STUDY GUIDE FOR PEST CONTROL ADVISERS: NEMATODES

V. MANAGING NEMATODE PROBLEMS

A. General Strategies

1. Define damage threshold. (REVIEW)
2. Describe the factors that influence the damage threshold for nematodes. (REVIEW)
3. List the resources for finding out methods for controlling nematodes in specific crops. The UCIPM Pest Management Guidelines
4. Describe the role of the California Nursery Certification program in preventing the spread of nematodes. (REVIEW)
5. List methods used to prevent the spread of nematodes. (REVIEW)
6. Describe the importance of cleaning equipment to limit the spread of nematodes. (REVIEW)
7. Describe the feasibility of eradicating 100% of the nematodes from a field. (REVIEW)

1. Describe how crop rotations can be used to manage nematode populations. (REVIEW)
2. Identify an example of a successful crop rotation program against a nematode pest in California. (REVIEW)
3. Describe the use of degree-day models and how the manipulation of planting or harvest dates can be used to limit nematode damage. (REVIEW)
4. Describe the role of weed control in rotation programs for nematode pest management. (REVIEW)
5. Describe the impact of solarization on nematodes. (REVIEW)
6. Describe how soil amendments can be used to reduce nematode damage. (REVIEW)
7. Define 'replant problem'. (REVIEW)
8. Describe how cover crops can impact nematode problems. (REVIEW)
9. List four types of organisms known to attack nematodes in the soil. (REVIEW)

1. Define:
• a. resistance; (REVIEW)
• b. tolerance; (REVIEW)
• c. biotype. (REVIEW)
2. Differentiate between host resistance and tolerance. (REVIEW)
3. List the factors that need to be considered when determining whether to plant a nematode resistant cultivar. (REVIEW)
4. Describe and give examples of:
• a. immune plants; (REVIEW)
• b. susceptible host plants; (REVIEW)
• c. nonhost plants; (REVIEW)
• d. resistant plants; (REVIEW)
• e. tolerant plants; (REVIEW)
• f. intolerant plants. (REVIEW)
5. Describe the impact of biotypes or host races on nematode control. (REVIEW)
6. Describe the benefits and limitations of using nematode resistant varieties in tomatoes. (REVIEW)
7. Describe how to prevent nematodes from overcoming host plant resistance. (REVIEW)
8. Describe the importance of crop rotation when using resistant cultivars in alfalfa. (REVIEW)
9. Describe the role of tolerant rootstocks and resistant cultivars in limiting economic damage from nematodes. Understand the significance of the following rootstocks and cultivars in relation to host plant resistance: (REVIEW)
• a. Thompson seedless grape;
• b. Nemaguard and Lovell peach rootstocks;
• c. Cowpea cultivar Blackeye 46 (CB46), CB50, and CB5;
• d. Lima bean cultivar White Ventura N;
• e. Blenheim apricots;
• f. VFN tomatoes.

General Considerations (REVIEW)

• 1. Compare/contrast the use of fumigants vs. nonfumigants. (REVIEW)
• 2. Describe the factors that influence nematicide movement through the soil. (REVIEW)
• 3. List some of the problems associated with the use of soil fumigants. (REVIEW)
• 4. Define nematistat. (REVIEW)

• 5. List ideal field conditions for the application of soil fumigants. (REVIEW)
• 6. List the various methods available to evaluate soil fumigation. (REVIEW)
• 7. Describe methods for evaluating a postplant nematicide application. (REVIEW)
• 8. Describe methods for evaluating untested materials or new control methods. (REVIEW)

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