Stability of Sources of Resistance to Cowpea Aphid (Aphis craccivora Koch, Hemiptera: Aphididae) across Major Cowpea Production Zones in Ghana by Francis Kusi, Jerry A. Nboyine, Patrick Attamah, Justice F. Awuku, Issa Sugri, Mukhtaru Zakaria, Salim Lamini, Gloria Mensah, Victoria Larweh, Robert K. Owusu, Richard Y. Agyare, Julius Yirzagla, Michael Asante, Joseph K. Laary

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