stem blight


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stem blight

[′stem ‚blīt]
(plant pathology)
Any of various fungus blights that affect the plant stem.
References in periodicals archive ?
Methods of seedling evaluation for resistance to gummy stem blight have been reported in watermelon (Boyhan et al., 1994; Dias et al., 1996), melon (Cucumis melo L.) (Zhang et al., 1997), squash (Cucurbita pepo L.) (Zhang et al., 1995), and cucumber (St.
In previous studies, there were genetic differences for gummy stem blight resistance among commercial cultivars of watermelon.
lagenarium (Pass.) Ellis & Halst], Fusarium wilt, and gummy stem blight. However, they were much less resistant to gummy stem blight than the resistant parents PI 189225 and PI 271778.
The objective of this study was to evaluate the available USDA-ARS watermelon germplasm collection for resistance to gummy stem blight using commercial cultivars as reference points,
The checks were 51 watermelon cultivars, along with a set of seven cucumber cultivars, to provide reference points for gummy stem blight resistance.
The complete dataset for all the 1332 cultigens tested for resistance to gummy stem blight was submitted to the Germplasm Resources Information Network (http:// www.ars-grin.gov/; verified 12 November 2004) for those interested in particular cultigens.
Plots were rated for ashy stem blight infection at the end of the R-8 growth stage with a 1-to-9 scale similar to CIAT's (Schoonhoven and Pastor-Corrales, 1987).
Ideal high temperature and dry soil conditions occurred each year for natural ashy stem blight epidemics.
In this study, the difference in relative maturity between Dorado (1.7) and XAN 176 (2.0) was slight, so ashy stem blight itself may have caused early maturity of severely infected lines.
Linkage group, estimated map distances between marker loci, and phenotypic variation in disease score associated with QTL identified by single-factor regression analysis (P [is less than or equal to] 0.002) that condition field resistance to ashy stem blight in 79 [F.sub.5:7] RILs (Dorado/XAN 176) tested two separate years.
The quantitative inheritance of disease score in this population suggests high selection intensities, large population sizes, and perhaps multiple environments will be required to phenotypically select for the XAN 176-derived resistance to ashy stem blight segregating in other populations.
If independent, the markers for Mp-1 and Mp-2 and the QTL-linked RAPDs described herein would provide initial tools for testing marker-assisted selection approaches to retaining and combining quantitative resistance traits with qualitative resistance genes for control of ashy stem blight in common bean.