Titlebook: Biological Control of Plant Diseases; Progress and Challen E. C. Tjamos,G. C. Papavizas (Research Leader),R. Book 1992 Springer Science+Bu

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The Weakening Effect as a Trigger for Biological Control and Criteria for Its Evaluationsuch a sublethal treatment (which initially causes only a partial reduction of pathogen population) lead, at a later stage, to a reduction in inoculum density and inoculum potential. In this presentation we shall place the emphasis on soilborne pathogens although the major concepts are relevant also to foliar pathogens.

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Competition for Carbon in Soil and Rhizosphere, a Mechanism Involved in Biological Control of Fusari to nutrient competition between pathogenic and nonpathogenic . (Alabouvette et al., 1984). Recently, Mandeel and Baker (1991) examined the possibility of the association of this mechanism with biological control of Fusarium wilt of cucumber by two nonpathogenic strains of ..

Badger

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Key Factors in the Development of Fungal Agents for the Control of Cyst and Root-Knot Nematodes survival of the agent in soil or data on the numbers of nematodes infected and killed (Kerry, 1990a). There is a need for in depth studies of model systems using agents with different modes of action to determine the key factors involved in the biological control of specific nematode pests.

GRAZE

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1991. The twenty-eight more comprehensive papers represent the key subjects of the ARW covered by invited speakers. The thirty-four short papers pre­ sented in a research format are contributions of those invited to participate in the ARW. There was a total of 70 participants from 21 countries. The

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Die Geschichte vom Bambussammler,In fact, antagonistic organisms usually do not act suddenly and drastically on their prey or target organism because they need some time to develop an epidemic and are affected by the environmental conditions.