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

Developing IPM Technologies for Different Rice Ecologies
Developing IPM Technologies
for Different Rice Ecologies
Studies on Components of IPM
Control of field pests by chemicals and its long
term effect in rice environment
Long term pesticide trial
Four formulations of pesticides viz., Cartap @ 1 kg.
a.i. ha -1 @, Chlorpyrifos @ 0.5 kg a.i. ha -1 , Carbendazim
@ 1%, and Pretilachor @ 0.75 kg. a.i. ha -1 along with
untreated control were screened against insect pests of
rice during dry season, 2011. Result of the experiment
revealed that Cartap (Critap 4G) treatment recorded
lowest percentage (4.05%) of dead heart (DH), white
ear head (WEH)(4.0%), gundhi bug damage (9.25%),
leaf folder (LF) damage (3.12%) and highest grain yield
of 5.73 t ha -1 in variety Naveen followed by Chlorpyrifos
(Suban 1.5% dust).
Result of the experiment during wet season, 2011
also revealed that Cartap treatment recorded lowest
percentage of DH (3.87%),WEH (3.62%), gundhi bug
damage (8.75%), LF damage (3.0%) and highest grain
yield of 5.25 t ha -1 in variety Naveen followed by
Chlorpyrifos. All other insecticides were found effective
against yellow stem borer, LF and gundhi bug.
(Table 34). Spider population was highly affected by
the application of Pretilachlor (0.5 spider sweep -1 ) as
compared to control (3.0 spiders sweep -1 ).
Root knot nematode was reduced by 84.3% in Cartap
treated plots followed by Chlorpyrifos (81.6%) whereas,
rice root nematode was reduced by 69% in Chlorpyrifos
treated plots followed by Cartap treated plots (66.3%)
compared to control.
Enumeration of microbial population during wet
season, 2011 indicated that plots treated with Cartap
showed ~20% inhibitory effect to copiotrophs and ~5-
10 % to other microbial population with respect to control.
Other pesticides viz., Chlorpyrifos, Bavistin and
the herbicide Pretilachlor did not affect more than ~5%
microbial population.
Testing of new insecticides against insect pests
Eleven of insecticide formulations viz., Imidacloprid
17.8% @ 300g ha -1 , Sulfoxaflor 24% @375g ha -1 ,
Sulfoxaflor 24% @313 g ha -1 , Thiamethoxam 25%@100g
ha -1 , Applaud (Buprofezin) 25% @ 700ml ha -1 , Acephate
95% SG @ 592 ml ha -1 , Dinotefuron 20% @ 200 ml ha -
Table 34. Long term effect of pesticides on insect pest of rice during dry and wet season, 2011
% Gundhi % Gundhi
bug bug Yield Yield
%DH %DH %WEH %WEH %LF %LF damage damage ha -1 ha -1
Treatment with % dry wet dry wet dry wet dry wet dry wet
a.i. and dose g ha -1 season season season season season season season season season season
Cartap@1kg a.i. ha -1 4.05 3.87 4.00 3.62 3.12 3.00 9.25 8.75
(11.60) (11.35) (11.52) (10.97) (10.15) (9.95) (17.69) (17.19) 5.73 5.25
Chlorpyrifos 4.72 4.12 4.75 4.00 4.00 3.70 9.95 10.12
@0.5kg a.i. ha -1 (12.54) (11.71) (12.58) (11.53) (11.52) (11.08) (18.38) (18.55) 5.42 5.20
Carbendazim @0.1% 7.27 6.35 7.15 6.30 6.12 5.65 13.0 12.87
(15.64) (14.59) (15.50) (14.53) (14.32) (13.74) (21.13) (21.02) 5.31 4.88
Pretilachlor 7.37 6.50 7.25 6.67 6.50 6.10 13.95 13.30
@0.75kg a.i. ha -1 (15.75) (14.72) (15.61) (14.97) (14.76) (14.30) (21.93) (21.38) 5.21 4.53
Control 8.32 8.00 8.27 7.90 7.50 7.97 15.42 14.87
(16.76) (16.42) (16.71) (16.32) (15.88) (16.39) (23.11) (22.68) 4.53 4.26
CD (P=0.05) 0.67 0.39 0.47 0.31 0.83 0.55 0.75 0.76 0.81 0.72
CRRI ANNUAL REPORT 2011-12
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