How to Manage Pests
UC Pest Management Guidelines
Carrot
Bean Aphid
Scientific Name: Aphis fabae
(Reviewed 10/05,
updated 10/05)
In this Guideline:
|
|
|
Bean aphid is a dark,
olive-green to black colored aphid. It is most easily confused with the cowpea aphid. Bean aphid has a
dull, mattelike appearance while the cowpea aphid is shiny. The cauda
(tail-like structure) of the bean aphid has more hairs than that of the cowpea
aphid and thus appears bushy. Except for the presence of wings, the winged form
of the bean aphid is similar in appearance to the wingless forms.
Bean aphid may transmit celery mosaic but little is known in this
regard. Bean aphid only occasionally builds up on carrots and little is known
regarding economic thresholds and damage.
Biological Control
Bean aphids are attacked by a variety of common aphid predators and
parasites. Lady beetles, green
lacewing larvae, and syrphid fly larvae are
frequently found associated with aphid colonies. Bean aphid is also attacked by
a very prolific parasitic wasp, Lysiphlebus testaceipes. Parasitized aphids become bloated and their bodies
turn tan in color. Bean aphid is also attacked by a fungus disease that leaves
the aphid body flattened and with the appearance of being glued to the leaf.
Cultural Control
No cultural control strategies are presently available for managing bean
aphids in carrots.
Organically Acceptable Methods
Biological and cultural controls are acceptable for use on organically
grown produce.
Monitoring and Treatment Decisions
Monitor fields for aphids weekly during spring and summer by examining
the upper and lower surfaces of leaves. Also, look for evidence of predators
and parasites and their impact on aphid populations. Treatment is rarely
required. No thresholds have been established for the treatment of bean aphid
on carrots. Chemical treatments are not effective in preventing virus
transmission and this aphid rarely causes economic damage.
| Common name |
Amount/Acre**
|
P.H.I.+ |
| (trade name) |
|
(days) |
|
| When choosing a pesticide, consider information relating
to water quality and impact on natural enemies and bees.
|
| |
|
|
|
| A. |
IMIDACLOPRID |
|
|
| |
MODE OF ACTION: A neonicotinoid (Group 4A)1
insecticide.
|
| |
(Provado) 1.6F |
3.5 fl oz |
7 |
| |
COMMENTS: Thorough, uniform coverage is
important for good control. Use allowed under a supplemental label.
|
| |
|
|
|
| B. |
DIAZINON* 50 WP |
1 lb |
14 |
| |
MODE OF ACTION: An organophosphate (Group 1B)1 insecticide. |
| |
COMMENTS: Avoid drift and tailwater runoff into surface waters. |
| |
|
|
UC IPM Pest Management Guidelines: Carrot
UC ANR Publication 3438
Insects
C. G. Summers, Entomology, Kearney Agricultural Center, Parlier
W. E. Chaney, UC Cooperative Extension, Monterey Co.
E. T. Natwick, UC Cooperative Extension, Imperial Co.
D. R. Haviland, UC IPM Program, Kern Co.
Top of page
|