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The addition of a stilbene optical brightener, Tinopal LPW, at 1% concentration (wt:wt) signiÞcantly reduced the LC 50 of the beet armyworm nuclear polyhedrosis virus (SeMNPV) from 2.9 PIB/mm 2 to 0.02 PIB/mm 2 . Moreover, the LT 50 of SeMNPV was reduced by 34% by the addition of Tinopal LPW. Seven other structurally related stilbene brighteners were also tested as viral enhancers. Five of these brighteners (Tinopal LPW, Blankophor BBH, Blankophor HRS, Blankophor P167, and Blankophor RKH)doi:10.1603/0022-0493-94.2.339 pmid:11332823 fatcat:o5r47awpejgbhpyxfzxbvewjmq