Studies on Caryedon serratus (Coleoptera:Bruchidae) affecting stored groundnut [Sudan]
1996
Abdalla, I.I.
Caryedon serratus (Ol.) is the main cause of losses in stored groundnut (Arachis hypogaca) in Western Kordofan State (En-Nahud area). Studies of its biology, and infestation development and damage were conducted under laboratory storage conditions at the Faculty of Agriculture, University of Khartoum Shambat. Three groundnut varieties; Ashford, Sodari and Barberton (shelled and unshelled) were used in this study. Adult insects mate soon after emergence; egg laying was generally more on unshelled varieties than on shelled. Roughness of pod surface, oil content of the seeds and their smooth surfaces were observed as factors affecting the attraction of female insect for egg-laying. More larvae devloped from eggs adhering to the shell than from those laid on smooth seeds which were dislodged. Oil contents had also adverse effect on development. An index of susceptibility to infestation was calculated taking care of percentage survival per female eggs and it's mean development period on each variety. This indicated that the most susceptible variety among unshelled groundnut was Barberton followed by Ashford and Sodari respectively. Among the shelled groundnut, the sequence of susceptibility was Ashford, Barberton and Sodari. This last variety and type was the least susceptible to infestation and caused high mortality of immature stages. An examination of weight loss in the same mentioned varieties stored for nine months was done at an interval of four weeks. This showed that unshelled Ashford lost weight more than unshelled Barberton and unshelled Sodari respectively. Weight loss in shelled groundnut was higher in Ashford followed by Barberton and Sodari varieties
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