Abstract
Transmission of a nuclear polyhedrosis virus (NPV) was examined in uniformaged and uniform- vs mixed-age populations ofHeliothis zea (Boddie) on caged soybean. Larval collections revealed viral disease outbreaks occurred in all treatments following release of infected larvae (Primary infected larvae). Transmission of NPV in uniform-aged populations was related to the density of primary infected larvae released in the population but not to the size at death of primary infected larvae (P<0.05). In mixed-age populations horizontal transmission in the oldest larvae in the population was equal to that in uniform-aged populations, providing that primary infected larvae in the mixed-aged population were all the age of the oldest noninfected cohorts. As the mixed-age population aged, transmission increased and was generally higher than that in the uniform-aged populations. Transmission was also higher when primary infected larvae were medium sized at death than when small or large at death.
The concentration of virus deposited on foliage and in soil after all larvae had died on plants was related to density of primary infected larvae released. In soil, but not on foliage, the virus concentration was related to the size at death of primary infected larvae released.
Résumé
La transmission d'un virus de polyédroses nucléaires (NPV) a été examinée dans des populations deHeliothis zea (Boddie) de même âge et dans des populations deHeliothis zea d'âges variés relâchées sur du soja en cages. Des collections de larves ont montré des incidents d'infection virale dans tous les traitements après la remise en liberté des larves infectées (les lères larves infectées). La transmission du NPV dans des populations de même âge a été relative à la densité des lères larves infectées qui ont été relâchées dans la population mais n'a pas été relative à la taille, au moment de leur mort, des lères larves infectées (P<0.05). Dans des populations d'âges variés, la transmission horizontale chez les larves les plus âgées de la population a été égale à celle des populations de même âge, à condition que les lères larves infectées dans la population d'âges variés aient été toutes de même âge que les membres noninfectés les plus âgés de la population. A mesure que la population d'âges variés vieillit, la transmission augmente et est, en général, plus élevée que celle des populations de même âge. La transmission a été aussi plus élevée quand les lères larves infectées étaient de taille moyenne au moment de leur mort que lorsqu'elles étaient de taille petite ou grande au moment de leur mort.
La concentration du virus déposée sur le feuillage et dans le sol après la mort de toutes les larves a été mise en corrélation avec la densité des lères larves infectées qui ont été relâchées. La concentration du virus dans le sol, mais pas sur le feuillage, a été mise en corrélation avec la taille, au moment de leur mort des lères larves infectées qui ont été relâchées.
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Published with the approval of the Director, Arkansas Agriculture Experiment Station.
Use of a trade name does not imply endorsement or guarantee of the product or the exclusion of other products of similar nature.
This material is based upon work supported in part by the U.S. Department of Agriculture under Agreement No. CRSR-2-1000.
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Ali, A.I., Young, S.Y. & Yearian, W.C. Transmission of NPV in uniform- and mixed-age populations ofHeliothis zea [Lep: Noctuidae] on caged soybean. Entomophaga 32, 387–397 (1987). https://doi.org/10.1007/BF02372448
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DOI: https://doi.org/10.1007/BF02372448