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Crop Protection :: Pests of Citrus

Sap feeders
Citrus aphids 
Black aphidToxoptera aurantii, 
Brown aphidToxoptera citricida

Symptoms of damage
  • Feed on tender foliage and flowers.
  • Transmit tristeza virus disease.
  • Nymphs and adults suck the sap of leaves
  • Wilting and flower dropping
  • Infested leaves - cup shaped and crinkled
  • Growth of the plants is hindered.
Crinkling of leaves

Identification of pest
Adult wingless forms (apterae)   Adult winged forms (alatae)

Management
  • Use yellow sticky trap
  • Spray with methyl demeton (Metasystox) or dimethoate (Rogar) 2ml /lit
  • Use some concinellid beetles and syrphid flies

Citrus Black fly, Aleurocanthus woglumi 

Symptoms of damage
  • The cell sap is sucked from the leaves -  piercing stylet
  •  Leaf curling.
  • Leaves fall off immaturely.
  • Honey dew secrecation development of sooty mould fungus.
  • Leaf turns to black in colour and affects photosynthetic activity of the leaves.
  • Affected trees produce - few blossoms which develop into inspid fruits.
http://www.ikisan.com/Images/cit_im_blcflylf.jpg http://www.ikisan.com/Images/cit_im_blcflylf1.jpg
Black flies on leaf Close-up of Black flies

Identification of pest
  • Nymphs - are flattened, oval in shape and scale like in appearance.
  • Adult - minute insect, shiny black with grey dusting on the body.
  • Wings are extending beyond the tip of the abdomen.
Black fly on leaves

Management
  • Collect and destroy the damaged plant parts along with nymphs, pupa and adults
  • Spray with 2 ml of chloropyriphos per litre of water
  • Ffemale lays eggs on lower surface of leaves in a form of three (15-22 eggs/whorl) whorls
  • The entire plant canopy should be drenched with the solution.
  • Encourage activity of parasitoids, Encarsia sp., Eretomocerus serius and chlysoperla sp.

Citrus psyllid, Diaphorina citri 

Symptoms of damage
  • Both nymphs and adults suck sap from the plants and injection of toxic saliva.
  • Nymphs - are more destructive, crowd on the terminal shoots, buds and tender leaves
  • Excrete honeydew - growth of sooty moulds.
  • Affected plant parts dry and die away
  • It is transmits the "Greening" virus
http://www.ikisan.com/Images/cit_im_psylla.jpg http://www.ikisan.com/Images/cit_im_psylla2.jpg
Psyllid infested plants    Sooty mould on leaves

Identification of pest
http://www.ikisan.com/Images/cit_im_psylla1.jpg
Egg Nymphs Adult
  • Nymphs - are flattened, oval in shape and scale like in appearance.
  • Adult - minute insect, shiny black with grey dusting on the body.
  • Wings are extending beyond the tip of the abdomen.

Management
  • Collect and destroy the damaged plant parts
  • Spraying with systemic insecticides at flush growth periods
  • Encourage the activities natural enemies such as Syrphids and Chrysopids

Mealy bug, Planoccus citri

Symptoms of damage
  • Both nymphs and adults suck the sap from the cells of tender branches and fruits
  • Turn pale colour
  •  Affected plant parts - wilt and dry up
  • Large amounts of honey dew excrete - sooty mould fungus.
  • Fungus covers the foliage and fruits
  • In severe infestation the flowers do not form fruits.
Mealy bug on fruits  

Identification of pest
  • Eggs – are laid in clusters, protective cottony mass

  • Nymphs – are amber coloured with white waxy coating with filaments
  • Adult - Male is winged, long antenna and without mouth parts.
  • Female is wingless, flat body and short, waxy filaments along the margins
Egg mass Adult female and crawlers

Management
  • Collect and destroy the damaged leaves, twigs and stems
  • Debark branches and apply methyl parathion paste
  • Use sticky trap (5cm length) on fruit bearing shoots
  • Spray dichlorvas 0.2% in combination with fish oil rosin soap 25g/lit
  • Single soil application of aldicarb 10G at 50g/tree at the time of pruning
  • Soil treatment with chlorophyriphos apply on the near the tree trunk
  • Spraying of trees with acephate, methomyl, or chlorpyriphos.
  • Field release of Australian lady bird beetle Cryptoleamus montrouizeri 10 per tree

Fruit sucking mothOtheris materna, O. ancilla, O. fullonica

Symptoms of damage
  • Adult pierce the fruit and suck the juice
  • Rottening at the feeding site
  • Fruit dropping
http://www.ikisan.com/Images/cit_im_ftsuck.jpg
Affected fruit

Identification of pest
  Female        Male     
  • Larva – orange blue and yellow spots on velvety dark speckled on the body
  • Adult – stout moth and orange coloured wing
  • Otheris materna – three black spots on the fore wing 

Management
  • Destroy the weed host Tinospora cardifolia and coccules pendules
  • Bag the fruit with polythene bag (500 gauge)
  • Apply smoke to prevent adult moth
  • Trap crop – growing tomato crop in orchards to attract the adult moth
  • Poison bait
    • dilute suspension of fermented molasses and malathion 0.05% (50 EC at 1ml/lit)
  • Use light trap or food lure to attract moths

 Citrus thripsThrips nilgiriensis

Symptoms of damage
Scarring on Fruit Shoot damage         Leaf damage
  • Nymphs and adults lacerate the leaf tissue and suck the sap from fruits
  • Leaf curling
  • Ring like appearance on the fruit         
  • Irregular mottled patches on rind

Identification of pest
  • Adult – yellowish, fringed wing
Egg mass

Management
  • Collect and destroy the damaged plant parts
  • Spraying with systemic insecticides at flush growth periods
  • Encourage the activities natural enemies such as Syrphids and Chrysopid

Cottony cushion scale, Icerya purchasi

Symptoms of damage
  • Nymphs and adults suck the sap from leaves
  • Honey dew excretion
  • Development of sooty mould fungus

Identification of pest
  • White, ribbed masses that hold up to 800 red eggs.
  • Nymphs are red with black legs and antennae.
  • Adults are covered in white hair.
Cottony cushion scale, Icerya purchasi

Management
  • Spray dormant oil in late winter before spring.
  • Spray horticultural oil, if needed, year round.
  • Apply mixture of manure compost tea, molasses, citrus oil.
  • Garlic-pepper tea also helps.
  • Natural predators usually keep this insect in check.
  • Control ants and dust which can give the scale a competitive advantage.
  • Field release of vedalia and Australian ladybugs.

Leaf feeder
Citrus leaf miner, Phyllocnistic citrella

Symptoms of damage
  • Caterpillars are attacked tender leaves and feed on the epidermis
  • Making silvery appearance presence on the lower surface of leaves
  • Leaves – distorted and crinkled
  • Severe attack caused defoliation
  • Encourage the incidence of citrus canker    
http://www.ikisan.com/Images/cit_im_miner.jpg
Serpentine larva Crinkled leaves

Identification of pest
  • Eggs – are minute, flattened presence on the lower side of the midrib
  • Larvae – minute, yellowish or reddish and apodous.
  • Settled down on the edge of the folded leaves
  • Adult – minute moth, black spot at the tip of the fore wing

Management
  • mixed in a litre of water at weekly intervals at the time of emergence of new flush.
  • Spray application of NSKE 5% 

Citrus butterfly , Papilio demolious, P. Polytes, P.helenus

Symptoms of damage
Defoliation Larva feeding
  • Caterpillars prefers on light green tender leaves
  • Feeding voraciously and leaving only the mid-ribs
  • Severe infestation the entire tree gets defoliated.

Identification of pest
  • Early stage larva resembles bird dropping
  • Grown up larva – cylindrical, stout, green and brown lateral bond
  • Adult
    • Dark brown swallowtail butterfly with numerous yellow marking



First instar
Second instar



Third instar
Fourth instar with osmotoria
Life cycle
Grown up larva


Papilio demolious
Papilio polytes

Management
  • Hand pick the larvae and destroy
  • Field release of parasitoids Trichogramme evanescens and Telenomus sp on eggs
  • Brachymeria sp on larvae and Pterolus sp. on pupae. 
 


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