Japanese Journal of Applied Entomology and Zoology
Online ISSN : 1347-6068
Print ISSN : 0021-4914
ISSN-L : 0021-4914
Short Communications
Seasonal Occurrence, Developmental Time, and Sex Ratio of the Long-Legged Velvet Mite, Erythraeus nipponicus(Trombidiformes: Erythraeidae)
Kotaro ShinoharaAtsushi KasaiTsutomu Saito
Author information
JOURNAL FREE ACCESS

2017 Volume 61 Issue 3 Pages 183-186

Details
Abstract

A large number of mite larvae feeding on aphids was observed between late June and early July, and between August and September in Shizuoka, Central Japan. Developmental times from egg to adult emergence at 15, 20, 25, and 30°C were 128.0, 67.5, 43.8, and 35.0 days, respectively; the lower threshold temperature and effective accumulative temperature for development were estimated as 9.3°C and 711 degree-days, respectively. The sexes were distinguishable by the presence of the amphioid sclerite that is positioned in the genital opening of the male. The sex ratio was approximately 1 : 1, and the body length of adult females was significantly larger than that of adult males.

Content from these authors
© 2017 The Japanese Society of Applied Entomology and Zoology
Previous article Next article
feedback
Top