Interaction of Nosema pyrausta and Temperature on Ostrinia nubilalis Egg Production and Hatch

Bruck, Denny J.; Lewis, Leslie C.; Gunnarson, Robert D.

doi:10.1006/jipa.2001.5062

Cited by 14 publications

(13 citation statements)

References 9 publications

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“…In laboratory studies in which temperature ÂN. pyrausta infections were investigated it was determined that some heavily infected females died without laying eggs and others laid significantly fewer eggs, making the probability of collecting an infected egg much less than collecting a non infected one (Bruck et al, 2001).…”

Section: Discussionmentioning

confidence: 99%

Dynamics of Nosema pyrausta in natural populations of the European corn borer, Ostrinia nubilalis: A six-year study

et al. 2006

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Nosema pyrausta (Paillot) (Microsporida: Nosematidae) is an obligatory intracellular parasite of the European corn borer, Ostrinia nubilalis (Hu¨bner) (Lepidoptera: Crambidae). This pathogen is maintained in natural populations of O. nubilalis by both horizontal and vertical transmission. The impact of N. pyrausta on fecundity of adults and survival of larvae has been well documented in laboratory and field research. In an extensive study covering a 6 year period at one site, we described the effect of N. pyrausta within O. nubilalis populations in a continuous corn following corn ecosystem. We documented the presence of the pathogen through all life stages of O. nubilalis (egg, larva, pupa, adult), by collecting throughout the crop season and examining each insect stage in the laboratory for the frequency of infection with N. pyrausta. The percentage of infection with N. pyrausta and magnitude of the O. nubilalis population fluctuated throughout generation 1 and generation 2. Both horizontal and vertical transmission played a role in maintaining N. pyrausta in the population in both generations. There were strong correlations between percentage adults with N. pyrausta and percentage larvae with N. pyrausta, and between percentage eggs with N. pyrausta and percentage larvae with N. pyrausta. There was a weak correlation between percentage adults with N. pyrausta and percentage eggs with N. pyrausta. The percentage of insects infected with N. pyrausta was always lowest in the egg.

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Section: Discussionmentioning

confidence: 99%

Dynamics of Nosema pyrausta in natural populations of the European corn borer, Ostrinia nubilalis: A six-year study

et al. 2006

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“…88) In the laboratory, N. pyrausta-infected females laid a significantly reduced number of eggs at low temperatures in comparison to that laid by non-infected insects. 89) These data have been claimed to be useful in predicting O. nubilalis populations.…”

Section: )mentioning

confidence: 99%

Biorational insecticides in pest management

et al. 2008

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We present herein a review article of the latest developments of the biorational approaches in pest management appeared in the literature from 1997 to date. The proposed advantages of the biopesticides including their specificity, safety to non-target organisms, particularly mammals, and utilization in low, sometimes minute, amounts have led to an intensive research program by public and private institutions resulting in an avalanche of reports in attempts to discover and develop newer and safer pesticides, particularly in the past three decades. This review is divided into three main chapters, including microbial insecticides in pest control, utilization of semiochemicals, and botanical insecticides, paying particular attention to those practical approaches that are respectful to the environment.

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“…Analyses for interactions between B. bassiana and N. pyrausta were based on a binominal test, which involved comparing the expected and observed mortalities [29,33]. The expected mortality at a range of concentrations of B. bassiana and N. pyrausta was based on the formula: P E = P 0 + (1 -P 0 )(P 1 ) + (1 -P 0 )(1 -P 1 )(P 2 ) in which P E is the mortality expected from the combination of the two pathogens, P 0 is the control mortality, P 1 is the mortality from B. bassiana alone and P 2 is the mortality from N. pyrausta alone.…”

Section: Methodsmentioning

confidence: 99%

“…However, the timing of infection is important in determining what effect the microsporidium has on its host [27]. Early instars of ECB larvae infected with N. pyrausta form abnormal pupae or adults and infections in later instars result in reduced adult longevity and fecundity [8,22,24,25,28,29]. Furthermore, N. pyrausta can increase ECB larval mortality under stresses such as weather extremes, diapauses, or crowding [6,22,24].…”

Section: Introductionmentioning

confidence: 99%

Effects of combining Beauveria bassiana and Nosema pyrausta on the mortality of Ostrinia nubilalis

2010

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Abstract:We tested the combined effect of the fungus Beauveria bassiana and the microsporidium Nosema pyrausta on the European corn borer larvae, Ostrinia nubilalis, in the laboratory. The first instar of O. nubilalis larvae was the most sensitive to the B. bassiana infection followed by the fifth, second, third, and fourth instar (LC 50 s were 4.91, 6.67, 7.13, 9.15, and 6.51 x 10 5 conidia/ml for the first to fifth instars, respectively). Mortality of each instar increases positively with concentration of conidia. When B. bassiana and N. pyrausta were used in combination, mortality increased significantly in all instars. Relative to the B. bassiana treatment alone, the B. bassiana + N. pyrausta treatment decreased the LC 50 s by 42.16%, 37.63%, 21.60%, 27.11%, and 33.95% for the first to fifth instars, respectively. The combined effects of the two pathogens were mostly additive. However, at the two highest concentrations the pathogens interacted synergistically in the first and second instar. Individuals that survived the B. bassiana and B. bassiana + N. pyrausta treatments and developed into adults had significantly shorter lifespans and females oviposited fewer eggs than non-exposed insects. The effects on the longevity and the egg production were most pronounced at high concentration of B. bassiana conidia. © Versita Sp. z o.o.

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Interaction of Nosema pyrausta and Temperature on Ostrinia nubilalis Egg Production and Hatch

Cited by 14 publications

References 9 publications

Dynamics of Nosema pyrausta in natural populations of the European corn borer, Ostrinia nubilalis: A six-year study

Dynamics of Nosema pyrausta in natural populations of the European corn borer, Ostrinia nubilalis: A six-year study

Biorational insecticides in pest management

Effects of combining Beauveria bassiana and Nosema pyrausta on the mortality of Ostrinia nubilalis

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