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0729 Influence of SRI on the Incidence of Insect Pests
 

0729 Influence of SRI on the Incidence of Insect Pests

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Presenter: T. Ratna Sudhakar and P. Narsimha Reddy ANGRAU, Hyderabad ...

Presenter: T. Ratna Sudhakar and P. Narsimha Reddy ANGRAU, Hyderabad

Institution: ANGRAU

Audience: 2nd National SRI Symposium, Agartala, India

Subject Country: India

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    0729 Influence of SRI on the Incidence of Insect Pests 0729 Influence of SRI on the Incidence of Insect Pests Presentation Transcript

    • Influence of System of Rice Intensification (SRI) on the Incidence of Insect Pests
      • T. Ratna Sudhakar and P. Narsimha Reddy
      • Principal Scientist (Entom.) and Senior Scientist (Br.)
      • Rice Section, Agricultural Research Institute
      • Acharya N.G. Ranga Agricultural University Rajendranagar, Hyderabad-500 030.
      • Andhra Pradesh
    •  
    • Southern Telangana Zone
      • Districts: 3
      •  Ranga Reddy
      •  Nalgonda
      •  Mahaboobnagar
      • Irrigation source:
      •  Wells, bore wells, tanks, and minor irrigation projects
      Cropping situation: Rice – rice; Rice-fallow; Rice-vegetables Rice – oil seeds; Rice-maize Soils: black clay soils, red loamy soils, chelka soils Rainfall : 700 mm
    • Materials and Methods
      • Irrigation Source: Open well
      • Variety: RNR 23064 during Kharif 2006
      • Tellahamsa during Rabi 2005-06
      • Spacing: 25 x 25 cm for SRI
      • 15 x 15 cm for normal method
      • Insect pests: Whorl maggot, hispa, thrips, stem borer, and gall midge
      • Replications: 7 in Kharif and 6 in Rabi
      • Yield attributes: Number of healthy grains/panicles
      • Number of chaffy grains/panicles
      • Grain yield (t/ha)
    • RESULTS Occurrence of insect pests with SRI & normal methods Contd… Stage Normal SRI Nursery Thrips Thrips Hispa Stem borer Gall midge Whorl maggot Total: 5 1
    •  
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    • Stage Normal SRI Main field Whorl maggot Whorl maggot Hispa Hispa Thrips Thrips Stem borer Stem borer Gall midge Gall midge Leaf folder Leaf folder Cut worms Cut worms Rodents (veg. stage) - Rodents (reproductive stage) Rodents (reproduc-tive stage) 9 8 Total 14 9
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    • Incidence of early-stage insect pests Particulars DAT Normal SRI Whorl maggot-damaged leaves (%) 24 2.0 4.4 Hispa-damaged leaves (%) 24 7.3 4.2 Thrips-damaged leaves (%) 24 31.6 19.9
    • Incidence of stem borer Season Particulars DAT Normal SRI Kharif – 2006 Dead hearts (%) 37 2.1 0.5 - do - 53 4.9 1.9 - do - 68 6.2 6.0 White ears (%) 135 11.7 3.5 Total 24.9 11.9 Mean 6.2 2.9 Rabi 2005-06 Dead hearts (%) 55 28.1 22.8 White ears (%) 86 33.6 10.4 Total 61.7 33.2 Mean 30.8 16.6
    • Incidence of gall midge (%) Season Particulars Time Normal SRI Kharif – 2006 Silver shoots 53 0.3 0.4 - do - - do - 68 0.5 1.3 Total 0.8 1.7 Mean 0.4 0.8
    • Grain yield (t/ha) * Low yield due to cold injury Season Normal SRI Kharif 2006 * 0.21 4.16 Rabi 2005-06 2.25 3.47
    • Meteorological data & sowing time particulars. Meteorological data + Sudden drop in min. temp. between 16 th – 21 st Dec.-06 (9.2 to 9.8 0 C for 5 days ) Particulars Normal SRI Date of sowing 11-8-2006 11-8-2006 Date of planting 11-9-2006 25-8-2006 Date of harvesting 8-1-2007 8-1-2007 Period Mean max. 0 C Mean min. 0 C No. of sunshine hours 1 st – 15 th Nov-06 27.7 19.2 4.9 16 th – 30 th Nov-06 29.6 17.9 7.5 1 st – 15 th Dec-06 29.1 14.6 8.6 16 th – 31 st Dec-06 28.1 12.2 + 8.6
    • Conclusions
      • Less number of insect pests were associated from seed to seed with SRI than with normal methods
      • Damage of whorl maggot was high in SRI. Hispa and thrips incidence was less
      • Stem borer and gall midge incidence was more with SRI at vegetative phase while occurrence of white ears was low
      • Grain yield was more in SRI
      • SRI escaped partially from cold snap and is the best alternative for at-risk locations to escape cold (during November – December) under late-planted conditions, e.g., August, for medium-duration varieties.
    • Future research requirements to generate crop-protection technologies for SRI
      • Nursery protection technologies to protect crop until 25-30 days in main field from early-stage insects
      • Need-based protection against stem borer and gall midge during 35-70 days after transplanting and at reproductive phase
      • Schedule for release of Trichogramma Sp. to manage stem borer at vegetative phase
      • Develop non-pesticide methods for the management of insect pests under SRI
      • Provide low-cost & safe IPM package for SRI
    • Acknowledgements
      • ANGRAU university officers
      • Rice Section staff
      • WWF - for financial support
      • Farmers – for SRI adoption/promotion
    • Thank you