Comparative Studies on the Fecundity and Longevity of Neochetina eichhorniae and N. bruchi, Potential Biocontrol Agents of Water Hyacinth


Neochetina eichhorniae Warner and N. bruchi Hustache (Coleoptera:Curculionidae), of South American origin, were introduced into India for biological control of water hyacinth, laboratory studies on fecundity and longevity showed that N. eichhorniae females lived for 142.2 days (range 32-207) and laid 891 eggs (range 150-1254) while N. bruchi laid 681.6 eggs (range 303-918) in 134.2 days (range 59-175). The maximum mean daily egg production per female was 14.2 on the 16th day after emergence in the case of N. eichhorniae and 17.4 on the 14th day in N. bruchi. N. eichhorniae and N. bruchi laid 50% of their eggs by the 9th week, 75% by the 17th and 14th weeks respectively and 90% by the 22nd and 18th weeks respectively.


Water Hyacinth, Eichhornia crassipes, Weed Killers, Neochetina eichhorniae, N. bruchi, Fecundity, Longeity.

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