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Evolution and InnovationSave Biodiversity...Rise

Chrysanthemum



Crop: Chrysanthemum

S.N: Dendranthema grandiflora

Family: Asteraceae

Pests

CHRYSANTHEMUM PESTS & INSECTS :

1. Chrysanthemum aphid, Macrosiphoniella sanborniMyzus persicae

Symptoms of damage

  • Nymphs and adults suck the sap from under surface of leaves and terminal shoots.
  • Stunted growth of the plant
  • Curling of leaf
  • Withering of flowers.
 
Green peach aphids on underside of a leaf
 
 

 

Identification of the pest

  • Aphids are black (or) chocolate brown in colouR
nymph
Winged adult

 

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. Thrips, Microcephalothrips abdominalis

 

Symptoms 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

Damaged leaves by thrips
 

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.
  • 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. Mirid bug, Creontiades pallidifer 

Symptoms of damage

  • Nymphs and adults suck the sap from the tender portions of the plant and leaves

Identification of the pest

  • Adult - greenish yellow in colour with transparent light brown wings.

Management of sucking pest

  • Collect and destroy damaged leaves and buds
  • Spray dimethoate 25 EC at 1.5 ml/lit or malathion 2ml/lit.

 



4. Flower feeder, Helicoverpa armigera   

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 fore wings
  • Male – fore wings are green in colour
  • Female – fore wings are brown in colour
Larva
Adult
                              

 

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.
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