Nature and Extent of Damage to Coconut as a Result of Feeding by Stephanitis Typicus (Distant) (Heteroptera : Tingidae)

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dc.contributor.authorMathen, K.
dc.contributor.authorGovindankutty, M.P.
dc.contributor.authorChacko Mathew
dc.date.accessioned2014-07-07T08:37:26Z
dc.date.available2014-07-07T08:37:26Z
dc.date.issued2007-02
dc.description.abstractThe lacebug Stephanitis typicus (Distant), a minor pest of coconut foliage, assumes importance because of its reported role as vector of Coconut Root (wilt) disease. Inoculation of palms in the field and of seedlings under insect proof green house conditions had brought < bout transmission of the disease. The nature and extent of damage to coconut pinnae are discussed here on the basis of feeding marks, histology and chlorophyll content analysis. Both adults and larvae of all stages feed from the lower surface of coconut pinnae, leaving permanent chlorotic spots on the adaxial surface. These yellow scars vary from small pinpricks to large coalesced patches with an average area of 0.112 mm2 under laboratory conditions. The mean number of feeding marks produced by one adult in 24 h was 80. An average area of 8.96 mm3 is therefore dechlorophylled by a single insect per day. With an average count of 490 adults on the crown of a palm, the total area rendered unsuitable for photosynthesis is 4390 mm2/day. The removal of chlorophyll per adult per day is to the tune of 0.24 ug. per gram fresh weight or 0.078 pg./cm2 of leaf. Not only the chlorophyll, but the entire cell contents are drained while feeding; the palisade cells appear to be depleted. A stylet sheath is not made out and evidence of a prominent role of saliva during feeding is little.en_US
dc.identifier.citationIn: Proceedings. PLACROSYM II, UPASI, Ootacamund, 26-27 Jun. 1979. Edited by Venkata Ram and others 1980 p-466-473en_US
dc.identifier.urihttp://hdl.handle.net/123456789/3779
dc.language.isoenen_US
dc.titleNature and Extent of Damage to Coconut as a Result of Feeding by Stephanitis Typicus (Distant) (Heteroptera : Tingidae)en_US
dc.typeArticleen_US

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