Resistance of Bunch Bean Varieties to the Potato Leafhopper and Relationship Between Resistance and Chemical Articles Control1

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Abstract
Twenty-eight varieties of bunch beans were evaluated for resistance to the potato leafhopper, Empoasca fabae (Harris). Highly significant differences occurred among varieties in damage scores and nymphal counts. Least damaged varieties were Corneli 14, C-14, Top Most, Green Cluster, Topcrop, Pearlgreen, and Tenderpod. The most damaged varieties were State, Black Valentine, Extender, Earliwax, White Half-Runner, Harvester, Tenderlong 15, and Mountaineer. Damage scores and insect counts had a highly significant positive correlation. There was a linear relationship in damage scores between varieties untreated and treated with carbaryl. The slope of the regression line (b = 0.5497) indicates treatment offered about 50% damage reduction regardless of the measure of susceptibility.