NEMATOLOGY 100 - FINAL EXAM Name: December 14, 1994 2 hours (50% of overall grade) 1. (10 points) What features would you design into a nematode species to enhance its success in an annual cropping system? Discuss these characteristics in relation to the sugarbeet cyst nematode and the dagger nematode. 2. (12 points) On December 8, 1994 the California Department of Pesticide Regulation announced that permits will be issued in 13 counties for the use of Telone II nematicide. a) What type of nematicide is Telone and how does it move through soil? b) If you were asked to designate three California crops that you considered to have highest priority for use of this nematicide, what would they be, and why? c) What are the target nematode species in the case of each of your designated crops? d) Discuss the pros and cons of using the nematicide in situations where it has not been used since 1990. 3. (10 points) Discuss resistance to desiccation as a nematode survival mechanism. Use examples of genera, species, life stages, and feeding habits where it may be important. Consider the agricultural significance in each case. 4. (10 points) 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 or human parasite a)Caenorhabditis elegans _________2. Can feed on fungi b) Longidorus africanus _________3. Predaceous nematode c) Ditylenchus destructor _________4. Bacterial-feeding nematode d) Heterorhabditis bacteriophora _________5. Host-mediated egg hatch e) Mononchus sp _________6. Sedentary endoparasite f) Sheath nematode _________7. Virus transmission g) Rotylenchulus reniformis _________8. A-rated pest (California) h) Wucheria bancrofti _________9. Migratory endoparasite i) Soybean cyst nematode ________10. Order Tylenchida j) Meloidogyne hapla 5. (10 points) Describe relationships between seed-gall nematodes and bacteria of the genus Clavibacter 6. (10 points) Describe current understanding of the glandular activity and glandular secretions of root-knot nematodes with regard to stimulating and maintaining giant cells. 7. (10 points) Radopholus similis is an important parasites of bananas in Central America. What type of damage will they cause? How are the nematodes and their damage managed? 8. (8 points) What factors will you consider in developing crop rotation sequences for plant- parasitic nematodes in the genus Meloidogyne and the genus Heterodera. 9. (10 points) Describe the proposed causality of bacterial canker of peach in California. 10. (10 points) Briefly describe the modes of capture/infection of nematodes by their fungal parasites. Provide an example of a fungus genus in each case.