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

Experimental field showing severe YSB damaged and
protected plots during dry season, 2011
for hispa and another at 75 DAT for leaf folder and
standing water application of bio-mixture (Neem,
Karanja & Kochila seed powder @ 25 kg ha -1 at the PI
stage for YSB) and insecticide along with untreated
control. Pest incidence comprised of low incidence of
hispa during last week of July to 3 rd week of August,
moderate to severe incidence of leaf folder during 1 st -
last week of October and low but continuous incidence
of YSB during 3 rd week of September-last week of November.
Hispa and YSB damage (WEH) were negligible
in IPM plots whereas, damage due to leaf folder was
11% as against 45% in untreated control. A yield advantage
of 23.6% was realized under IPM treatment
over untreated control.
During wet season 2011, scented variety Ketkijoha
was grown for evaluation of botanicals against insect
pests. Severe infestation of hispa was recorded with
90.7% leaf damage hill -1 in untreated control towards
2 nd week of September. Coinciding with the initiation
of hispa infestation at 30 DAT foliar spray of 1% neem
oil provided maximum protection of 26.9% leaf damage.
IPM package for hybrid rice
Seed treatment with carbendazim 2 g kg -1 and need
based chemical control were made during the season.
Leaffolder incidence on rice hybrid Rajalaxmi was 9.6%
leaf damage, whereas on Lalat it was 8.5% under protected
condition compared to 16.2% and 18.0% on
Rajalaxmi and Lalat, respectively under unprotected
condition. Indoxacarb @ 30 g a.i. ha -1 successfully controlled
the damage due to leaf folder. Whorl-maggot
damage to the extent of 8.0% was observed on Rajalaxmi
compared to 2.5% on Lalat. Incidence of white ear head
caused by stem borer was 4.5% only, which was below
ETL. The crop was under flood water for four days during
September. Grain yield recorded was 6.4 t ha -1 and
4.9 t ha -1 in Rajalaxmi and Lalat, respectively under
protected condition compared to 6.1 t ha -1 and 3.8 t ha -
1
in Rajalaxmi and Lalat, respectively under no protection.
Dissemination of rice IPM technologies in
farmers’ field
An IPM trial under CRRI-NCIPM collaborative
project was conducted in the farmers’ paddy fields on
variety Pooja during wet season of 2011 at village
Sighmapur, district Cuttack having 35 acres of land
area, where 5 acres plot was kept as control. IPM interventions
were seed treatment with Bavistin @ 2g kg -1
seed, followed by another scheduled granular application
of Cartap 4 G @ 1 kg a.i. ha -1 at 30 DAT. Foliar
application of Bavistin 2 g ltr -1 was also given one week
before panicle initiation stage as a prophylactic measure
against false smut. Plantomycin 1g ltr -1 along with
copper oxychloride 2 g ltr -1 was sprayed just at the appearance
of BLB symptoms during active tillering stage.
Periodical survey for pests and diseases revealed
that the incidences of YSB, LF, false smut and BLB were
ranging from 1-5% in IPM fields except for BLB, where
it was 5-8% as against 5-25% disease and pest incidence
under farmers’ practice. Grain yield recorded
under IPM was 1.3 t ha -1 more than the non-IPM field
(Table 44). The B:C ratio was also more under IPM (3.14)
as compared to farmers’ practice (2.37).
Table 44. Pesticide application, yield and economics
under IPM and farmers’ Practices
Variables IPM FP
No. of Pesticide sprays 2 Nil
Total cost (Rs. ha -1 ) 17320.00 13960.00
Mean Yield (t ha -1 ) 5.3 4.0
Total returns (Rs. ha -1 ) 54399.00 33113.00
Net returns (Rs. h -1 ) 37079.00 19153.00
Benefit Cost Ratio 3.14 2.37
(Total returns/total cost)
(Rate of paddy Rs.1080 - per q)
92 CRRI ANNUAL REPORT 2011-12