School of Plant and Environmental Sciences

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SPES was formed in 2017 from three departments: Crop and Soil Environmental Sciences; Horticulture; and Plant Pathology, Physiology, and Weed Science.

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Summary of 1982 Weed Control Trials
Hagood, Edward Scott (Virginia Tech, 1982)
This publication contains a summary of selected research trials conducted in 1982 in the area of agronomic crop weed control. It is intended as a means of sharing preliminary results with industry cooperators and weed scientists in adjacent states.
Differentiation of Endothia gyrosa and Endothia Parasitica by Disc Electrophoresis of Intramycelial Enzymes and Proteins
Stipes, R. Jay; Emert, George H.; Brown, Ross D. (Mycological Society of America, 1982)
Mycelial proteins from seven isolates of Endothia gyrosa and five isolates of E. parasitica were extracted from acetone powders, separated on polyacrylamide gels by disc electrophoresis, and then stained for general proteins, esterase activity or 3-glucosidase activity. By simple visual inspection, three different observers separated the twelve uncoded general protein gels into the two species. The enzyme gels of both species were more easily differentiated. Very little or no/3-D-glucosidase and general esterase activities were noted on E. parasitica gels. Although the extract sample load (about 220 /xg protein) was standardized, qualitative and quantitative intraspecific variations were noted; these did not interfere with species differentiation. Protein and enzyme profiles from a 30-yr-old isolate of E. gyrosa compared favorably with new isolates. These data corroborate the separation of the species on the basis of morphology.
1983 Summary of Weed Control Trials for Agronomic Crops
Hagood, Edward Scott (Virginia Tech, 1983)
This publication contains a summary of selected research trials conducted in 1983 in the area of agronomic crop weed control. It is intended as a means of sharing preliminary results with industry cooperators and weed scientists in adjacent states.
A New Pyrenomycete Associated with Metrosideros collina Subspecies Polymorpha (Myrtaceae)
Roane, Martha K.; Fosberg, F. Raymond (Mycological Society of America, 1983)
A new pyrenomycetea ssociated with dying trees of Metrosideros collina (Forst.) Gray subsp. polymorpha (Gaud.) Rock in the drier aspect of the ohia forests of Hawaii is described. Although pathogenicity has not been proven, the evidence gathered so far suggests that under certain conditions the fungus could be pathogenic on ohia lehua.
Summary of 1984 Weed Control Trials for Agronomic Crops
Hagood, Edward Scott (Virginia Tech, 1984)
This publication contains a summary of selected research trials conducted in 1984 in the area of agronomic crop weed control. It is intended as a means of sharing preliminary results with industry cooperators and weed scientists in adjacent states.
The Ultrastructure of Meiosis in Woronina pythii (Plasmodiophoromycetes)
Dylewski, Daniel P.; Miller, Charles E. (Mycological Society of America, 1984)
During cleavage of cystogenous plasmodia, nuclei of Woronina pythii underwent one meiosis I-like division. The division was centric, closed with polar fenestrations, and characterized by the formation of synaptonemal complexes. Pachytene nuclei exhibited nuclear projections which were heretofore undocumented structural modifications of the nuclear membrane. Hypothetical functions of these structures are proposed. During diakinesis, fragmentation of the nuclear envelope occurred at the poles throught he apparent growth of microtubules. Intranuclear membranous vesicles appeared to bud from the inner membrane of the original nuclear envelope during metaphase and anaphase, and coalesced on the surfaces of the separating chromatin masses, thereby forming new daughter nuclear envelopes within the intact original nuclear envelope. Similar descriptions of the spindle apparatus and events relating to nuclear envelope breakdown and reformation have been reported for the mitotic divisions of W. pythii. Nuclei of some mature cysts contained intranuclear cisternae which were continuous with the inner membrane of the nuclear envelope, and these cisternae frequently partitioned the nuclei into two or three separate compartments. The formation of intranuclear cisternae was presumed to result in the eventual fission of nuclei, which may represent functionally the second meiotic division.
Charles Edward Miller, 1925-1984
Johnson, Terry W., Jr.; Dylewski, Daniel P. (Mycological Society of America, 1985)
A professional lifetime is not fulfilled unless one is privileged to have had an associate from whom one learns the necessity of standards. The colleague who teaches by example, gentle cajoling, or outright insistence never to compromise accuracy and precision is indeed one of inestimable value. In his endlessly patient, tolerant, and flexible but exacting way, Charles Edward Miller was such a colleague. Whether one was an established investigator or a novice first testing the waters of mycology before plunging in, the treatment was the same: generous responsiveness and impartiality, a demand for responsible thought and evaluation, and an uncompromising principle that one could never lose face by being accurate.
Summary of 1985 Weed Control Trials for Agronomic Crops
Hagood, Edward Scott (Virginia Tech, 1985)
This publication contains a summary of selected research trials conducted in 1985 in the area of agronomic crop weed control. It is intended as a means of sharing preliminary results with industry cooperators and weed scientists in adjacent states.
Qualitative Determination of Cellulose in the Cell Walls of Verticicladiella procera
Horner, W. Elliott; Alexander, Samuel A.; Julian, Maureen M. (Mycological Society of America, 1986)
The presence of cellulose-containing cell walls has been proposed as a taxonomic character in the genus Ceratocystis Ellis and Halsted (Jewell, 1974; Upadhyay, 1981; De Hoog, 1974; De Hoog and Scheffer, 1984; Benny and Kimbrough, 1980; Harrington, 1981; von Arx, 1974). The significance of this trait derives from its scarcity among the fungi. Among the Eumycota sensu von Arx (1974), cellulose is known to occur only in certain species of Ceratocystis s.l (Bartnicki-Garcia, 1968; Barr, 1983; Upadhyay, 1981). With few exceptions, within Ceratocystis s.l, cellulosic cell walls occur in the same species that have holoblastic conidiogeny, cycloheximide tolerance, and cell walls with rhamnose (Harrington, 1981; Jewell, 1974; Spencer and Gorin, 1971; Upadhyay, 1981). De Hoog and Scheffer (1984) summarize the evidence supporting the disposition of these species in Ophiostoma H. & P. Sydow while retaining species with enteroblastic conidiogeny, sensitivity to cycloheximide and neither cellulose nor rhamnose in their cell walls, in Ceratocystis s.s. This suite of characters' biochemical, developmental/morphological, and metabolic-argue strongly for the segregation of these species into Ceratocystis s.s. and Ophiostoma as accepted by recent treatments (De Hoog, 1974; De Hoog and Scheffer, 1984; Benny and Kimbrough, 1980; von Arx, 1974), supported by Harrington (1981) and used herein.
A Laboratory Miniproject in Plant Disease Diagnosis
Baudoin, Antonius B. (University of California Press, 1986-10)
An exercise in disease diagnosis by proving the pathogenicity of a microorganism following Koch's Postulates is an important part of most plant pathology and some microbiology laboratory courses. Such an exercise fits in general biology teaching as well; it would be a useful part of courses in botany, microbiology and mycology because: (1) the principles for proving pathogenicity are common to pathogens of animals, humans and plants; (2) it provides practice in the methods used to study fungal and bacterial pathogens; and (3) it provides an introduction to microorganisms that cause economically important plant diseases.
On the Conspecificity of Endothia eugeniae and Cryphonectria cubensis
Micales, Jessie A.; Stipes, R. Jay; Bonde, Morris R. (Mycological Society of America, 1987)
Isolates of Endothia eugeniae, a pathogen of clove (Syzygium aromaticum), and Cryphonectria cubensis, a pathogen of eucalyptus (Eucalyptus spp.), were examined with chemotaxonomic techniques, including thin-layer chromatography of fungal pigments and isozyme analysis. The bisanthraquinone pigments skyrin and oxyskyrin were isolated from mycelial extracts of each species. Isolates of E. eugeniae and C. cubensis could not be differentiated by polyacrylamide gel electrophoresis of buffersoluble proteins. The organisms also shared alleles at 16 presumed genetic loci, as detected by isozyme analysis. This study confirms the conspecificity of E. eugeniae and C. cubensis.
Nitrogen and potassium fertilization effects on yield and quality of burley tobacco
Evanylo, Gregory K.; Sims, J. L. (1987)
Field studies were conducted in 1983 and 1984 at Lexington, KY to examine the effects of N and K fertilizer on yield and chemical quality of burley tobacco (Nicotiana tabacum L. cv. Ky 14). Treatments included: NH₄NO₃ at rates of 112, 280, and 448 kg N ha^-1; and two sources (K₂SO₄ and KC1), each at rates of 0, 112, 224, and 448 kg K ha^-1. The following agronomic and chemical characteristics were examined: yield, price, leaf N, P, K, Ca, Mg, Cl, Mo, total alkaloid, and solanesol concentrations. Cured leaf yield, price, and solanesol concentration were strongly influenced by N X K interactions. Each was raised by increasing N rates when no K was applied; however, at higher K levels, increasing N rates resulted in smaller price increases, no yield changes, and reductions in solanesol concentrations. Reductions in cured leaf Mo concentration relative to N, K, and Mg levels with increasing K fertilization beyond 0 kg ha^-1 were exaggerated as N rates were raised. No effect of N rates on total alkaloids or solanesol concentrations were noted while increased K rates increased concentrations of both. Greater cured leaf yields and Mo concentrations were achieved with KC1 than with K₂SO₄. The positive effect of KC1 on Mo concentration at low N application rates was reduced by increased N fertilization suggesting that Mo uptake was enhanced by Cl^_ but reversed at high levels of NO^_₃ application.
Summary of 1988 Weed Control Trials for Agronomic Crops
Hagood, Edward Scott (Virginia Tech, 1988)
This publication contains a summary of selected research trials conducted in 1988 in the area of agronomic crop weed control. It is intended as a means of sharing preliminary results with industry cooperators and weed scientists in adjacent states.
Summary of 1992 Weed Control Trials for Agronomic Crops
Hagood, Edward Scott (Virginia Tech, 1992)
This publication contains a summary of selected research trials conducted in 1992 in the area of agronomic crop weed control. It is intended as a means of sharing preliminary results with industry cooperators and weed scientists in adjacent states.
Establishment and maintenance of quality turfgrass on surface-mined land
Hall, John R. (Virginia Cooperative Extension, 1992)
Provides recommendations for successful turfgrass establishment and maintenance on reclaimed surface-mined land.
Summary of 1993 Weed Control Trials for Agronomic Crops
Hagood, Edward Scott (Virginia Tech, 1993)
This publication contains a summary of selected research trials conducted in 1993 in the area of agronomic crop weed control. It is intended as a means of sharing preliminary results with industry cooperators and weed scientists in adjacent states.
Summary of 1994 Weed Control Trials for Agronomic Crops
Hagood, Edward Scott (Virginia Tech, 1994)
This publication contains a summary of selected research trials conducted in 1994 in the area of agronomic crop weed control. It is intended as a means of sharing preliminary results with industry cooperators and weed scientists in adjacent states.
Summary of 1995 Weed Control Trials for Agronomic Crops
Hagood, Edward Scott (Virginia Tech, 1995)
This publication contains a summary of selected research trials conducted in 1995 in the area of agronomic crop weed control. It is intended as a means of sharing preliminary results with industry cooperators and weed scientists in adjacent states.
Summary of 1996 Weed Control Trials for Agronomic Crops
Hagood, Edward Scott (Virginia Tech, 1996)
This publication contains a summary of selected research trials conducted in 1996 in the area of agronomic crop weed control. It is intended as a means of sharing preliminary results with industry cooperators and weed scientists in adjacent states.
Stabilizing reclaimed mines to support buildings and development
Zipper, Carl E.; Winter, Steven (Virginia Cooperative Extension, 1997)

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