M. Morishita et A. Takafuji, Diapause characteristics of the Kanzawa spider mite, Tetranychus kanzawai Kishida, in pea fields of central Wakayama Prefecture, Japan, JPN J A ENT, 43(4), 1999, pp. 185-188
Citations number
2
Categorie Soggetti
Entomology/Pest Control
Journal title
JAPANESE JOURNAL OF APPLIED ENTOMOLOGY AND ZOOLOGY
The diapause status was studied of the Kanzawa spider mite, Tetranychus kan
zawai Kishida, occurring in pea fields and on non-cultivated hosts along th
e field in central Wakayama Prefecture, Japan. The proportion of diapausing
females on peas and the non-cultivated evergreen host, Akebia quinata (Thu
nb.), increased through autumn, reaching a peak of 60% in December, but dec
lined thereafter. In November, a higher proportion of diapausing females wa
s found on another non-cultivated deciduous host, Clerodendrum trichotomum
Thunb. than on the above two hosts. This earlier increase on C. trichotomum
was due to the host defoliation. The diapause percentage of T. kanzawai at
16 degrees C and 20 degrees C was close to 100% at daylengths shorter than
10 h. The critical daylength for diapause induction was between 10 and 11
h.