Coconut Red weevil

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Seivier Pest of Coconut

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Coconut Red weevil

  1. 1. Severe Pest of Coconut Coconut Red weevil <ul><li>Presented by: </li></ul><ul><li>Mr.T.Sekaran. </li></ul>
  2. 2. Coconut Red Weevil Scincetific name:    Rhynchophorus ferrugineus (Olivier) Common name:    Red Palm Weevil and/or Asian Palm Weevil and Indian palm weevil
  3. 3. Classification <ul><li>Kingdom: Animalia </li></ul><ul><li>Phylum: Arthropoda </li></ul><ul><li>Class: Insecta </li></ul><ul><li>Order: Coleoptera </li></ul><ul><li>Family: Curculionidae </li></ul><ul><li>Genus: Rhynchophorus </li></ul><ul><li>Species :Rhynchophorus ferrugineus </li></ul>
  4. 4. Life Cycle Pupa     Larva Adult Egg
  5. 5. <ul><li>Egg </li></ul><ul><li>Creamy white </li></ul><ul><li>Oblonge & shiny </li></ul><ul><li>Hatch in 3 days </li></ul><ul><li>2.62 mm long & 1.12 mm Wide </li></ul>
  6. 6. <ul><li>Larvae </li></ul><ul><li>Brown head, white body </li></ul><ul><li>Body is composed 13 segments </li></ul><ul><li>35mm long </li></ul><ul><li>50mm long matured </li></ul>
  7. 7. <ul><li>Pupae </li></ul><ul><li>First cream coloured but later turns brown. </li></ul><ul><li>It’s surface is shiny. </li></ul><ul><li>The Antennae & eyes are quite prominent. </li></ul><ul><li>Average length is 35mm & the width is 15mm. </li></ul>
  8. 8. <ul><li>Adult </li></ul><ul><li>Reddish brown in colour </li></ul><ul><li>35mm long & 10mm wide. </li></ul><ul><li>It has long Rostrum (snout) & Dark spots. </li></ul><ul><li>Head & Rostrum comprise about one third of the total length. </li></ul><ul><li>Female : more slender, curved and a little longer than the male. </li></ul>
  9. 9. Damage <ul><li>Red weevil is one of the most destructive pests of coconut. </li></ul><ul><li>The grubs cause damage inside the stem or crown by feeding on soft tissues. </li></ul>
  10. 10. <ul><li>In case of severe infestation the inside portion of trunk is completely eaten and become full of rotting fibres. </li></ul><ul><li>Many times reddish brown liquid can be seen oozing out from the hole. </li></ul><ul><li>In case of young palms the top withers while in older palms the top portion of trunk bends and ultimately breaks at the bend. </li></ul>
  11. 11. Damage symptoms <ul><li>The female weevil scoops out small holes in the soft tissues of the cut or damaged parts of the coconut palms and deposits eggs there. </li></ul><ul><li>Some times the gnawing sound produced by the feeding grubs will be audible. </li></ul><ul><li>In the advanced stage of infestation yellowing of the inner whorl of leaves occur. </li></ul><ul><li>The crown falls down or dry up later when palm is dead. </li></ul>
  12. 12. Control methods <ul><li>Cultural method </li></ul><ul><li>Biological method </li></ul><ul><li>Chemical method </li></ul><ul><li>Other control method </li></ul>
  13. 13. <ul><li>Cultural Method </li></ul><ul><li>Plant & field Sanitation. </li></ul><ul><li>Destruction of infested plant material. </li></ul><ul><li>Physical methods by preventing entry of weevils through cut ends of petioles and wounds. </li></ul>
  14. 14. <ul><li>Biological control </li></ul><ul><li>Predator: Platymerus laevicollis </li></ul><ul><li>Chemical control </li></ul><ul><li>Trunk injection – systemic insecticides monocrotophos </li></ul><ul><li>Drenching of the crown of infested trees with insecticides. </li></ul><ul><li>Treatment of wounds-filling with insecticide dust </li></ul><ul><li>such as BHC mixed with sandu. </li></ul>
  15. 15. Other Control methods <ul><li>Avoid making cuts on the coconut stem. </li></ul><ul><li>Clean crown regularly. </li></ul><ul><li>Dig and turn the soil deeply around, the coconut trunk in the month of April-May. </li></ul><ul><li>Pick up grubs and kill them. </li></ul><ul><li>Heavily infested trees should be cut down and destroy along with the various stages of the pest. </li></ul><ul><li>Wounds on the trees should be filled with a mixture of 10% carbaryl + sand (1:1) </li></ul>
  16. 17. Refererence <ul><li>WWW.Redweevil.com </li></ul><ul><li>www.ikisan.com/links/tn_coconutInsectManagement.shtml </li></ul><ul><li>www.coconutboard.com </li></ul>
  17. 18. Thank you

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