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- W2753199758 abstract "The brown cocoa mirid, Sahlbergella singularis Haglund has beenadjudged the most economically important insect pest of cocoa acrossWest African the sub-region. The pest is capable of causing yield lossof about 30% in the first cocoa growing season and up to 70% yield lossin not less than two cocoa seasons if not controlled. This paperpresents the population dynamics of S. singularis in Ibadan, Nigeriaand the interactions between field populations of mirids and densitydependent (natural enemies) and density independent (weatherparameters) factors. One hundred mature cocoa trees were randomlysampled from base to 1.5m Girth at Breast Height (GBH) fortnightly on atwo hectare plantation for adult S. singularis and its natural enemies(Camponotus species, Crematogaster brevispinosa, Oncophylla longinoda,Acantholepis capensis and Palothyreus tarsatus) using standard pr°Cedures. Mirid population and natural enemy abundance were correlatedto monthly weather parameters (Temperature, Relative humidity andRainfall). The population dynamics followed a similar trend over aperiod of three years of study. The population of the pest rapidlybuilt-up in August of each month and this coincided with the period ofthe main cropping season of cocoa, as cocoa trees were in massive podproduction. Weather parameters such as temperature and relativehumidity played a major role in the fluctuations of mirid population.Rainfall did not seem to have any impact on the pest dynamics. Peakrelative humidity data of 88.2%, 84% and 83.5% were recorded in August2004, 2005 and 2006, respectively and the temperature readings declinedaround this period, inadvertently favouring the multiplication of miridnumbers in the field. The roles of density-dependent factors, that is,natural enemies, were observed in the field and reported. Ants ofvarious genera were observed to exert different degrees of predation inthe field, however, there were no parasitoids encountered both in thefield and laboratory throughout the period of this study. Knowledge ofthe seasonal abundance of the pest is important to generate enoughbackground information needed for effective control of mirid inNigeria." @default.
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- W2753199758 date "2010-12-15" @default.
- W2753199758 modified "2023-09-22" @default.
- W2753199758 title "The Population Dynamics Of Thr Brown Cocoa Mirid, SahlbergellaSingularis Haglund In Ibadan, Nigeria" @default.
- W2753199758 hasPublicationYear "2010" @default.
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