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New Records of some Pests of the Coconut Inflorescence and Developing Fruit and Their Natural Enemies in Sri Lanka

Authors:

L. C. P. FERNANDO ,

COCOS, LK
About L. C. P.
Coconut Research Institute, Lunuwila, Sri Lanka.
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P. KANAGARATNAM

About P.
Coconut Research Institute, Lunuwila, Sri Lanka.
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Abstract

A survey was carried out at Bandirippuwa Estate, Kirimetiyana Estate and at Isolated
Seed Garden, Rajakadaluwa for the pests of coconut inflorescence and developing fruits.
The mite, Dolichotetranychus sp. (Tenuipalpidae) which lives beneath the perianth
and feeds on the epicarp, causes considerable damage to the developing fruit. Bi-monthly
observations on the intensity of infestation of nuts among different forms of coconut
indicated a significant difference among forms in their susceptibility to mite damage.
Pseudococcus cocotis (Maskell) (Pseudococcidae), Pseudococcus citriculus Green
(Pseudococcidae) and Planococcus lilacinus (Cockereli) (Pseudococcidae), when feeding
in large numbers on the peduncle, cause button nut shedding and drying up of the inflorescence.
The parasitoids and predators of these mealybugs recorded for the first time
in Sri Lanka are Promuscidea unfasciativentris Girault (Aphelinidae) Platygaster sp.
(Platygastridae), Anagyrus sp. nr. pseudococci (Girault) (Encyrtidae) Coccodiplosis sp.
(Cecidomyiidae), Cryptogonus bryanti Kapur (Coccinellidae) and Pseudoscymnus sp.
(Coccinellidae).
Several species of scale insects namely, Coccus hesperidum (Linnaeus) (Coccidae)
Aulacaspis sp. (Diaspididae), Pseudaulacaspis cockerelli (Cooley) (Diaspididae), Aonidiella
orientalis (Newstead) (Diaspididae), and Pinnaspis strachani (Cooley) (Diaspididae)
are recorded as minor pests of the developing fruits of coconut. Coccophagus silvestrii
Compere (Aphelinidae), Scymnus sp. (Coccinellidae), Pseudoscymnus sp. (Coccinellidae)
Telsimia ceylonica (Weise) (Coccinellidae), Cryptogonus bryanti Kapur (Coccinellidae)
and Cybocephalus sp. (Nitidulidae) are recorded as their parasitoids and predators.
These natural enemies are probably responsible for the control of these pests in the
field.

doi: 10.4038/cocos.v5i0.2050

COCOS 1987 Vol.5 39-42

How to Cite: FERNANDO, L.C.P. & KANAGARATNAM, P., (2010). New Records of some Pests of the Coconut Inflorescence and Developing Fruit and Their Natural Enemies in Sri Lanka. COCOS. 5, pp.39–42. DOI: http://doi.org/10.4038/cocos.v5i0.2050
Published on 06 Jul 2010.
Peer Reviewed

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