Abstract

                                Urdbean leaf crinkle disease (ULCD) caused by an ungrouped virus is a destructive and serious disease of urdbean(Vigna mungo (L.) Hepper). Urdbean is commonly infected by leaf crinkle disease and is distinguished by the symptoms of extreme crinkling, curling, puckering, rugosity of leaves, stunting of plants and malformation of floral organs. An intensive survey was conductedduring the year of2018-2019 in major blackgram growing districts of Tamil Nadu viz., Pudukkottai, Tiruchirappalli,Villupuram, Tenkasiand Coimbatore. The highest disease incidence was recorded in Pudukkottai (24.95%) and lowest incidence was recorded in Coimbatore (17.89%).The transmission of ULCD by seed sprout abrasion and sap inoculation methods was 70.59% and 63.30% respectively. The transmission of ULCD by infected seeds was ranging from 71.89 to 83.62%.

Key words : Urdbean leaf crinkle disease(ULCD); Survey; Mechanical ; Seed transmission