Nematology 100 Name:
MID-TERM EXAM, 11/01/00
1. (25 points)
2. (15 points)
a. Describe the feeding habits of the sheath nematode, Hemicycliophora arenaria.
b. How are the survival and reproduction of the nematode influenced by environmental conditions?
3. (10 points)
In the table below, provide the following information for each of the nematodes listed (answer by using the appropriate letter).
(ii) Esophagus type
(iv) Virus vector?
(v) Adult female feeding habit?
(vi) Provide a recognized common name.
4. (10 points)
On the field trip you recovered the
ring nematode from an almond orchard. You also studied the nematode in the
Describe the observations and evidence (circumstantial and experimental) that underlie our understanding of the effect of ring nematodes on the susceptibility of almond trees to bacterial canker.
5. (15 points)
(i) What are the functions of a plant root?
(ii) List the ways in which
roots may be damaged by, or respond to,
6. (15 points)
a) Describe the processes of acquisition, retention (retention sites, mechanism and retention period), and transmission of plant viruses by plant-parasitic nematodes.
b) Which genera of nematodes transmit Nepo viruses?
c) Indicate two virus diseases, and the crops affected, that are vectored by species of Xiphinema.
7. (10 points)
Briefly describe a method of separating nematodes from soil that does not require the nematodes to be motile.