[Effect of different rates of nitrogenous fertilization and irrigation on population density of Aphis gossypii Glover (Aphididae: Homoptera) on two ornamental plants]
1997
Almaicohi, A.A. | Aldryhim, Y.N. | Alsuhaibani, A.
This study was conducted to investigate the effect of different nitrogen fertilization rates (0, o.5 and 1 g urea/plant) applied to Cosmos sp. and different irrigation rates (30,60,90 cm3/plant) applied to Kochia scoparia on development of Aphis gossypii. The aphid density was significantly higher at rate 0.5 g urea/plant than control. Aphid density was significantly different between 0.5 and 1.0 g urea/plant. There were no significant effect resulting from aphid feeding on the plant height. The flowers of Cosmos sp. increased significantly in non-infested plants compared with infested ones. The aphid density was significantly higher at irrigation rate of 60 cm3/plant/day compared with other irrigation rates. Plant height of Kochia scoparia was decreased significantly in infested plants compared with non-infested ones
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