Biological control of plant pathogens. What is biological control? . Relation to the biological control of insects Suppression of insect populations by native or introduced enemies. Why use biological control? . Biological control agents are Expensive Labor intensive Host specific - PowerPoint PPT Presentation
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Biological control of plant pathogens
Coiling of Trichoderma around a pathogen.(Plant Biocontrol by Trichoderma spp. Ilan Chet, Ada Viterbo and Yariv Brotman)
borne pathogens such as Pythium,
Rhizoctonia, Fusarium and Sclerotina
(Hubbard et al., 1983. Phytopathology 73:655-659).
(Ilan Chet, Hebrew University of Jerusalem).
----reinforce cell wall to resist infections
Growth inhibition of Pythium ultimum by the Trichoderma virens– produced antibiotic gliovirin: A, parent strain, and B, gliovirin-deficient mutant.
Growth inhibition of Rhizoctonia solani by the Trichoderma virens–produced antibiotic gliotoxin: A, gliotoxin-amended medium, and B, nonamended medium.
Mycoparasitism of Rhizoctonia solani by Trichoderma virens: A, parent strain coiling around host hyphae, and B, mycoparasitic-deficient mutant with no coiling or penetration of host hyphae.
• Control of root and foliar pathogens
• Changes in the microfloral composition on roots
• Enhanced nutrient uptake
• Enhanced solubilization of soil nutrients
• Enhanced root development
• Increased root hair formation