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Major INSECT -PESTS of GUAVA. author:- Tejasri Thota

MAJOR PESTS OF GUAVA

Guava is one crop where pests are not major hindrance through about 80 pests are reported.

  • Tea Mosquito Bug

  • Guava mealy bug

  • Fruit fly

  • Spiralling white fly

  • Fruit borer

  • Bark eating caterpillars

 1.TEA MOSQUITO BUG

SN :- Helopeltis antonii

Family:- Miridae

Order:- Hemiptera 

It is major insect pest distributed in AP , Kerala , Karnataka, Goa, Maharashtra, and TN .

Symptoms of damage:-

  • Scab of fruit surface

  • Black linear scars on twigs

  • Reddish streaks on leaves.



 Management:-

  • Nymphs are parasitized by the nermithid,Agamermis paradecaudata.

  • Application of recommended dose of fertilizers

  • Spray application of monocrotophos 1.6 ml/ litre at fortnightly interval during the fruit development will manage the pest.

  • Regular pruning and shade regulation

  • Yellow sticky trap 40- 50 / hac

2.GUAVA MEALY BUG

SN:- Ferrisia virigata

Family:- pseudococcidae

Order:-Hemiptera

It is other wise called white tailed mealy bug/ striped mealy bug .it is widely distributed species in tropical and sub tropical countries.

Symptoms of damage:-

The tiny small bugs usually suck sap from twigs, leaves and flowers. Infested fruits will have uneven shapes, poor quality, and are susceptible to secondary infections by pathogens.


Management:-

  • Pruning and destruction of the infested twigs.

  • The branches that are touching the ground to be cut and destroyed

  • Periodical raking of basins and application of balanced dose of fertilizers especially N.

  • Arranging the polythene sheet around the stem

  • Spray dichlorovas 1.0 ml/lit or acephate 1.5 g/lit.

3.FRUIT FLY

SN:- Bactrocera dorsalis 

Family :- Tephritidae

Order:- Diptera

B. dorsalis is the most common causes considerable loss to fruit yield.

Symptoms of damage:- 

-Adults and maggots attack semi – ripe fruits

Oviposition punctures on fruits

Maggots destroy and convert pulp into a bad smelling


Discoloured semi liquid mass

  • Premature fruit drop

  • Fruits with exit holes and soft patches are the symptoms of damage 


   Management:- 

1.  Incorporation of carbaryl 10D@50-100g/tree manages the pupa 

2.poison baiting  with mixture of molasses/sugar@200gand malathion 50mlin 2 lit of water kept in small earthen pots in the field attracts and kill the adults .

4. spiralling fruit fly:-

SN :- Aleurodicus dispersus

Family:- Aleurodidae

Order:- Hemiptera

Symptoms of damage:-

Nymphs and adults suck the sap from leaves

Honey dew - development of sooty mould fungus

Yellowing of leaves.

Dropping of affected leaves.

  • management

  • Field sanitation

  • Removal of host plants

  • Installation of yellow sticky traps

  • During heavy infestation - application of imidacloprid 200SL at 0.01% or triazophos 40EC at 0.06%

  • Spray neem oil 3% or NSKE 5%

  • Release of predators viz., Coccinellid predator, Cryptolaemus montrouzieri

  • Release of parasitoids viz., Encarsia haitierrsis and E.guadeloupae

5. FRUIT BORER 

SN:- conogethes punctiferalis

Family:- pyralidae

Order:- lepidoptera

Symptoms of damage:-

  • Caterpillar bores into young fruits

  • Feeds on internal contents (pulp and seeds)

  • Dry up and fall off in without ripening


Management:-

  • Collect and destroy damaged fruits

  • Clean cultivation as weed plants serve as alternate hosts

  • Use light trap @ 1/ ha to monitor the activity of adults

Insecticides: malathion 50 EC 0.1% two rounds, one at flower formation and next at fruit set.

6.BARK EATING CATERPILLARS.

SN :- Indarbella sp

Family:- Metarbelidae

Order :- lepidoptera

Symptoms of damage:-

  • Young trees may succumb to the attack.

  • Caterpillars bore into the trunk or junction of branches.

  • Presence of gallery made out of silk and frass.

  • Caterpillars remain hidden in the tunnel during day time come out at night and feed on the bark.


Management:-

  • Remove and destroy dead and severely affected branches of the tree

  • Remove alternate host, silk cotton and other hosts

  • Swab Coal tar + Kerosene @ 1:2 or Carbaryl 50 WP 20 g / l of water on the basal portion of the trunk up to 3 feet height

  • Scraping the loose bark to prevent oviposition by adult beetles.

  • Padding with monocrotophos 36 WSC 10 ml in 2.5 cm /tree soaked in absorbent cotton.

  • If infestations are severe then apply the copper oxychloride paste on the trunk of the tree.

  • Hook out the grub from the bore hole

  • After apply monocrotophos 36 WSC 10 to 20 ml/ hole

  • One celphos tablet (3 g aluminum phosphide) per hole

  • Apply carbofuran 3G 5 g per hole and plug with mud.



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