Selection of a UV-tolerant Strain of the Gypsy Moth, Lymantria dispar (L.) (Lepidoptera: Lymantriidae) Nucleopolyhedrosis Virus

1984 
Gypsy moth nucleopolyhedrosis (NPV) was exposed to ultraviolet (UV) radiation for periods of 0 to 240 min. During the first five UV exposures (and passages) little change in UV tolerance occurred, as measured by biological activity of UV-exposed and nonexposed virus or by viral inactivation time. During the first five UV selection steps (UV no. 1–5), 22% of original viral activity remained after a 60-min exposure period. At the sixth exposure, however, 56% of original viral activity remained, i.e., a 2.5-fold increase in viral persistence. During the succeeding UV exposures, viral persistence remained stable. Although an increase in UV tolerance occurred during the sixth UV exposure (60 min), little change in activity of the selected virus occurred. Although no change in UV tolerance occurred during the 240-min UV exposures, activity increased during the sixth UV treatment, but was still 2.4-fold less than that of the nonirradiated, control NPV.
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