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How to Manage Pests
UC Pest Management Guidelines
Almond
Tenlined
June Beetle
Scientific name: Polyphylla
decemlineata
(Reviewed 1/05,
updated 1/05)
In this Guideline:
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Adult beetles are about 1 inch long
and brown in color with longitudinal white lines on the back.
Larvae are cream-colored grubs with a
brown head capsule. They live in the soil and are about 2 inches long when
mature. There is one generation every 2 years, and adults emerge from the soil
from late June through September.
Larvae feed on roots, causing severe
injury and death to mature trees.
Adults cause no damage.
Tenlined June beetle infestations are localized within orchards and are often
first noticed when a clump of trees start to decline and die. Infestations
usually spread slowly from the initial sites where they are first identified in
orchards, killing neighboring trees. Control requires the removal of infested
trees and soil fumigation before replanting. When removing dead trees, inspect
roots for the presence of larvae or larval feeding. Remove all trees in the
infested area plus one or two uninfested trees on all sides of the infested
area to stop the spread within the orchard. Fumigate the soil following label
directions and replant.
Male tenlined June beetles are attracted to black light traps and generally
first appear in early June. Although there are no proven methods for
controlling tenlined June beetles other than removing infested trees and
neighboring trees (including roots of trees) and fumigating the soil before
replanting, it has been observed that soil drenches of an organophosphate
insecticide as soon as first adults emerge can reduce populations. Because the
insect has a 2-year life cycle in the soil, this approach must be repeated in
consecutive years.
| Common name |
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P.H.I.+ |
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| (trade name) |
Amount/Acre** |
(days) |
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| A. |
METHYL BROMIDE*/ CHLOROPICRIN* |
300-400 lb |
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COMMENTS:
Apply to previously infested area after complete removal of tree and roots. Any use of
methyl bromide after Dec. 31, 2004 must be allowed under a critical use exemption.
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| B. |
CHLORPYRIFOS* |
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(Lorsban) 4E |
2 qt |
14 |
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COMMENTS: Soak orchard floor thoroughly with
sprinklers before application. Apply to orchard floor in a minimum of 50 gal
water; 50-100 gal have given longer control in trials. In orchards where infestations
are concentrated on the berms or around low-volume emitters, use 8 pt/treated
acre in a 6- to 10-ft band along the berm or drip line. Orchards where beetles
are more widely distributed will require treatment over the entire orchard
floor. Do not allow livestock to graze in treated orchards. Avoid drift or
tailwater runoff into surface waters. |
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UC IPM Pest Management Guidelines: Almond
UC ANR Publication 3431
Insects and Mites
F. G. Zalom, Entomology, UC Davis
C. Pickel, UC IPM Program, UC Cooperative Extension, Sutter/Yuba counties
W. J. Bentley, UC IPM Program, Kearney Agricultural Center, Parlier
R. L. Coviello, UC Cooperative Extension, Fresno Co
R. A. Van Steenwyk, Insect Biology, UC Berkeley
M. W. Freeman, UC Cooperative Extension, Fresno Co.
Acknowledgment for contributions to the insects and mites section:
R. E. Rice, Kearney Agricultural Center, Parlier
L. C. Hendricks, UC Cooperative Extension, Merced Co.
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