Engytatus varians as agent for dispersal of Spodoptera exigua nucleopolyhedrovirus
The interaction between the mirid predator Engytatus varians (Distant) and a Mexican isolate (SeSIN6) of Spodoptera exigua multiple nucleopolyhedrovirus (SeMNPV) was examined under laboratory conditions. In a choice test, E. varians females and males demonstrated no preference for virus-infected Spo...
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Veröffentlicht in: | Journal of pest science 2022-09, Vol.95 (4), p.1621-1630 |
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Sprache: | eng |
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Zusammenfassung: | The interaction between the mirid predator
Engytatus varians
(Distant) and a Mexican isolate (SeSIN6) of Spodoptera exigua multiple nucleopolyhedrovirus (SeMNPV) was examined under laboratory conditions. In a choice test,
E. varians
females and males demonstrated no preference for virus-infected
Spodoptera exigua
(Hübner) (Lepidoptera: Noctuidae) second instar compared with non-infected at two different post-inoculation times (48 and 72 h). Similarly, prey search time (5–6 h) did not differ significantly for each type of prey. Bioassays were performed to confirm the viability of occlusion bodies (OBs) from predator’s faces collected at 48, 96, and 144 h after exposure to virus-infected
S. exigua
larvae. The proportion of larval mortality was between 0.20 and 0.62 across all times and both
E. varians
sexes. Another experiment was performed to evaluate the dispersal of SeSIN6 OBs by physical contact with
E. varians
adults on tomato (
Solanum lycopersicum
Miller) leaflets treated with the pathogen.
Engytatus varians
adults were exposed to OB-treated tomato leaflets during 24 or 48 h using a clip cage. After each exposure time, these adults were removed and placed on clean uncontaminated leaflets for periods of 4–48 h. These leaflets were then exposed to groups of
S. exigua
second instars in clip cages. The proportion of virus-induced larval mortality of
S. exigua
(ranging from 0.45 to 1.0) was significantly affected by the duration of exposure of
E. varians
adults on OB-treated or untreated tomato leaflets. Our results reveal the potential of
E. varians
as an agent for the dispersal of SeMNPV OBs. |
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ISSN: | 1612-4758 1612-4766 |
DOI: | 10.1007/s10340-022-01549-6 |