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Difficulties in location and acceptance of phloem sap combined with reduced concentration of phloem amino acids explain lowered performance of the aphid Rhopalosiphum padi on nitrogen deficient barley (Hordeum vulgare) seedlings

K. Ponder ; J. Pritchard ; R. Harrington ; J. Bale | 2000

Effects of nitrogen deficiency in hydroponically grown barley seedlings (Hordeum vulgare L.) on the development and reproduction of the aphid Rhopalosiphum padi (L.) (Hemiptera: Aphididae) were investigated. Plant growth was significantly reduce[...]

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Feeding behaviour of the aphid Rhopalosiphum padi (Hemiptera : Aphididae) on nitrogen and water-stressed barley (Hordeum vulgare) seedlings

K. Ponder ; J. Pritchard ; R. Harrington ; J. Bale | 2001

Electrical penetration graphs (EPGs) were used to examine the probing behaviour of adult apterous Rhopalosiphum padi (Linnaeus) on barley seedlings grown under conditions of nitrogen or water stress. Aphids took significantly longer to reach and[...]

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