|
Principle
|
IPM
Practice
|
| Monitor
soil populations over time |
Estimate
cyst populations in fields before planting susceptible
hosts; for methodology, see WSU EB1872
Do
not plant green peas or other susceptible hosts in fields
where PCN populations exceed 0.5, 0.8 and 2 eggs per gram
of soil for peas, fava bean and vetch, respectively
Damage
thresholds established in Italy (Greco et al., 1991) hold
true for western Washington; yield losses of 20% and 50%,
can result from 3 and 8 eggs per gram of soil for pea,
5 and 15 eggs per gram of soil for broad bean, and 20
and 78 eggs per gram of soil for vetch, respectively
|
| Maintain
low soil populations over time |
Employ
long rotations (5 years out of pea or other susceptible
hosts) where egg densities are low |
|
The
reproductive potential of PCN on fava bean is potentially
higher than on pea, possibly because fava bean has greater
root mass and is more likely to provide a healthy substrate
for the nematodes because it is less subject to damage
by root rot fungi
In
preliminary studies juveniles penetrated roots of hairy
vetch cover crop plants during the fall and winter, but
failed to develop into cysts
|
Avoid
planting susceptible hosts like green pea, dry pea, fava
bean and certain vetches in PCN infested fields
Although many vetches are susceptible to PCN, hairy vetch
planted in the winter in western Washington is a possible
trap crop for H. goettingiana; more research is
needed, however
|
| Cool
temperatures favor hatching and root invasion by PCN; pea
yield loss is greatest when pea roots are infected early
during the growing season |
Delay
planting until late spring when soil temperatures have warmed
(>58 F); avoid conditions like deep planting and soil compaction
which delay rapid emergence of pea seedlings |
| Nematode
cysts survive in soil for long periods of time and are spread
primarily by infested soil and plant materials, or water
or wind |
Power
wash equipment, conveyances and footwear before leaving
contaminated fields to help limit introduction of cysts
into non-infested fields |
