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United States Department of Agriculture

Agricultural Research Service

Title: Greenhouse and Field Resistance to Yellow Aphids in the 'pawnee' Pecan

Authors
item Thompson, Tommy
item GRAUKE, LARRY

Submitted to: HortScience
Publication Type: Abstract Only
Publication Acceptance Date: April 30, 1997
Publication Date: N/A

Technical Abstract: Putative resistance to the yellow aphid complex, Monellia caryella (Fitch) and Monelliopsis pecanis (Bissell), in the 'Pawnee' pecan, Carya illinoinensis (Wangenh.) [K. Koch], cultivar was first noted in greenhouse tests by rating cultivars for relative amounts of honeydew on adaxial leaf surfaces. This resistance was confirmed in two field tests monitored from mid-June to mid-October. 'Pawnee' supported significantly lower aphid populations during every rating period when relatively large numbers of these insects were present. 'Navaho' also showed resistance, with 'Desirable' having intermediate resistance and 'Stuart' being very susceptible. Insect populations were also monitored on the four quadrants of each tree, with this quadrant effect being significant in only one test. This test had the highest populations on the West and lowest populations on the East.

Last Modified: 8/19/2014
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