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BIOCIDAL ACTIVITY OF TWO MARINE GREEN ALGAL EXTRACTS AGAINST THIRD INSTAR NYMPH OF DYSDERCUS CINGULATUS (FAB.) (HEMIPTERA: PYRRHOCORIDAE)
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2012
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Seaweeds are theextraordinary sustainable resources in marine ecosystem which have been usedtraditionally as source of food, feed and medicine. The biological effects ofthallium Hexane (HE), Chloroform (CH), Methanol (ME) and Water (AQ) extract of Ulvafasciata Delile (UF) and Ulva lactuca Linnaeus (UL) were testedagainst Dysdercus cingulatus (Fab.) third instar nymphs at differentconcentrations (100, 200, 400, 600 and 800 ppm). Tested green algae caused dosedependent mortality. The ME of UF (LC50= 313.59 ppm) and UL (LC50= 399.27 ppm)shows more nymphicidal activity at 96 hrs. It is concluded that methanolextract of both UF and UL possesses nymphicidal, antiovipositional activity,reduced fecundity, hatchability, adult longevity and relative growth rate.However, more detailed studies are essential before recommending them for pestmanagement programme.