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Millersville University Biology Department |
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Education:
B.S., Lebanon Valley College
M.S., University of Pittsburgh
Ph.D., State University of New York (SUNY)
Courses Taught:
BIOL 100 -- General Biology
BIOL 161/461 -- Microbiology
BIOL Environmental Science
BIOL 241 -- Principles of Ecology
BIOL 345 -- Applied Ecology
BIOL 247 -- Biodiversity
BIOL 424 -- Mycology
BIOL 546 -- Plant Ecology
Areas of Specialization:
Microbiology, Mycology, Population Biology.
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Research Interest(s):
Plants growing with mycorrhizae, a mutually beneficial
interaction of plant roots with specific soil fungi,
are often more vigorous due to increased uptake of mineral
nutrients, such as phosphorus. My students and I conduct
greenhouse and field experiments designed to examine
the importance of the mycorrhizae on agricultural productivity
and the impact of environmental factors on the mycorrhizae.
Lawns in America cover a land area the size of Virginia,
yet relatively few ecologists have studied this manipulated
ecosystem. My students and I conduct experiments to
examine the effects of lawn pesticides on decomposition
of grass clippings, effects of mowing and fertilization
on nutrient leaching, and the effects of mowing on the
diversity of insect populations.
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Selected Publication(s):
1994.
Are crop and weed interaction effected my mycorrhizae?
Journal of Pennsylvania Acad. of Sciences 67:175.
Drenner, D. D., and D. H. Yocom.
1994. Effects of mycorrhizae on competition between
soybeans and weeds. J. of Pennsylvania Acad. of Science
67:181. Hudoch, H. and D. H. Yocom.
1994. The fungi of Southcentral Pennsylvania: a first
look. In At the Crossroads: A Natural History of Southcentral
Pennsylvania (D. Zegers, editor)
1992. Dependence of three Nebraska Sandhills warm-season
grasses on besicular-arbuscular mycorrhizae. J. of
Range Management 46:14-20. Brejda, J. J., D. H. Yocom,
L. E. Moser, and S. S. Waller.
1991. Effect of mycorrhizae and nutrient exchange
on the growth of interacting corn and bean plants.
Bull. Ecol. Soc. Amer. 72(2):297-298. (with D. Weaver)
1991. Effect of VA mycorrhizae on root /shoot ratios
of onion. Mycol. Soc. of Amer. Newsletter 42(1):39.
(with M. McElvaney)
1991. Mycorrhizal fungi increase yields of winter
wheat. In: Keister, D. L. & P. B. Cregan (eds.)The
Rhizosphere and Plant Growth.. Kluwer Acad. Pub.,
Netherlands. p 382. (with M.G. Boosalis)
1987. The effects of prolonged drought on the yield
of mycorrhizal and nonmycorrhizal grain crops. In:
Mycorrhizal in the Next Decade, Practical Applications
and Research Priorities. p 41. (with Boosalis, Flessner,
and Cunningham).
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