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ARS Home » Plains Area » College Station, Texas » Southern Plains Agricultural Research Center » Crop Germplasm Research » Research » Publications at this Location » Publication #79219
Title: GREENHOUSE AND FIELD RESISTANCE TO YELLOW APHIDS IN THE 'PAWNEE' PECAN

Author
item Thompson, Tommy
item Grauke, Larry

Submitted to: HortScience
Publication Type: Abstract Only
Publication Acceptance Date: 4/30/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary:

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.