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How to Manage Pests
UC Pest Management Guidelines
Strawberry
Garden Symphylan
Scientific Name: Scutigerella immaculata
(Reviewed 6/08,
updated 6/08)
In this Guideline:
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Garden symphylans are
slender and white, they have 10 to 12 pairs of legs and a pair of antennae.
They run rapidly when exposed to light. They occur mainly in moist soils with
good structure and a high organic matter content and are often associated with
debris from a previous crop that is not completely decomposed. They retreat to
deeper soil levels during fallow periods and return to the root zone after
crops are planted. They damage the same area every season so infestations
spread slowly.
Garden symphylans damage plants by
feeding on roots, thus retarding plant growth. They are usually only a problem in fields that
were not fumigated, or if the fumigation was ineffective.
Soil fumigation for pathogen and weed seed control will kill
symphylans. In nonfumigated fields and fields with large amounts of crop
residue from a previous crop, continuous flooding for 3 weeks in the summer
helps reduce infestations and discing in a crop of sorghum has been reported to
reduce infestations in other crops. In organic fields, however, the best
strategy is to avoid fields that have populations of symphylans in the soil.
Research from other areas of the country indicates that symphylans
can be detected with bait trapping. Either carrots or potatoes can be used as
the bait. Cut the bait in half longitudinally and scratch the cut surface just
before placing it in a shallow hole on the soil to ensure that the surface is
moist. (Be sure that when the hole is created, the soil pores/spaces aren't
sealed close. Symphylans use these spaces to travel to the bait.) Cover the
bait with a pot. Use at least a dozen bait traps in the field. After 2 to 5
days, examine the cut surface and the soil upon which it was resting for
evidence of symphylans. If they are detected, consider a treatment. Because the
recommended treatment is best applied before transplanting, bait traps for
symphylans a few weeks before transplanting.
| Common name |
Amount/Acre |
R.E.I.+ |
P.H.I.+ |
| (trade name) |
|
(hours) |
(days) |
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| When choosing a pesticide, consider information relating
to impact
on natural enemies and honey bees
as well as the environmental impact.
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| A. |
DIAZINON AG 500* |
1 qt |
24 |
5 |
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50 WSB* |
2 lb |
24 |
5 |
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MODE OF ACTION GROUP NUMBER1: 1B |
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COMMENTS: Broadcast before transplanting and incorporate into
top 4 inches of soil. Treatment after transplanting is less effective, and
material must be well watered into the soil. Do not allow this product to run off into surface waters. |
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| B. |
CHLORPYRIFOS |
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(Lorsban) 75WG |
2.67 lb |
24 |
21 |
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MODE OF ACTION GROUP NUMBER1: 1B |
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COMMENTS: Preplant incorporate. Phytotoxicity can occur when
applied under high temperatures combined with drought stress. Do not make
more than 2 applications of chlorpyrifos-containing products per year. Do not allow this product to run off into surface waters. |
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UC IPM Pest Management Guidelines: Strawberry
UC ANR Publication 3468
Insects and Mites
F. G. Zalom, Entomology, UC Davis
M. P. Bolda, UC Cooperative Extension Santa Cruz Co.
P. A. Phillips, UC IPM Program/UC Cooperative Extension Ventura Co.
Acknowledgment for contributions to the Insects and Mites:
N. C. Toscano, Entomology, UC Riverside
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