Reduction of yield components by barley yellow dwarf infection in susceptible winter wheat and winter barley in Virginia

被引:18
|
作者
Herbert, DA [1 ]
Stromberg, EL [1 ]
Chappell, GF [1 ]
Malone, SM [1 ]
机构
[1] Tidewater Agr Res & Ext Ctr, Suffolk, VA 23437 USA
来源
JOURNAL OF PRODUCTION AGRICULTURE | 1999年 / 12卷 / 01期
关键词
D O I
10.2134/jpa1999.0105
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Five field studies, during 3 yr (1990-1993) and at two locations, were conducted in eastern Virginia to determine the effect of naturally occurring barley yellow dwarf virus (BYDV) infection on yield components of susceptible 'Barsoy' winter barley (Hordeum vulgare L.) and susceptible 'Wakefield' winter wheat (Triticum aestivum L.) At each study site, yield components were compared for grain harvested from 25 disease loci and 25 adjacent asymptomatic areas. Rhopalosiphum padi L. and Sitobion avenae Fabr. aphid populations were monitored weekly by visual inspection of plant leaves and stems. Aphid numbers were low in all studies, with only one site exceeding the economic threshold of 15 aphids/row ft at any time during the season. The BYDV, PAV strain, was present in all five studies; the MAV strain was present at only one location in 1990-1991. Fall infection was predominant and occurred in all studies, with plants showing typical disease symptoms. Symptoms consistent with spring infection were observed in only one study. With few exceptions, fall infection significantly reduced tiller height, head number, seed number, number of seed per head, 1000 seed weight, and yield. Yield components were not equally affected, Seed number, number of seed per head and yield were reduced the most, by 28%, 22%, and 34%, respectively, compared with only about a 5 to 13% reduction in the other components. Spring infection significantly reduced number of seed per head and 1000 seed weight, but not the other yield components.
引用
收藏
页码:105 / 109
页数:5
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