STUDY GUIDE FOR PEST CONTROL ADVISERS: NEMATODES

III. PLANT DAMAGE AND FIELD SYMPTOMOLOGY (REVIEW)

A. Symptoms of Foliar and Stem and Bulb Nematodes

1. Describe the plant damage symptoms caused by foliar nematodes on ornamental and strawberry plants. (REVIEW)
2. Describe the general plant damage symptoms caused by stem or bulb nematodes. (REVIEW)

1. Describe the primary aboveground symptoms associated with root-parasitic nematodes on the following:
• a. field and vegetable crops; (REVIEW)
• b. sugarbeets; (REVIEW)
• c. grapevines. (REVIEW)
2. Identify other stresses that can cause the same type of symptoms as root- parasitic nematodes. (REVIEW)
3. Describe the root damage symptoms associated with root-knot nematodes. (REVIEW)
4. List other pests or conditions that can cause root symptoms similar to root- knot nematode damage. (REVIEW)
5. Describe the damage symptoms associated with cyst nematode and root- knot nematode on sugarbeets. (REVIEW)
6. Describe the damage to roots caused by ectoparasitic nematodes. (REVIEW)
7. Describe the common damage symptoms on the roots of trees infested with citrus nematodes. (REVIEW)
8. Describe the damage on roots induced by root-lesion nematodes. (REVIEW)
9. List the nematode species that can induce root proliferation. (REVIEW)
10. Describe the association of root rotting and wilting organisms with root-knot nematode symptoms. (REVIEW)

1. Describe the association between root-knot nematode and Fusarium wilt infection in cotton and tomatoes. (REVIEW)
2. Identify the ectoparasitic nematodes that vector plant viruses and name the virus they transmit. (REVIEW)
3. Identify the nematode associated with the bacterial canker pathogen of stone fruit trees in California. (REVIEW)

1. List the common field symptoms of nematode damage in:
• a. established perennial plantings; (REVIEW)
• b. annual plantings. (REVIEW)
2. Describe and give an example of field conditions that can aggravate nematode problems. (REVIEW)
3. Describe how the following provide general indications that nematodes may be damaging plants in the field:
• a. pockets or irregular spots of poor growth; (REVIEW)
• b. indigenous association with crop and location; (REVIEW)
• c. sampling history; (REVIEW)
• d. history of nematicide usage; (REVIEW)
• e. crop susceptibility. (REVIEW)
4. List the procedures PCAs should follow to identify and confirm a nematode problem. (REVIEW)
5. Describe how PCAs can detect potential nematode problems before planting. (REVIEW)
6. List two examples of economic injury levels for California nematodes. (REVIEW)
7. List the factors to take into account when using quantitative assays to forecast future nematode damage. (REVIEW)

MAIN INDEX