News and Reviews

Slide Set on Biological Control of Plant Pathogens

A Pictorial Guide to Biological Control of Plant Diseases, compiled by J. E. Loper and L. J. Stowell and originally produced in 1992 by The American Phytopathological Society, is currently available for purchase. This slide set is an excellent resource for anyone who needs to describe principles of biological control or show specific examples of plant disease biocontrol.

The slide set consists of 70 full-color slides organized by disease along with the biocontrol strategy for each. Introductory slides provide a definition of biological control and a summary of tactics, and list different mechanisms of biocontrol. Title slides inserted at the beginning of each of the 13 examples list the name of the disease, the pathogen, and the biocontrol. Examples were carefully selected to represent the different biocontrol mechanisms and to include diseases caused by fungi, bacteria, and viruses on a variety of crops and forest tree species.

Modification of cultural practices to control disease is illustrated by the use of green manures to reduce Verticillium wilt of potato, incorporation of organic amendments to avocado orchards to maintain soil suppressiveness to Phytophthora root rot, soil packing to cure Valsa canker disease of apple, and monoculture of wheat to develop soils suppressive to take-all of wheat. Examples of biocontrol through the use of antibiotic-producing antagonists include application of bacteria to wheat seed to control take-all, inoculation of woody plants with Agrobacterium radiobacter to control crown gall, seed treatment of cotton with the fungus Gliocladium virens to prevent Pythium damping-off, and biocontrol of post-harvest brown rot of stonefruits by a bacterium. Competitive exclusion is shown in slides depicting application of spores of a saprophytic fungus to freshly cut pine stumps for prevention of root and butt rot, and control of frost injury with a leaf-colonizing strain of bacteria that fails to nucleate ice. Other mechanisms of biocontrol depicted in this slide set include mycoparasitism, illustrated by biocontrol of lettuce drop by a fungal parasite of sclerotia, the use of fungal strains with reduced virulence for biocontrol of chestnut blight, and cross-protection of citrus against tristeza virus by "vaccinating" scion stock with mild forms of the virus.

The numbered slides are conveniently enclosed in plastic sleeves in a 3-ring binder along with printed legends with a detailed description of each slide. A list of suggested references on the general topic of biological control of plant diseases and for specific diseases is also provided.

This slide set (Item No. 41507) is $115 in the U.S. ($130 elsewhere) and can be ordered from:

APS Press
3340 Pilot Knob Road
St. Paul, MN 55121-2097

or see the APS Press Website.

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