Rainfall and crop residue effects on soil dispersion and Beauveria bassiana spread to corn

Bruck, Denny J.; Lewis, Leslie C.

doi:10.1016/s0929-1393(02)00022-7

Cited by 38 publications

(14 citation statements)

References 21 publications

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“…Such organisms, e.g., Beauveria sp., are able to infect a wide range of insects but also survive as soil saprophytes and plant endophytes. The latter phenomenon supports the "bodyguard hypothesis" that proposes that plants may "employ" other organisms to defend themselves (Elliot et al 2000;Wagner and Lewis 2000;Bruck and Lewis 2002;White et al 2002). There may therefore be an ecophysiological similarity to ericoid and ectomycorrhizal fungi in that Beauveria spp.…”

Section: Introductionsupporting

confidence: 67%

Zinc Phosphate and Pyromorphite Solubilization by Soil Plant-Symbiotic Fungi

Фомiна¹,

Alexander²,

Hillier³

et al. 2004

Geomicrobiology Journal

126

123

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Acidolysis, complexolysis and metal accumulation were involved in solubilization of zinc phosphate and pyromorphite by a selection of soil fungi representing ericoid and ectomycorrhizal plant symbionts and an endophytic/entomopathogenic fungus, Beauveria caledonica. Zinc phosphate was much more readily solubilized than pyromorphite. According to the relationship between metal mobilization and pH, acidolysis (protonation) was found to be the major mechanism of both zinc phosphate and pyromorphite dissolution for most of the fungi examined. In general, the more metal tolerant fungal strains yielded more biomass, acidified the medium more and dissolved more of the metal mineral than less tolerant strains. However, B. caledonica 4 excreted a substantial amount of oxalic acid (∼0.8 mM) in the presence of pyromorphite that coincided with a dramatic increase in lead mobilization providing a clear example of complexolysis. Organic acid excretion by fungi was inter-and intraspecific and was strongly influenced by the presence of the toxic metal minerals. When grown on zinc phosphate or pyromorphite, Hymenoscyphus ericae DGC3(UZ) accumulated the lowest metal concentration, but Thelephora terrestris accumulated the highest metal concentration in the biomass. The ability to accumulate water-soluble lead species, representing mainly cytosolic and vacuolar pools, seemed to be connected with pyromorphitesolubilizing ability. B. caledonica 4, which demonstrated the highest ability to dissolve pyromorphite, accumulated the highest watersoluble fraction and total lead concentration in the mycelium. Generally, isolates with a higher zinc-tolerance accumulated significantly less total zinc from zinc phosphate (including the sum of water-soluble and NaCl-extractable zinc) than non-tolerant strains.

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Section: Introductionsupporting

confidence: 67%

Zinc Phosphate and Pyromorphite Solubilization by Soil Plant-Symbiotic Fungi

Фомiна¹,

Alexander²,

Hillier³

et al. 2004

Geomicrobiology Journal

126

123

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“…Trends assume no expansion of plant canopy. Legend: spaced dash 24% viability loss day -1 , dash 6% or 12% viability loss day -1 to the soil beneath the plant canopy (Bruck and Lewis 2002) and thus enhance efficacy. There also seem to be differences among plants in terms of persistence of spores on foliage, differences that may be mediated by leaf cuticle chemistry.…”

Section: Rainfallmentioning

confidence: 99%

Ecological factors in the inundative use of fungal entomopathogens

2009

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Fungal entomopathogens have been developed in numerous countries as biocontrol agents with more than 100 mycoinsecticide products commercially available in 2006. The chief, perhaps sole, use of these mycoinsecticides has been as inundative agents, within a chemical paradigm. Large numbers of propagules are applied in an attempt to overwhelm by brute force many of the factors that keep a pathogen in nonepizootic equilibrium with its host. This review attempts to summarize what we know about the abiotic and biotic factors that affect the efficacy of these mycoinsecticides in both foliar and soil applications. Sunlight, humidity, temperature, and phylloplane-associated factors can affect both immediate efficacy and persistence on plants. Likewise, soil texture-moisture interactions, temperature, and a host of biotic factors can affect mycoinsecticides in the soil. Despite much research, our understanding of these ecological aspects is imperfect, especially in a holistic, dynamic sense.

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“…The cake-based formulation caused 42% mortality among adult banana weevils, but only 6% of adults were infected by applications of conidial powder. These and other studies suggest that field performance of B. bassiana against banana weevils may be constrained by abiotic factors (Hallsworth and Magan, 1999;Nankinga, 1999;Bruck and Lewis, 2002). In addition, the high cost of inoculum production and delivery is a serious bottleneck precluding delivery to farmers (Nankinga, 1999;Gold et al, 2001).…”

Section: Introductionmentioning

confidence: 97%