Verticillium wilt in transgenic sugar beet cultivars in Cassia County, ID, 2006

Strausbaugh, C.A. and Camp, S. (2007) Verticillium wilt in transgenic sugar beet cultivars in Cassia County, ID, 2006. Plant Disease Management Reports. 1:p. V114.

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Abstract

Transgenic (resistant to glyphosate) sugar beet cultivars were evaluated in a commercial sprinkler-irrigated sugar
beet field near Heyburn, ID where winter wheat was grown in 2005. The field trial relied on natural infection of Verticillium
dahliae. The plots were planted on 28 Apr to a density of 142,560 seeds/A, and thinned to 47,520 plants/A on 15-20 Jun.
Plots were four rows wide (22-in. row spacing) and 34.5 ft long. The experimental design was a randomized complete block
design with eight replications per cultivar. The field was cultivated on 8 and 20 Jun. The crop was managed by the grower
according to standard cultural practices except for herbicide applications. Transgenic cultivars were sprayed with broadcast
applications of glyphosate at 32 fl oz/A on 30 May and 22 fl oz/A on 27 Jun. The study area was also hand weeded to keep
all plots free of weeds. The percentage of plants with leaves that had dead vein delimited sectors was recorded for the center
two rows on 6 Sep. The center two rows were harvested on 25-26 Sep with the aid of a mechanical topper and small plot
harvester. The sugar content of the beets was determined by the Amalgamated Sugar Co. laboratory, and recoverable sugar
was estimated. Data were analyzed using the general linear models procedure (Proc GLM-SAS), and Fisher's protected least
significant difference was used for mean comparisons.
Yields from this field were below normal for this growing region. Verticillium dahliae symptoms and yield
parameters varied significantly between cultivars. Root shape and root hair proliferation indicated that Beet necrotic yellow
vein virus (BNYVV) also was present in the field although the foliar symptoms of this disease were not particularly evident.
An interaction between BNYVV and V. dahliae may have been present in this field. Based on Spearman's rank correlation
coefficient, the mean values for leaf symptoms were inversely related with those for root yield (r = -0.3667, P = 0.0504) but
not sugar content or estimated recoverable sugar (P = 0.1277 and 0.2182, respectively). Good resistance to V. dahliae exists
in some transgenic cultivars based on the reduction in foliar symptoms. Numerous transgenic cultivars with resistance to
both V. dahliae and BNYVV had better yield parameters than the commercial check cultivars indicating growers should be
able to switch to some of the resistant transgenic cultivars without experiencing yield loss.

Item Type:	Article
NWISRL Publication Number:	1206
Subjects:	Irrigated crops > Sugarbeet > Verticillium wilt
Depositing User:	Users 3 not found.
Date Deposited:	24 Mar 2008 21:32
Last Modified:	24 Oct 2016 15:48
Item ID:	1225
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/1225