Nematology 100
                Final Examination, December 14, 1987                   
   (2 hour exam, 100 points total)
   I found the first 3 questions on a page labelled "Plant Nematology 118, 
   Examination May 28, 1958".  It predates even my association with the 
   field, but I thought the questions were interesting.
   (15 points)
   1.  Ditylenchus dipsaci, Ditylenchus destructor, and Ditylenchus angustus
   are parasites of plants.  Name at least one host plant of each and 
   indicate the part of the plant where you would expect to find each of the
   nematode species.
   (10 points)
   2.  A plant variety resistant to a Fusarium sp loses its resistance when 
   planted in a particular field in Louisiana.  The resistant variety 
   performs well and retains its resistance in this field when the soil is 
   treated with Chloropicrin. Describe in detail the experiments that you 
   would undertake to determine the cause of the loss of resistance.
   (10 points)
   3.  Assuming that Radopholus similis was found attacking citrus on 100 
   acres of citrus trees in groves in widely separated parts of California, 
   what measures would you take against this parasite if you were in charge 
   of a project designed to limit its spread and eliminate it from infested 
   groves? (Ferris addendum: what do you think about such a program?)
   (16 points)
   4.  Briefly describe the technique that you would use to detect the 
   following nematodes:
   a. Globodera rostochiensis in fallow soil
   b. Meloidogyne incognita on cotton at mid growing season
   c. Pratylenchus vulnus on bare root walnut nursery stock
   d. Meloidogyne spp in fallow soil
   e. Anguina tritici in wheat seed
   f. Xiphinema americanum in an apple orchard
   g. Ditylenchus dipsaci in garlic cloves
   h. Mesocriconema xenoplax in a peach orchard
   (30 points)
   5. Briefly discuss the economic importance, distribution, host range, 
   injury to host, relation to host tissue, biology as influenced by 
   physical environment, and control of the following:
   a. Bursaphelenchus xylophilus 
   b. Hemicycliophora arenaria 
   c. Xiphinema index
   (20 points)
   6. Match the following. (Some letters may be used several times, others 
   may not be used at all.  There may be several answers to each question).
   _________1. Animal parasite              a) Caenorhabditis elegans
   _________2. Can be cultured axenically   b) Xiphinema index
   _________3. Predator                     c) Ditylenchus destructor
   _________4. Microbivorous                d) Acrobeloides spp
   _________5. Chemically mediated sex      e) Seinura sp
               attraction                   f) Pseudomonas solanacearum
   _________6. Virus transmission           g) Radopholus similis
   _________7. A-rated pest (California)    h) Trichinella spiralis
   _________8. Migratory endoparasite       i) Globodera rostochiensis
   _________9. Order Tylenchida             j) Ascaris suum               
   _________10.Nematode/bacterium interaction
   (4 points)
   7. Match the following:
   _________1. W.B. Hewitt, D.J. Raski,  a) 1913-1932 leader in the field of
               and A.C. Goheen              nematology in U.S.
   _________2. N.A. Cobb                 b) reported the occurrence of a
   _________3. B.G. Chitwood                cyst nematode on sugarbeet in
   _________4. J.R. Christie and V. Perry   Germany in 1859.
   _________5. M.J. Berkeley             c) Pictorial key of plant nematodes.
   _________6. H. Schacht                d) First report of transmission of
   _________7. J.N. Sasser                  plant viruses by nematodes.    
   _________8. W.F. Mai                  e) First demonstrated pathogenicity
                                            of the ectoparasite, Trichodorus. 
                                         f) Separated Meloidogyne spp on the  
                                            basis of host differentials.
                                         g) Separated Meloidogyne spp on the
                                            basis of cuticular markings.
                                         h) Reported galls on cucumber roots
                                            in England.
Return to Nematology 100 Menu