IJH-2018v8n17 - page 8

International Journal of Horticulture, 2018, Vol.8, No.17, 197-203
199
effectiveness. The next best treatments included Imidacloprid 200 SL @ 45 g a.i./ha, Spinosad 45 SC @ 84.375 g
a.i./ha and Standard check (Monocrotophos 36 WSC @ 360 g a.i./ha followed by Dimethoate 30 EC @ 521 g
a.i./ha) with 1.2, 1.4 and 1.6 thrips per leaf, respectively (Table 1).
Table 1 Efficacy of Fipronil 80 WG (Regent 80 WG) against thrips in grapevines (First season)
Tr.
No.
Treatment
Dose/ha
(g/ml)
Dose
(g a.i./ha)
Pre-treatment
Count
(1 DBS)
Post treatment counts (No. of thrips/leaf)
After I spray
After II spray
3 DAS 7 DAS 10 DAS 3 DAS 7 DAS 10 DAS
T
1
Fipronil 80 WG (Regent 80 WG) 50
40
10.1
a
6.4
a
5.1
a
3.5
a
2.8
ab
1.5
a
0.5
ab
T
2
Fipronil 80 WG (Regent 80 WG) 62.5
50
9.4
a
6.2
a
4.8
a
3.4
a
2.6
a
1.2
a
0.4
a
T
3
Fipronil 5 SC (Regent 5 SC)
800
40
10.7
a
7.2
ab
5.8
ab
4.6
ab
3.9
bc
2.7
b
0.9
a-c
T
4
Spinosad 45 SC (Tracer 45 SC) 187.5 84.375 9.6
a
8.3
b
6.5
bc
5.8
bc
4.7
cd
3.8
c
1.4
c
T
5
Imidacloprid 200 SL
(Confidor 200 SL)
225
45
10.5
a
8.5
bc
6.7
bc
5.5
bc
4.5
cd
3.5
bc
1.2
bc
T
6
Monocrotophos 36 WSC-
Dimethoate 30 EC (RPP)
1000
1700
360
521
9.9
a
8.6
bc
7.0
c
6.2
c
5.5
d
4.0
c
1.6
c
T
7
Untreated check (Water spray)
-
-
10.2
a
9.9
c
9.7
d
9.5
d
9.4
e
9.2
d
9.1
d
S.Em. ±
-
-
0.7
0.5 0.4 0.4
0.4 0.3 0.2
C.D. (0.05)
-
-
NS
1.5 1.2 1.2
1.2 1.0 0.7
C.V. (%)
-
-
12.3
11.0 10.1 12.2 14.3 15.6 19.1
Note: T
1
to T
5
- Two sprays at 10 days interval, T
6
- Monocrotophos (1
st
Spray) followed by Dimethoate (2
nd
Spray) at 10 days interval;
DBS= Day before spray, DAS= Days after spray, RPP= Recommended package of practice; In the vertical columns means followed
by same letters are not different statistically (P= 0.05) by DMRT
2.2 Second year
2.2.1 First spray
At one day before insecticidal spray, the thrips population varied from 11.3 to 12.6 per leaf with non-significant
differences among various treatments (Table 2).
Table 2 Efficacy of Fipronil 80 WG (Regent 80 WG) against thrips in grapevines (Second Season)
Tr.
No.
Treatment
Dose/ha
(g/ml)
Dose
(g a.i./ha)
Pre-treatment
Count
(1 DBS)
Post treatment counts (No. of thrips/leaf)
After I spray
After II spray
3 DAS 7 DAS 10 DAS 3 DAS 7 DAS 10 DAS
T
1
Fipronil 80 WG (Regent 80 WG) 50
40
11.5
a
8.6
a
6.4
ab
4.7
a
3.4
a
2.3
a
0.90
ab
T
2
Fipronil 80 WG (Regent 80 WG) 62.5 50
11.6
a
8.1
a
6.2
a
4.2
a
3.0
a
2.0
a
0.60
a
T
3
Fipronil 5 SC (Regent 5 SC)
800
40
12.2
a
9.6
ab
7.5
bc
6.4
b
5.2
b
3.1
b
1.33
bc
T
4
Spinosad 45 SC (Tracer 45 SC) 187.5 84.375 11.3
a
9.8
ab
8.5
cd
7.5
bc
6.4
c
4.3
c
1.50
cd
T
5
Imidacloprid 200SL
(Confidor 200 SL)
225
45
12.1
a
12.0
c
8.8
d
7.8
c
7.2
cd
5.2
d
1.80
d
T
6
Monocrotophos 36 WSC-
Dimethoate 30 EC (RPP)
1000
1700
360
521
12.2
a
11.2
bc
9.6
d
8.3
c
7.8
d
5.5
d
1.90
d
T
7
Untreated check (Water spray)
-
-
12.6
a
12.2
c
11.8
e
11.6
d
11.2
e
11.1
e
11.00
e
S.Em. ±
-
-
0.7
0.6 0.4 0.4
0.3 0.3 0.1
C.D. (0.05)
-
-
N.S.
1.7 1.1 1.2
0.9 0.8 0.4
C.V. (%)
-
-
9.7
9.5 7.5 9.6
7.7 9.2 9.0
Note: T
1
to T
5
- Two sprays at 10 days interval, T
6
- Monocrotophos (1
st
Spray) followed by Dimethoate (2
nd
Spray) at 10 days interval;
DBS= Day before spray, DAS= Days after spray, RPP= Recommended package of practice; In the vertical columns means followed
by same letters are not different statistically (P= 0.05) by DMRT
At three days after first spray, Fipronil 80 WG @ 50 g a.i./ha recorded lowest population of 8.1 thrips per leaf
followed by Fipronil 80 WG @ 40 g a.i./ha (8.6 thrips/leaf), Fipronil 5 SC @ 40 g a.i./ha (9.6 thrips/leaf) and
Spinosad 45 SC @ 84.375 g a.i./ha (9.8 thrips/leaf) and were equally effective against thrips. The latter two
1,2,3,4,5,6,7 9,10,11,12,13,14
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