1/10/09

II.

A.

B.

Nematode Distribution Patterns

Geographic Patterns

Describe how and why distribution patterns of different nematodes
species vary. (REVIEW)

Describe how nematode population levels fluctuate in an annual crop
from harvest of one crop in fall to planting of another in spring and
harvest of that crop in the next fall. (REVIEW)

Describe how nematode populations fluctuate throughout the year on
an established perennial crop. (REVIEW)

Identify a nematode group whose distribution is mainly limited by soil
texture in California. (REVIEW)

List three reasons why root lesion nematodes are widely distributed in
California. (REVIEW)

Describe how stem and bulb and foliar nematodes are distributed to
new areas of the state. (REVIEW)

Identify the major distribution determinant of:
citrus nematodes; (REVIEW)
cyst nematodes. (REVIEW)

Describe the impact of host preference on the distribution ofroot knot
nematodes. (REVIEW)

Distribution within a Field

List two reasons why root-knot nematodes may be more severe in
sandy soils. (REVIEW)

List two ways irrigation practices can influence nematode patterns. (REVIEW)

Describe how the following factors can influence distribution of some
nematode species within the field:
initial introduction site; (REVIEW)
soil type patterns; (REVIEW)
placement of infested plant material; (REVIEW)
cropping patterns; (REVIEW)
movement of agricultural equipment. (REVIEW)

Nematode Dispersal