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Pest of okra.

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Pest of okra.

  1. 1. 1.Okra shoot and fruit borer/ spotted fruit borer •S.N. - Earias vitella E. insulana •Family - Noctuidae •Order - Lepidoptera
  2. 2. Mark of Identification •Moth /Adult •E. vitella - pale whitish forewings with a broad greenish band in the middle • E. insulana has completely green forewings. •The adult body length – 1 cm, wing span is about 2.5.cm
  3. 3. E. insulana •Larva – Brown with dorsum showing a white median longitudinal streak. •Pupa – Brown and boat shaped •Adult– Forewing – uniformly silvery green E.Vitella •Egg: egg sky blue in colour •Larva - brownish with white streaks dorsally and pale yellow ventrally •Adult - Forewing – pale with a wedge shaped green band in the middle
  4. 4. E. Insulana E.Vitella
  5. 5. •Economical importance •Serious pest of okra Host plants – Cotton ,okra ,ambadi ,other malvaceous plants
  6. 6. Life history • Eggs - 250 , laid on tender shoot ,flower buds , and young fruits. • Larva - 9 -11 days in summer. 20 days in winter. • Pupa - in tough silken cocoons on plant, soil or the fallen leaves •Life cycle completed - 3weeks in summer ,4 weeks in winter •No of generation - 12/year
  7. 7. Nature of damage •The caterpillar bore in to tender shoot , flower buds and fruits. •Affected shoots wither and dry up . •Flower buds and fruit drop down prematurely. •The fruits remaining on plant get deformed which shows exit holes of the larvae
  8. 8. Okra shoot and fruit borer damage
  9. 9. Management •Set up pheromone trap @ 12/ha. •Collection and destruction of affected fruits. •Release of egg parasiteTrichogramma chilonis @ 1.0 lakh/ha. •Release of 1st instar larvae of green lace wing predator Chrysoperla carnea @ 10,000/ha. •Dust carbaryl 10 % DP @ 25 kg /ha or • Spray Bacillus thuringiensis @ 2 g/lit.
  10. 10. Earias larva damaging fruit
  11. 11. Earias Damage to shoots
  12. 12. Earias Damage to Fruit
  13. 13. Insecticide ml or g/lit Azadirachtin 0.03% WSP (300 ppm) 5.0 g/lit Azadirachtin 5% Neem Extract Concentrate 5.0 ml/10 lit Emamectin benzoate 5 % SG 3.0 g/10 lit Phosalone 35 % EC 1.5 ml /lit Pyridalyl 10 % EC 1.0 ml/lit Quinalphos 25 % EC 8.0 ml/10 lit  Spray any one of the following insecticide
  14. 14. 2.Leaf Hoppers / jassid •S.N - Amrasca biguttula biguttula •Family - Cidadellidae •Order - Hemiptera
  15. 15. Nature Of Damage • Both nymphs and adults suck the sap from underside of leaves injecting toxic saliva. The damage results in • Characteristic hopper burn symptom. • Infested leaves crinkle and show characteristic browning • Attacked plants stunted, fail to bear fruits.
  16. 16. Nymph Of Leaf Hoppers
  17. 17. Control Measures •Removal of affected parts. •A spider Distina albina and a chrysopid, Chrysopa cymbela are predaceous on leafhoppers. •Foliar sprays with dimethoate 2ml/l • spray methyl demeton 2 ml/l • spray fipronil 2 ml/l
  18. 18. Nymphs and adults sucks sap from underside of leaves
  19. 19. Damage symptom on leaves
  20. 20. 3.Whitefly •S.N. - Bemesia tabaci •Family - Aleurodidae •Order - Hemiptera
  21. 21. whitefly
  22. 22. Whitefly - Bemisia tabaci Nymphs Adult
  23. 23. Nature Of Damage •Both nymphs and adults suck the sap from underside of leaves. •As a result, the plant loses its luster. • The adult acts as a vector for yellow vein mosaic virus disease.
  24. 24. Yellowing of entire network of veins.
  25. 25. Stunted Plants andYVMV symptoms
  26. 26. Control measure •Removal of affected plants • Use of yellow sticky traps •spraying with acetamiprid 0.4g/l •Thiamethoxam 0.4g/l • Profenophos 2ml/l
  27. 27. 5.Aphids • S.N. - Aphis gossypii, Myzus persicae • Family - Aphididae • Order - Hemiptera
  28. 28. Aphid
  29. 29. Nature of damage . •Nymphs and adults suck the sap from the leaves •The affected plants turn yellow, get deformed and dry away • Aphids also secrete honeydew on which sooty mould grows, which hampers the photosynthetic activity.
  30. 30. Aphids feeding on okra leaf
  31. 31. Control Measures. • Given under citrus psylla • Seed treatment with imidachloprid • Thiamethoxam 5 kg/seed • Use of yellow sticky trap.
  32. 32. Red Spider Mite • S.N. - Tetranychus telarius • Family - Tetranychidae • Order - Acarina
  33. 33. RED SPIDER MITES Tetranychus urticae
  34. 34. Nature of damage . • Red spider mites are found in large colonies on underside of leaves protected by the silk webbing constructed by the female. • They are polyphagous infesting brinjal, bhendi and bean. • Leaves present a characteristic blotches which become whitish then brown patches appear. • Later the entire affected leaf become discoloured and dried up.
  35. 35. Control Measures. • Spraying with wettable sulphur 3-5 gm/l or • Spray Dicofol 2.7 ml/l • Spray Propargite 3 ml/l twice at 10 day interval are effective. • Spray with 0.2 % Sulphur • Dusting with Sulphur @ 20 -25 kg /ha . • Spray with 0.03 % dicofol or abamectin @ 150 ml /ha .
  36. 36. 7.Leaf roller • S.N. - Sylepta derogata • Family - Pyralidae • Order - Lepidoptera
  37. 37. Leaf Roller
  38. 38. Nature of damage . • Caterpillar fold the leaves from tip to upwards & feed with in green matter •As result , folded leaves wither & dry up •Larvae always found in the leaf fold .
  39. 39. Leaf Roller
  40. 40. Control Measures. • Spray with 0.2 % carbaryl • Dusting with 10% carbaryl.@ 20 kg /ha . • Removal and destruction of leaf fold along with caterpillar.

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