NEMATOLOGY 100 - FINAL EXAM Name:
(50% of overall grade) December 10, 2001 2 hours
1. (10 points)
Discuss the life cycle, mode of parasitism and survival of the foliar nematode, Aphelenchoides fragariae. What factors govern its importance in greenhouse-grown ferns?
2. (15 points)
Briefly describe the modes of parasitism or predation of the fungi that are antagonistic to nematodes. Provide examples where possible.
3. (15 points)
An enterprising group of UC Davis crop science students decides to finance their college education by producing certain specialty crops for the sale at the Farmers Market. The crops include Chinese cabbage, bok choi, and other crucifers. The crops will be grown in a nearby former sugarbeet field known to have had a history of sugarbeet cyst nematode. What advice will you provide regarding this plan; what management strategies will you suggest?
4. (15 points)
Describe the stimuli, their sources, and the host-plant responses that result in the giant cell feeding sites of root-knot nematodes, Meloidogyne spp.
5. (15 points)
What factors will you consider in developing crop rotation for various nematode groups? Discuss the use of this approach for the lesion nematode, Pratylenchus penetrans, and the potato-cyst nematode, Globodera rostochiensis.
6. (10 points)
Indicate which of the following nematicides are:
(note there may be more than one answer in each case)
7. (10 points)
What have we learned about nematodes in general? Provide potential matches for the following "factoids". (Some letters may be used several times, others may not be used at all. There may be several matches to each factoid).
8. (10 points)
Describe relationships between seed-gall nematodes and bacteria of the genus Clavibacter. What nematodes are involved and which crops or plants are affected? What are the economic consequences?