Fluctuations in Natural Populations of the Leaf miner (Coelaenomenodera lameensis) in Relation to Different Origins of Oil Palm (Elaeis sp.) in South Benin
Preferences of
different oil palm crosses in the station of Pobè in Benin were tested on Coelaenomenoderalameensis by monitoring the natural population
for 7 consecutive years. Experiments monitoring of developmental stages of the
insect were performed on material types Elaeisguineensis and Elaeisoleifera. Observations were
performed every two weeks on leaves of different ranks (25, 17 or 9) depending
on the degree of defoliation by counting the different stages of insect
development on leaflets. The results showed that the evolution of pest density
is a function of species and the origin of the materials being compared. Population
densities of different stages of C.
lameensis were more abundant in the crosses fromYocoboué where average
population indices were higher at all stages of development from early observations.
By contrast, in crosses LaMé, Yangambi and Deli, the
numbers of larvae, pupae and adults were lower. Among these three crosses
infestation was more abundant in LaMé, followed by Yangambi and Deli. E. oleifera
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doi:10.1016/S0304-3800(96)01908-4
