Claim: Raoul A. Robinson (born September 25, 1928) refined the definition of horizontal resistance, which contrasts with the term vertical resistance which was used to describe single-gene resistance.
Evidence: Raoul A. Robinson (September 25, 1928 in Saint Helier, Jersey - 25 July 2014) was a Canadian/British plant scientist with more than forty years of wide-ranging global experience in crop improvement for both commercial and subsistence agriculture. Raoul A. Robinson further refined the definition of horizontal resistance. This contrasts with the term vertical resistance which was used to describe single-gene resistance. The term vertical resistance, used commonly in context of plant selection, was first used by J.E. Vanderplank to describe single-gene resistance. This contrasted the term horizontal resistance which was used to describe many-gene resistance.