Occurrence of nuclear polyhedrosis virus of invasive fall armyworm, Spodoptera frugiperda (J. E. Smith) in Meghalaya, north east India.
This paper reports the occurrence of Nuclear Polyhedrosis Virus (NPV) of invasive American fall armyworm (FAW, Spodoptera frugiperda) in Meghalaya, North East India. Field observations of FAW in maize crop revealed that the Spodoptera frugiperda NPV (SpfrNPV) infected larvae stopped feeding and came out from the whorl on the leaf surface of maize plants. In certain cases, dead caterpillars were found hanging on the maize plants showing symptoms of typical NPV attack. Other diagnostic symptoms include sluggishness, initial lighter colour of the body which later becomes darkened, regurgitation and liquefaction of the body. Dead caterpillars of FAW (showing symptoms of typical NPV infection) were collected from the maize fields. Further detailed studies on the efficacy of SpfrNPV under laboratory and field conditions are warranted to determine its potential against FAW.