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Influence of System of Rice Intensification (SRI) on the Incidence of Insect Pests

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

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Influence of System of Rice Intensification (SRI) on the Incidence of Insect Pests

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  1. Influence of System of Rice Intensification (SRI) on the Incidence of Insect Pests T. RatnaSudhakar 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

  2. 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

  3. 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)

  4. RESULTSOccurrence of insect pests with SRI & normal methods Contd…

  5. Incidence of early-stage insect pests

  6. Incidence of stem borer

  7. Incidence of gall midge (%)

  8. Grain yield (t/ha) * Low yield due to cold injury

  9. Meteorological data & sowing time particulars. Meteorological data + Sudden drop in min. temp. between 16th – 21st Dec.-06 (9.2 to 9.80 C for 5 days)

  10. 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.

  11. 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

  12. Acknowledgements • ANGRAU university officers • Rice Section staff • WWF - for financial support • Farmers – for SRI adoption/promotion

  13. Thank you

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