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How to Manage Pests
UC Pest Management Guidelines
Sugarbeet
Flea Beetles
Scientific names:
Potato flea beetle: Epitrix cucumeris
Threespotted flea beetle: Disonycha triangularis
Palestriped flea beetle: Systena blanda
Tuber flea beetle: Epitrix tuberis
(Reviewed 11/05,
updated 1/10)
In this Guideline:
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The potato
flea beetle is a small (0.065 inch), shiny
black beetle. The threespotted flea beetle is two to three times larger and has
an orange-colored thorax on which are three prominent dark spots. The palestriped
flea beetle is about twice as large as the
potato flea beetle. It is dark brown and has a longitudinal creamy white stripe
on each wing cover. The tuber
flea beetle is about the same size as the
potato flea beetle and is also black and somewhat shiny, but has even rows of
small indentations on the wing covers. All of the flea beetles have enlarged
hind legs and jump vigorously when disturbed, thus the name flea beetle.
Flea beetle damage is generally a concern only during the cotyledon
and early leaf development stages. Damage is caused by adults and consists of
numerous small rounded or irregular
holes eaten in leaves so that leaves
appear to have been peppered with small shot. In young
plants this feeding damage can be
very serious and result in plant death, thus reducing stands. In addition to
adult damage, larvae of the palestriped flea beetle feeds on roots of young
plants as well as on germinating seeds.
Keep fields weed-free, particularly of field
bindweed and mustard, which
are preferred hosts of flea beetles. Replant heavily damaged fields. No
economic thresholds are available but consider treatments, especially on young
plants, if damage reaches a moderate level. Once plants are well established,
flea beetles rarely cause sufficient foliar damage to justify treatment.
| Common name
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R.E.I.+ |
P.H.I.+ |
| (trade name)
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Amount/Acre |
(hours)
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(days)
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| When choosing a pesticide, consider information relating to natural
enemies and honey bees as
well as the environmental impact. Not all registered pesticides are listed.
Always read label of product being used.
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| A. |
METHOMYL* |
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(Lannate)LV |
0.75–3 pt |
48 |
see comments |
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(Lannate) SP |
0.25–1 lb |
48 |
see comments |
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MODE OF ACTION GROUP NUMBER1: 1A |
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COMMENTS: Preharvest interval is 21 days for roots, 30 days for tops. |
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| B. |
CARBARYL* |
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(Sevin) XLR Plus |
1–1.5 qt |
12 |
28–roots and forage |
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MODE OF ACTION GROUP NUMBER1: 1A |
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Restricted entry interval (R.E.I.) is the number of hours
(unless otherwise noted) from treatment until the treated area can be safely
entered without protective clothing. Preharvest interval (P.H.I.) is the
number of days from treatment to harvest. In some cases the REI exceeds the
PHI. The longer of two intervals is the minimum time that must elapse before harvest. |
| * |
Permit required from county agricultural commissioner for purchase or use. |
| 1 |
Rotate chemicals with a different
mode-of-action Group number, and do not use products with the same
mode-of-action Group number more than twice per season to help prevent the
development of resistance. For example, the organophosphates have a Group
number of 1B; chemicals with a 1B Group number should be alternated with
chemicals that have a Group number other than 1B. Mode of action Group
numbers are assigned by IRAC (Insecticide Resistance Action Committee). For additional information, see their Web site at http://www.irac-online.org/. |
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UC IPM Pest Management Guidelines: Sugarbeet
UC ANR Publication 3469
Insects and Mites
E.T. Natwick, UC Cooperative
Extension Imperial Co.
Acknowledgement for contributions to Insects and Mites:
C. G. Summers, Entomology, Kearney Agricultural Center, Parlier
D. R. Haviland, UC IPM Program, Kern Co.
L. D. Godfrey, Entomology, UC Davis
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