Volume 54 Number 4 Article 37
Year 2000 Month 10
Title: Host Plant Resistance to Blackmargined Aphids on Pecan
Authors: T.E. Thompson, L.J. Grauke, and G.S. Sibbett
Abstract:
The blackmargined aphid is a major insect pest of pecan.
Host plant resistance to this insect was tested in two NPACTS (National Pecan Advanced Clone Testing System) tests in California in 1998. Number of aphids per leaf were determined 16 times at weekly intervals. 'Pawnee,' which had been shown
to be resistant in Texas and Georgia, also demonstrated resistance in California.
Aphid populations varied greatly, with the Lagomarsino Test averaging 4.10 aphids per leaf for the season, and the Clark Test
averaging 8.52. Temporal variation in each test was great, with significant clone X date interactions.
Level of host plant resistance in clones was generally unpredictable, based upon parentage.
In pecan
breeding programs, this makes testing of potential clone releases imperative, since predictability of performance based on pedigree has limitations.
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