Applied Entomology and Zoology
Online ISSN : 1347-605X
Print ISSN : 0003-6862
ISSN-L : 0003-6862
Regular Papers
Effects of temperature on oviposition in overwintering females and hatch in first-generation larvae of Pseudaulacaspis pentagona (Hemiptera: Diaspididae)
Mitsuyoshi Takeda
Author information
JOURNAL FREE ACCESS

2004 Volume 39 Issue 1 Pages 15-26

Details
Abstract
Overwintering females of Pseudaulacaspis pentagona (Targioni) entered a reproductive diapause, and the ovary development in females collected before December 22 was retarded at 20°C under short (L10 : D14) and long (L15 : D9) days. In contrast, ovarian eggs in females collected after the beginning of the year developed normally. I examined the effects of temperature on the development of overwintering females that infested tea branches and on the hatch of the first generation at various constant temperatures. The base temperature was determined to be 10.5°C and 10.9°C for 50% of the females to begin laying eggs and for the egg hatch to reach a peak, respectively. Seasonal changes in oviposition of the overwintering generation and hatch of the first generation were monitored from 1998–2002 at Kanaya, Shizuoka Prefecture. When the base temperature was assumed to be 10.5°C and day-degrees (DD) were summed from January 1, 50% of the females began laying eggs when an average of 149 DD had accumulated, and the peak of hatching coincided with an average of 288 DD. The logistic equation y=1/[1+exp{−(α01x)}] (y, proportion of parous females or hatch; x, DD accumulations; α0 and α1, constants) was used to model a sequence of the population events and to predict the optimum timing of insecticide application for controlling the first-generation larvae of P. pentagona.
Content from these authors
© 2004 by the Japanese Society of Applied Entomology and Zoology
Previous article Next article
feedback
Top