and Integrated Pest Management - part - usaid

Table 2. Effect of different insecticide use strategies on rice pests and beneficials on BPH-susceptible and resistant rice
varieties. Jatisari, W. Java, wet season, 1986/8 7.a
Regime IWBPHb BPHb Whorl maggot Leaffolder Gall midge Spidersc CyrtorhinusC
(per
z
hill) (per hill) (% damaged (% folded (% onion (per 20 (per 20
leaves) leaves)
47 DAT
shoots)
75 DAT
hills)
26 DAT
hills)
47 DAT 75 DAT 61 DAT 61 DAT
Var. Pelita (BPH-susceptible)
Untreated 73.0 b 124.0 a 3.4 b 8.9
Maximum
b
protection
10.0 b
0.03
46.7
a
c
5.8
137.0
a
be
0.65 a 2.3
Minimum
a 2.8
protection
a
18.9
8.3 a
a
4.0
21.0
a
a 3.5 b 7.0 b
Low econ.
9.3
thresholds
b 32.0
1.9
b
a
250.0
14.3
c
a 3.4 b 7.5 b
High
9.7
econ.
b
thresholds
4.7 a
8.4
4.7
a
a
71.9 a 3.7 b 5.9 b
Farmer pmctices
8.3 b 32.7
8.9
b
a
179.0
23.5
bc
a 3.4 b 6.5 b 5.6 ab 30.7 b 90.0 ab
Var. Cisadane (UPH-resistant)
Untreated 10.4 c 2.4 ab 2.5 b 5.7 bc
Maximum
3.1
protection
a 32.3
0.01
c 104.0
a
be
1.9 ab
>
0.39 a 2.2
Minimum
a
protection
2.3 a
7.1
8.0
be
a
3.5
4.0
abe
a
1.8 b 6.8 c
Low econ.
4.3
thresholds
a 29.7
4.7
bc
be
67.0
7.0
b
c 2.2 b 8.9
High
d
econ.
5.2
thresholds
a
10.7
7.7
abe
a 19.0
5.4 be
a
2.9 b 6.4 be
Farmerpractices
4.7 a 32.3 c
1.1
115.0
ab
c
1.6 a 2.6 b
aAll figures
4.8
are
b
mean of 3
4.2
replicates;
a
means
26.3
with
b
the same
25.0
letter
a
are not significantly different at P =
bWBPH = Whiteback
0.05 by DMRT.
planthopper, BPH = Brown planthoppzr, both counted by eye (ca. 20% efficient). cCounted by sticky
board.
Q