|
|
How to Manage Pests
UC Pest Management Guidelines
Grape
False Chinch Bug
Scientific name: Nysius raphanus
(Reviewed 6/06,
updated 6/06)
In this Guideline:
|
|
|
False chinch bug breeds in great
numbers in grass or weedy areas, especially on London rocket,
and may migrate into vineyards when these areas dry up or are plowed under and
the pests search for green growth. Adults are gray and about 0.12 inch long. Nymphs are
gray with reddish brown abdomens. When they migrate, they are mainly in the
wingless stage, and consequently they migrate by walking. A number of winged
adults are also present, but instead of flying they march along with wingless
immatures.
Large numbers of nymphs and
adults may suck plant juices and inject a toxin that causes vines to wilt and
turn brown. Because of the great number of bugs involved and their toxic
injections, all the leaves on border vines can be killed in a few hours.
September and October migrations are also possible.
False chinch bugs are mainly a
problem in spring if large numbers move into vineyards as vegetation in
surrounding areas dries. They are only a sporadic problem but occasionally
cause rapid and serious damage to young vines.
Cultural Control
If false chinch bugs have been a
problem in past years, disc under stands of London rocket and other host weeds
about 3 weeks before budbreak in grapevines. Do not delay discing until after
budbreak, for it may result in a heavy movement of bugs from the weeds to the
vines.
Organically Acceptable Methods
Cultural controls are organically
acceptable.
Monitoring and Treatment Decisions
If discing weeds was not done,
and high populations of false chinch bugs are found on weeds at budswell or
after budbreak, a treatment may be necessary. If nymphs are found moving onto
vines, spot treat both vines and adjacent weeds. Bugs migrate mainly in one
direction and the wilted vines along the edge of the vineyard will show the
line along which they are moving. A chemical barrier about 30 inches wide can
prevent further migration.
| Common name |
Amount/Acre** |
P.H.I.+ |
| (trade name) |
|
(days) |
|
| The
following materials are listed in order of usefulness in an IPM program,
taking into account efficacy and impact on natural enemies and honey bees.
When choosing a pesticide, also consider information relating to environmental impact.
|
| |
| A. |
DIAZINON* 50WP |
1 lb |
28 |
| |
MODE
OF ACTION: An organophosphate (Group 1B)1 insecticide.
|
| |
COMMENTS:
Restricted entry interval: 5 days. Avoid drift and tailwater runoff into surface waters. |
| |
| B. |
MALATHION 8 Spray |
1.5–2.5 pt |
3 |
| |
MODE
OF ACTION: An organophosphate (Group 1B)1 insecticide.
|
| |
COMMENTS: Restricted entry interval: 24 hours. |
| |
| C. |
FENPROPATHRIN* |
|
|
| |
(Danitol) 2.4EC |
10.66–21.33 fl oz |
21 |
| |
MODE
OF ACTION: A pyrethroid (Group 3)1 insecticide.
|
| |
COMMENTS:
Restricted entry interval: 24 hours. See label for additional requirements regarding hand labor. |
| |
| |
|
![[Precautions]](/IMAGES/btn-precautions_bul.gif)
![[UC Peer Reviewed]](/IMAGES/logo-ucpeerreviewed.jpg)
UC IPM Pest Management Guidelines: Grape
UC ANR Publication 3448
Insects and Mites
W. J. Bentley, UC IPM Program, Kearney Agricultural Research Center, Parlier
L. G. Varela, UC IPM Program, Sonoma County
F. G. Zalom, Entomology, UC Davis
R. J. Smith, UC Cooperative Extension, Sonoma County
A. H. Purcell, Environmental Science, Policy and Management, UC Berkeley
P. A. Phillips, UC IPM Program, Ventura County
D. R. Haviland, UC IPM Program, Kern County
K. M. Daane, Kearney Agricultural Research Center, Parlier
M. C. Battany, UC Cooperative Extension, San Luis Obispo County
Acknowledgment for contributions to the insects and mites section:
J. Granett, Entomology, UC Davis
Top of page
|
