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How to Manage Pests
UC Pest Management Guidelines
Carrot
Saltmarsh Caterpillar
Scientific Name: Estigmene acrea
(Reviewed 1/09,
updated 1/09)
In this Guideline:
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Saltmarsh caterpillar larvae are hairy and gray
when first hatched, then darken to yellow, brownish, or almost black with
yellow lines. They are covered with reddish or black hairs, and can be up to 2
inches long when fully grown. Eggs are spherical,
whitish, somewhat flattened, about 0.03 inch in diameter, and found in clusters
on the undersurface of leaves.
In the southern San Joaquin Valley saltmarsh caterpillars are
occasional pests that feed on foliage. They are primarily a problem in fall
when neighboring cotton fields are defoliated.
Cultural Control
Ditch or trench around the edges of fields that border cotton.
Organically Acceptable Methods
Cultural control and sprays of the Entrust formulation of spinosad are
acceptable for use on organically grown produce.
Monitoring and Treatment Decisions
In fall, if saltmarsh caterpillars are migrating into carrots, a
treatment may be necessary.
| Common name |
Amount/Acre** |
R.E.I.+ |
P.H.I.+ |
| (trade name) |
|
(hours) |
(days) |
|
| When choosing a pesticide, consider
information relating to natural
enemies and honey bees as well as the environmental impact. |
| |
| A. |
SPINOSAD |
| |
(Entrust)# |
1–2 fl oz |
4 |
3 |
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MODE OF ACTION GROUP NUMBER1: 5 |
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COMMENTS: Do not apply more than 7 oz of
Entrust/acre/crop or more than 4 applications/calendar year. Additional
applications must be at least 5 days apart. Use allowed under a supplemental label. |
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| B. |
CARBARYL* |
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(Sevin) 80S |
1.25–2.5 lb |
12 |
7 |
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MODE OF ACTION GROUP NUMBER1: 1A |
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COMMENTS: Ground or air application. |
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UC IPM Pest Management Guidelines: Carrot
UC ANR Publication 3438
Insects
E. T. Natwick, UC Cooperative Extension, Imperial County
D. R. Haviland, UC IPM Program, Kern County
C. G. Summers, Entomology, Kearney Agricultural Center, Parlier
Acknowledgment for contributions to Diseases:
W. E. Chaney, UC Cooperative Extension, Monterey County
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