 days at 15.0°C, 6.7 days at 25.0°C, and 9.7 days at 27.5°C. In the immature stage, the lower threshold temperature of the larvae was 2.6°C and the thermal constant was 144.5 DD. In our analysis of the temperature-development experiment, the Logan-6 model equation was most appropriate for the non-linear regression models (r 2=0.99). When the distribution completion model of each development stage of M. euphorbiae larvae was applied to the 2-parameter and 3-parameter Weibull functions, each of the model’s goodness of fit was very similar (r 2=0.92 and 0.93, respectively). The adult longevity decreased as the temperature increased but the total fecundity of the females at each temperature was highest at 20°C. The life table parameters were calculated using the whole lifespan periods of M. euphorbiae at the above six temperatures. The net reproduction rate (R0) was highest at 20.0°C (63.2). The intrinsic rate of increase (rm) was highest at 25°C (1.393). The finite rate of doubling time (Dt) was the shortest at 25.0°C (2.091). The finite rate of increase (λ) was also the highest at 25.0°C (1.393). The mean generation time (T ) was the shortest at 25.0°C (9.929).