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Pests of Chrysanthemum – Kisan Suvidha
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Pests of Chrysanthemum

Chrysanthemum pests

Pests of Chrysanthemum

Major pests of  Chrysanthemum are:-

1.Chrysanthemum aphid: Macrosiphoniella sanborniMyzus persicae

Chrysanthemum aphid

Symptoms of damage:

  • Nymphs and adults suck the sap from under the surface of leaves and terminal shoots.
  • Stunted growth of the plant
  • Curling of leaf
  • Withering of flowers.

Identification of the pest:

  • Aphids are black (or) chocolate brown in colour

Management:

  • Aqueous spray application of Vercillium lecanii (Vertilec) @ 15 g/lit (108 CFU/g)
  • Application (ultra low volume) of the entomogenous fungus V.lecanii
  • Neem formulations can be used in rotation with regular insecticides
  • Spray any following insecticides malathion 50 EC @ 1 ml/l of water,

 

2.Chrysanthemum Thrips: Microcephalothrips abdominalis

 

Chrysanthemum thripsSymptoms of damage:

  • Infest the flower heads.
  • Lacerating the sepals and petals causing abrasions
  • Heavy infestation – damage to corolla, stamens leading to premature flower drop.
  • It transmits the tomato spotted wilt virus, necrotic spot virus to many floricultural crops.

Identification of the pest:

  • Adult – slender, white to black in colour

Management:

  • Grow resistant varieties like
  • Chandrika, Bangalore Local Yellow Double, M-7, Pankaj and Yellow Star.
  • Field sanitation.
  • Remove weeds that harbour virus from inside and outside the greenhouse.
  • Yellow or blue sticky traps can be used for mass trapping of thrips.
  • Blue traps – more effective for mass trapping than yellow traps.
  • The release of nymphs and adults of predatory minute pirate bug, Orius insidiosus.
  • Spray dimethoate 30 EC @ 1 ml/litre or fenitrothion 50 EC @ 1.0 ml/litre malathion 50 EC @ 2 ml/litre
  • Application of spinosad very effective against thrips.

 

3.Chrysanthemum Flower feeder: Helicoverpa armigera 

okra fruit borer

Symptoms of damage:

  • Caterpillars feed on buds and flowers.

Identification of the pest:

  • Young caterpillar – yellowish white and gradually green in colour
  • Adult – medium sized, light brown and V-shaped speck on the forewings
  • Male – forewings are green in colour
  • Female – forewings are brown in colour

Management:

  • Field sanitation
  • Collect and destroy damaged buds and flowers
  • Set up pheromone traps with Helilure at 15/ha
  • Spray nuclear polyhedrosis virus (Ha NPV) at 500 LE or 1.5*1012 POBs/ha
  • Encourage the activity of parasitoids campoletis and chelonus
  • Spray carbaryl 50 WP 2g/lit.

 

 

Source-

  • TamilNadu Agritech Portal

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