Southwestern Entomologist (1998) 23, 97-103

R.O. Curvetto and J.A. Webster (1998)
Resistance mechanisms of PI 240675 rye to biotype F greenbug
Southwestern Entomologist 23 (2), 97-103
Abstract: Previous research identified a rye accession, P.I. 240675, as resistant to greenbug biotypes B, C, E, and F. Rye is crossable with wheat and can be utilized by breeders to develop resistant wheat. The purpose of this research was to select biotype F-resistant seedlings of P.I. 240675 and to compare mechanisms of resistance of P.I. 240675 with those of 'Insave F.A.' rye and 'Century' wheat. The results from all tests showed that P.I. 240675 exhibited the highest level of resistance of the three entries in the study, and had a relatively high degree of antibiosis, antixenosis, and tolerance. The plant resistance index (PRI), which combines values from the three resistance mechanisms, was greatest for P.I. 240675 with a PRI of 10.56, followed by Insave F.A. and Century with values of 1.92 and 1.66, respectively. Although antibiosis to biotype F was detected in Insave F.A., this entry had low levels of antixenosis and tolerance and is not a good source of biotype F resistance. P.1.240675 can be used by plant breeders as a source of resistance to greenbug biotypes B, C, E, and F in rye and species related to and crossable with rye, including wheat.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Schizaphis graminum	Rye (Secale cereale)