Abstract:
The effect of eight
Cucumis
L. (Cucurbitaceae) genotypes, including native cuc
umber
genotypes (Hormozgan, Bushehr and Gilan), greenhous
e cucumber genotypes (Girtap,
Negeen, Sepehr and Pouya) and Armenian cucumber (
Cucumis melo
var.
flexuosus
) was
studied on the life table and population growth par
ameters of
Aphis gossypii
Glover to
evaluate antibiosis resistance. The experiment was
conducted at 25±1°C, 60±10% RH and
a photoperiod of 16:8 hour (L:D). The data were ana
lyzed by Two-Sex MSChart
program. The most pre-adult mortality (22.6 %) and
the shortest total life span (14.5
days) were recorded for ‘Bushehr’. The net Reproduc
tive rate (R
0
) ranged from 43.70 for
‘Bushehr’ to 92.39 nymphs per individual in the cas
e of ‘Pouya’. The lowest value of the
intrinsic rate of increase (r) and the finite rate o
f increase (
λ
) was observed in ‘Gilan’
(0.378 and 1.460 day
−1
, respectively) and the highest in ‘Pouya’ (0.471 a
nd 1.602 day
−1
,
respectively). The maximum and minimum mean generat
ion Times (T) were 10.20 and
9.23 days in ‘Gilan’ and ‘Negeen’, respectively. On
the basis of these parameters, ‘Gilan’
had the highest antibiosis resistance to
A
.
gossypii
. Information on life table of pests and
subsequent host resistance evaluation improves IPM
programs and leads us to genotype
selection for crop breeding programs.
Keywords:
Antibiosis,
Aphis gossypii
,
Cucumis
, Life table, Plant resistance.
