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Variation in the susceptibility of Bombyx mori L. to nuclear polyhedrosis virus when reared on different mulberry genotypes
Author(s) -
SosaGomez D. R.,
Alves S. B.,
Marchini L. G.
Publication year - 1991
Publication title -
journal of applied entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 60
eISSN - 1439-0418
pISSN - 0931-2048
DOI - 10.1111/j.1439-0418.1991.tb00329.x
Subject(s) - biology , bombyx mori , nuclear polyhedrosis virus , larva , horticulture , virus , veterinary medicine , botany , virology , gene , genetics , medicine
The influence of host plant on the susceptibility of silkworm (SW) Bombyx mori larvae to a nuclear polyhedrosis virus (NPV) was investigated. Percent mortality and median lethal time (LT 50 ) of NPV were determined by bioassays. It was possible to determine LT 50 only when SW fed on HN‐64 hybrid. In this case the increase of infection was evident and high contamination in the control was observed. The genotypes “Calabreza” and “Miura” were the most suitable with low percent mortalities (< 50 %). No virus contamination was observed when the control fed on “Calabreza”. Resumo Variação da suscetibilidade de larvas de Bombyx mori ao virus da poliedrose nuclear quando criadas sobre diferentes genótipos de amoreira Foi determinada a influência de diferentes genótipos de amoreira sobre a suscetibilidade do bicho‐da‐seda, Bombyx mori , ao virus de poliedrose nuclear. Os tempos letais médios (LT 50 ) e mortalidades totais foram determinados por bioensaios. A estimativa do TL 50 foi possivel quando as lagartas alimentarem‐se do genótipo HN‐64. Neste caso o aumento da infecção foi evidente e houve maior contaminação na testemunha. Os genótipos “Calabreza” e “Miura” foram os mais apropriados apresentando menor porcentagem de mortalidade (< 50 %). A testemunha alimentada com “Calabreza” näo apresentou contaminação com virus. Zusammenfassung Über Unterschiede in der Empfindlichkeit des Seidenspinners, Bombyx mori L., gegenüber einem Kernpolyeder‐Virus bei Aufzucht an verschiedenen Maulbeer‐Genotypen Die Untersuchungen zeigten, daß eine Bestimmung der LT 50 der B. mori ‐Raupen nur möglich war, wenn die Raupen an dem Maulbeer‐Hybriden HN‐64 fraßen. In diesem Fall war der Anstieg der Virusinfektion sehr deutlich, und es wurde auch in der Kontrolle eine hohe Kontamination beobachtet. Die Genotypen “Calabreza” und “Miura” der Maulbeere waren als Futter am besten geeignet und ergaben die geringste Raupenmortalität (< 50 %). Bei Fütterung der Kontrollraupen mit “Calabreza”‐Blättern wurde keine Viruskontamination beobachtet.