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aging in vitro alfalfa mosaic virus alsike alsike clover AMV showing broad bean check virus chlorosis chlorotic spots CMV strain control virus CMV cowpea cross protection cucumber mosaic virus dilution eight viruses epinasty greenhouse hairy vetch Healthy leaf host plants inactivated infected plants infected with AMV inoculated leaves insect transmissibility isolate M-S isolate POV isolate V-3 ladino leaflets Leaves of Nicotiana legumes lesions mosaic virus strain necrotic Nicotiana glutinosa Nicotiana rustica pea aphid pea streak virus pea variety Perfected Wales pea petioles plants inoculated produced local lesions produced systemic mottle red clover second virus severe streak short rods showing systemic stable physical properties stem streak streak symptoms stunting symptoms on pea systemic necrosis temperature tobacco tomato unifoliate leaves upper foliage V-3 showing varieties tested vein necrosis vein-clearing vetch virus isolate 1-7 virus particles Virus Symptoms white clover white sweetclover wider host range wilt virus Wisconsin pea streak WPSV Zaumeyer's zinnia