IJH-2018v8n17 - page 9

International Journal of Horticulture, 2018, Vol.8, No.17, 197-203
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treatment were at par with Standard check (Monocrotophos 36 WSC @ 360 g a.i./ha followed by Dimethoate 30
EC @ 521 g a.i./ha) with 11.2 thrips per leaf (Table 2).
At seven days after first spray, Fipronil 80 WG @ 50 g a.i./ha recorded lowest population of 6.2 thrips per leaf
followed by Fipronil 80 WG @ 40 g a.i./ha (6.4 thrips/leaf) and were highly effective against thrips. The latter
treatment was at par with Fipronil 5 SC @ 40 g a.i./ha (7.5 thrips/leaf). The treatments viz., Spinosad 45 SC @
84.375 g a.i./ha, Imidacloprid 200 SL @ 45 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 8.5, 8.8 and 9.6 thrips per leaf, respectively were at
par with each other and were significantly superior to untreated check (Table 2).
At ten days after first spray, Fipronil 80 WG @ 50 g a.i./ha recorded lowest population of 4.2 thrips per leaf
followed by Fipronil 80 WG @ 40 g a.i./ha (4.7 thrips/leaf) and were at par with each other. The next best
treatments included Fipronil 5 SC @ 40 g a.i./ha (6.4 thrips/leaf) and Spinosad 45 SC @ 84.375 g a.i./ha (7.5 thrips/leaf).
The treatments viz., Imidacloprid 200 SL @ 45 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 7.8 and 8.3 thrips per leaf, respectively were at par
with each other and were significantly superior to untreated check in reducing the trips population (Table 2).
2.2.2 Second spray
At three days after second spray, Fipronil 80 WG @ 50 and 40 g a.i./ha recorded lowest population of thrips (3.0
and 3.4 thrips/leaf, respectively) indicating their higher effectiveness as compared to any other treatment. The next
best treatment was Fipronil 5 SC @ 40 g a.i./ha with 5.2 thrips/leaf. The treatments Spinosad 45 SC @ 84.375 g
a.i./ha and Imidacloprid 200 SL @ 45 g a.i./ha with 6.4 and 7.2 thrips per leaf, respectively were at par with each
other. The latter treatment was at par with Standard check (Monocrotophos 36 WSC @ 360 g a.i./ha followed by
Dimethoate 30 EC @ 521 g a.i./ha) with 7.8 thrips per leaf.
At seven days after second spray, Fipronil 80 WG @ 50 and 40 g a.i./ha recorded lowest population of
thrips (2.0 and 2.3 thrips/leaf, respectively) indicating their higher effectiveness as compared any other
treatment. The next best treatment included Fipronil 5 SC @ 40 g a.i./ha with 3.1 thrips/leaf and Spinosad 45 SC
@ 84.375 g a.i./ha with 4.3 thrips per leaf which differed significantly from each other. Imidacloprid 200 SL @ 45 g
a.i./ha with 5.2 thrips per leaf and Standard check (Monocrotophos 36 WSC @ 360 g a.i./ha followed by
Dimethoate 30 EC @ 521 g a.i./ha) with 5.5 thrips per leaf which were at par with each other were significantly
inferior to above all treatments but superior to untreated check.
At ten days after second spray, Fipronil 80 WG @ 50 and 40 g a.i./ha recorded lowest population of thrips (0.6
and 0.9 thrips/leaf, respectively) indicating their higher and equal effectiveness. The latter treatment was at par
with Fipronil 5 SC @ 40 g a.i./ha with 1.33 thrips per leaf. The next best treatments included Spinosad 45 SC @
84.375 g a.i./ha, Imidacloprid 200 SL @ 45 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 1.5, 1.8 and 1.9 thrips per leaf, respectively and were
at par with each other (Table 2).
2.3 The overall efficacy of insecticides and their effect on yield and vines
All the insecticidal treatments exhibited more than 80 per cent protection against thrips. Two sprays of Fipronil 80
WG @ 50 g a.i./ha provided highest protection against thrips (95.6 and 94.5% during first and second year,
respectively) over untreated check followed by Fipronil 80 WG @ 40 g a.i./ha, Fipronil 5 SC @ 40 g a.i./ha,
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 94.5, 90.1, 86.8, 84.6 and 82.4 and
91.8, 88.2, 86.4, 83.6 and 82.7 per cent protection during first and second year, respectively (Table 3). Similarly,
Patil et al. (2017) reported that fipronil 5% SC @ 1.0 ml/l and imidacloprid 17.8% SL @ 0.3 ml/l were
significantly superior with more than 87 per cent reduction of thrips damage over untreated control followed by
spinosad 45% SC @ 0.25 ml/l which recorded more than 73 per cent reduction of thrips damage over untreated
control.
1,2,3,4,5,6,7,8 10,11,12,13,14
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