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of phytoseiid mites (Acari: Phytoseiidae) and implications for biological control strategies . Systematic and Applied Acarology , 18 , 297 – 321 . 10.11158/saa.18.4.1 Mo , Y ., Lai , Y ., Zhao , Y.-Y . and Wang , G.-Q . ( 2017 ): One new

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. Kulik , M. M. ( 1995 ) The potential for using cyanobacteria (blue-green algae) and algae in the biological control of plant pathogenic bacteria and fungi . Europ. J. Plant. Pathol. 10 , 585 – 599 . 31

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. Nontarget effects of an introduced biological control agent on deer mouse ecology. Oecologia 122: 121–128. Ruggiero L.F. Nontarget effects of an introduced biological control agent on

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– 126 . Lester , P.J. and R. Harmsen . 2002 . Functional and numerical responses do not always indicate the most effective predator for biological control: an analysis of two

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fungal plant pathogens, a variety of mechanisms contributes to the biocontrol activity of microbes. Cell-wall-degrading enzymes such as β-1, 3-glucanases, cellulases, proteases, and chitinases are involved in antagonistic activity of some biological

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Standardized laboratory bioassays were carried out at the Institute for Biological Control of the Federal Biological Research Center for Agriculture and Forestry to determine the susceptibility of two Colorado potato beetle (CPB) populations to Bacillus thuringiensis ssp. tenebrionis (B.t.t.). The beetles were collected from fields near Darmstadt/Hessen, and Michelfeld/Baden-Württemberg. The Michelfeld population, collected from an ecological farm, was sprayed since 1993, once or twice a year with NOVODOR FC, a formulation of B.t.t. The Darmstadt population was never sprayed with B.t.t. before. Our studies showed that the susceptibility of the larvae (LD 50 values) of the two populations did not differ each other significantly. Although resistance of CPB to B.t.t. under laboratory conditions has already been demonstrated, our presumption is that the resistance development of CPB on the field is probably much slower when the farmer is using crop rotation.

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Bourne, J. M. and Kerry, B. R. (1999): Effect of the host plant on the efficacy of Verticillium chlamydosporium as a biological control agent of root-knot nematodes at different nematode densities and fungal application rates. Soil Biology and

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13 19 Poinar, G. O., Jr. (1979): Nematodes for biological control of insects, CRC Press, Inc. Boca Raton, FL. 1-249. Nematodes for

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Cook R.J.— Baker K.F.:1983. The Nature and Practise of Biological Control of Plant Pathogens.—APS, St.Paul, Minnesota Baker K

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Appl. Environ. Microbiol. 1999 65 3850 3854 Khan, M.R. 2006a. Biological control of cereal

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