Dissection of potato leafhopper (Empoascafabae Harris/ Empoasca kraemeriRoss and Moore) damage symptoms in the common bean (Phaseolus vulgaris L.)
2002
Murray, J.D. | Michaels, T.E. | Pauls, K.P. | Schaafsma, A.W.
Typical presentation of potato leafhopper injury in beans includes necrosis at the leaf margins (leaf bum or hopperbum), and downward curling or "cupping" of the leaves. To evaluate potato leafhopper damage a visual score that combines the overall severity of leaf bum, leaf curling and stunting symptoms is usually used. Nonetheless, it may be useful to evaluate these symptoms separately since they be the result of separate mechanisms of damage, inhibited by separate resistance genes. A population of 1 08 recombinant inbred lines (RILs), derived from a cross between a leafhopper-susceptible Ontario cultivar (Bema) and a resistant line (EMP 419) where scored for injury after natural infestation with Empoasca fabae in Canada and Empoasca kraemeri in Colombia. Leaf bum and leaf curl were significantly rank-correlated (0.37-0.74, P<O.OOl) in all environments. However, several RILs consistently exhibited high scores for leaf curl but low values for leaf bum, which suggests that genetic dissection of these characters may be possible.
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