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- Author or Editor: D. M. Schaaf x
Alkaline soils in Nebraska reduce crop yields and lower aesthetic values of ornamentals and turf (2). Chlorosis associated with alkaline soils occurs in many plants and influences plant growth and development by reducing photosynthetic efficiency (1). Data for turfgrass species and cultivar growth at high pH would be useful.
The potato leafhopper (PLH), Empoasca fabae Harris is the most important Empoasca species attacking dry beans (Phaseolus vulgaris L.) in North America. The objective of this study was to determine the heritability (h2) of PLH injury based on parent-offspring regression analysis of F3 means on individual F2 plants derived from crosses of pinto `Sierra' (resistant) × great northern `Starlight' (susceptible), and black bean `Tacarigua' (resistant) × `Starlight' (susceptible). Low narrow-sense heritability values of 0.29 ± 0.06 and 0.28 ± 0.10, respectively, were obtained for the above crosses. The low narrow-sense heritability estimates indicated large environmental effects on the expression of PLH injury in dry beans. An allelic test showed that both resistant parents possessed the same genes for resistance.
A trial of 38 cultivare of Kentucky bluegrass (Poa pratensis L.) demonstrated genetic differences to an infestation of bluegrass billbug. The correlation coefficient between injury ratings and billbug larval density in sod samples was r = 0.73. Thatch accumulation was not significantly correlated (r = 0.31) with billbug density.