Abstract
Studies were conducted in screen and field cages on growth inhibition and fruit damage by Epilachna chrysomelina on cucumber. Six population densities (0, 1-, 2-, 3-, 4- and 5-pairs) of the beetle was introduced into separate cages containing 3-weeks old cucumber seedlings and arranged in Completely Randomised Design (CRD) with three replicates. Increased E. chrysomelina density resulted in increased number of days to 50% fruiting in both experiments. Fruit initiation was delayed by 12 days and 7 days in the screen and field caged cucumber respectively at the 5-pairs population density while the number of fruits produced was significantly lower (p < 0.05) as beetle population increased per cage. Regression analysis in both experiments showed that vine length, functional leaf area and number of cucumber produced were a linear function of E. chrysomelina population density. Chi-square (χ2) analysis revealed that the models obtained in both experiments were similar for the parameters tested.
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