Effects of Clover Yellow Vein Virus and Codinaea fertilis on Growth of White Clover. C. Lee Campbell, Assistant Professor, Department of Plant Pathology, North Carolina State University, Raleigh 27650. James W. Moyer, Associate Professor, Department of Plant Pathology, North Carolina State University, Raleigh 27650. Plant Dis. 67:70-73. Accepted for publication 25 May 1982. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-70.

Clones T7 and T17 of the white clover cultivar Tillman with or without clover yellow vein virus (CYVV) infection were grown in soil either infested or not infested with Codinaea fertilis in closed Saran cages in the greenhouse for 20 wk. All growth components of plants stressed by clipping to 3–5 cm every 14 days were less than those of unclipped plants. Clone T7 was more tolerant of CYVV and C. fertilis infection than was clone T17. Root rot was generally greater in CYVV-infected than in CYVV-free plants. CYVV infection reduced stolon length and number and all plant dry weight measures. C. fertilis infection also reduced certain growth components, but not to the extent CYVV infection did. The overall effects of CYVV and C. fertilis on the growth of white clover appear to be additive.

Keyword(s): reduced yield.