091 Feeding Preferences of Black-margined Pecan Aphids

in HortScience
Author: William Reid
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  • Pecan Experiment Field, Kansas State University, Chetopa, KS 97336-0247

Field resistance to the black-margined pecan aphid [Monellia caryella (Fitch)] was evaluated for 12 pecan [Carya illinoinensis (Wangen.) K. Koch.] cultivars in 1995 and 19 cultivars in 1999. Each year, aphid populations were sampled from four trees of each cultivar by counting the number of aphids on 10 mid-shoot leaves per tree each week throughout the growing season. On leaves of several cultivars, populations of black-margined aphids peaked above the economic threashold level (20 aphids/leaf) during the month of August in both years. `Pawnee' and `Greenriver' demonstrated field resistance to aphids by maintaining fewer than 10 aphids/leaf throughout the season. `Hirschi' and `Posey' maintained among the highest aphid populations in both years—2 to 5 times higher than threashold levels. By avoiding cultivars susceptible to aphid feeding, growers can avoid aphid-induced yield reductions.

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