[Objectives] To investigate the effect of
different melon varieties on the growth,
development and fecundity of
Tetranychus
truncates Ehara, and thereby provide information to guide the choice of watermelon
and
muskmelon varieties and the integrated management of this pest.
[Methods] The effects of five different melon varieties,
including Zaojia watermelon 8424, Meidu watermelon, Jiamei watermelon,
Jinyuhong
muskmelon No.2
and Yugu
muskmelon, on
the growth, reproduction, survival and life-table parameters of
T.
truncates, were
studied under laboratory conditions.
[Results] The survival rate of
T. truncates on Zaojia watermelon 8424 and Yugu
muskmelon was
95.00% and 86.55% respectively, whereas that on Meidu watermelon and Jinyuhong
muskmelon No.2
was 75.38% and 70.45%, respectively. The reproductive capacity of
T.
truncates on different melon varieties differed significantly; highest
reproductive fitness was recorded on Zaojia 8424 and Meidu watermelons, which
indicates that these varieties have the lowest resistance to this pest, and
that the oviposition period is relatively long and the number of eggs laid
relatively high on these varieties. An average of (35.31±5.35)
eggs per female were laid on Zaojia 8424 watermelon compared to (19.96±2.02)
per female on Jiamei watermelon. In addition, the highest intrinsic growth rate
rm and weekly growth rate
λ were recorded on the Meidu
Watermelon and Zaojia Watermelon 8424 varieties; 0.203 1, 0.161 7 and 1.225 2,
1.175 5, respectively. Jiamei Watermelon had the lowest net value-added rate (
R0)
of 16.7.
[Conclusion] Among the
five melon varieties tested, Zaojia watermelon 8424 and Meidu watermelon were
the most suitable for the growth and reproduction of
T.
truncates, whereas the Jiamei
muskmelon was
the most resistant to this pest.