Resistance in Common Bean Lines to the Potato Leafhopper

Abstract

Two common bean lines were resistant to nymphal infestation while 28 were intermediate in resistance to mean nymphal attacks. Ten lines exhibited no hopperburn injury while varying in resistance to nymphal attacks indicating a tolerance in beans. Although a comparison of hopperburn ratings and nymphal infestations identify tolerant varieties, nymphal counts are the better method for evaluation of resistance. The hopperburn ratings and mean 1959-60 nymphal counts showed highly significant positive correlation coefficients. Regression coefficients indicated that 0.99 to 2.85 nymphs were associated with each hopperburn class increase of one.