Central Rice Research Institute Annual report...2011-12

1
, Dinotefuron 20% @ 150 ml ha -1 , Acephate 75 SP, @
800 ml ha -1 , Triazophos 40% @ 625g ha -1 with
Monocrotophos (Monocrown) 36 % a.i. i.e. @ 1390 ml
ha -1 were screened against insect pest of rice during
dry and wet seasons of 2011 on variety Jaya. Results of
the experiment revealed that Imidacloprid treatment
recorded lowest percentage of DH (3.3%), WEH (3.33%),
gundhi bug damage (7.16%) and highest grain yield of
5.28 t ha -1 in variety Jaya followed by the treatment
Sulfoxaflor 24% @ 375g ha -1 with yield of 4.96 t ha -1 .
All the insecticides were found effective against yellow
stem borer (YSB) and gundhi bug. In control, YSB damage
was 7.5% DH, 7.63% WEH, gundhi bug damage
was 15.43% and the grain yield was 3.25 t ha -1 (Table 35).
Sulfoxaflor was also tested against BPH, LF and gall
midge under controlled condition. No immediate
knock-down effect or persistent toxicity was observed
against BPH or leaf folder. However, there was low silver
shoot (SS) formation (27%) in comparison to untreated
control (82%) but higher SS in comparison to
Sutathion and Hostathion (Triazophos). When tested
under field condition during dry season of 2012, insecticide
application at high brood emergence (15 DAT)
reduced DH formation initially to a range of 0.2-0.9%
in all the treatments such as Sulfoxaflor (313 and 375
ml ha -1 ), Hostathion (750 and 1250 ml ha -1 ), Sutathion
(750 and 1250 ml ha -1 ) and the check insecticide
Imidacloprid as against 18% DH in untreated control
as evident from the observation at 30 days after transplanting
(DAT). But increasing DH formation towards
50 DAT necessitated another foliar application followed
by one more foliar spray at panicle initiation stage coinciding
with the second brood emergence. Highest
yield advantage of 32 and 37% was obtained at both
Table 35. Testing of new insecticide against insect pests of rice in dry and wet seasons of 2011
% Gundhi % Gundhi
bug bug Yield Yield
%DH %DH %WEH %WEH damage damage ha -1 ha -1
Dose dry wet dry wet dry wet dry wet
Treatment % a.i. g ha -1 season season season season season season season season
Imidacloprid 17.8 300 3.3 3.6 3.33 3.6 7.16 6.5
(10.46) (1093) (10.52) (10.93) (15.52) (14.76) 5.28 5.18
Sulfoxaflor 24 375 3.5 4.06 3.5 3.8 7.43 7.33
(10.78) (11.62) (10.78) (11.24) (15.82) (15.70) 4.96 4.61
Thiamethoxam 25 100 3.7 4.2 3.7 4.1 7.73 8.16
(11.09) (11.82) (11.09) (11.68) (16.14) (16.60) 4.9 4.58
Triazophos 40 625 3.8 4.3 3.86 4.3 8.03 8.66
(11.14) (11.97) (11.34) (11.97) (16.46) (17.12) 4.78 4.56
Monocrotophos 36 1390 4.1 4.6 4.1 4.3 8.4 9.16
(11.68) (12.38) (11.68) (11.96) (16.84) (17.62) 4.65 4.36
Buprofezin 25 700 4.2 4.7 4.2 4.6 8.4 9.4
(11.82) (12.52) (11.82) (12.38) (16.84) (17.85) 4.36 4.23
Acephate 95 592 4.26 4.93 4.46 4.86 8.7 9.6
(11.92) (12.83) (12.20) (12.74) (17.15) (18.05) 4.28 4.18
Dinotefuron 20 200 4.5 4.93 4.7 5.2 8.86 10.0
(12.24) (12.81) (12.52) (13.18) (17.32) (18.43) 4.26 4.11
Acephate 75 800 4.7 5.5 4.9 5.4 9.2 10.4
(12.52) (13.56) (12.79) (13.43) (17.66) (18.81) 4.18 4.00
Dinotefuron 20 150 4.8 5.6 5.26 5.6 9.5 10.63
(12.65) (13.68) (13.26) (13.68) (17.95) (19.03) 4.11 3.95
Sulfoxaflor 24 313 5.1 6.1 5.5 5.8 10.13 11.2
(13.05) (14.3) (13.56) (13.93) (18.56) (19.55) 3.9 3.91
Control Water 7.5 8.53 7.63 8.43 15.43 14.93
(15.89) (16.96) (16.04) (16.87) (23.12) (22.73) 3.25 3.13
CD (P=0.05) 0.23 0.69 0.27 0.37 0.40 0.34 0.61 0.66
84 CRRI ANNUAL REPORT 2011-12