Date:		  
To:		 AgEnto@listserv.montana.edu
Subject:	 Grasshopper control agents and methods 
From:		 Sue Blodgett
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I've had a question or two come in on seed treatment and other strategies
for control of grasshoppers in winter wheat seeding.  Adult grasshoppers
present at the time when winter wheat is emerging can have a major impact on
plant stand.  I've had experiments nipped in the bud, so to speak, when
grasshoppers kept the wheat completely eaten down so there was literally
nothing emerging.  Because there is such little vegetation available at this
time, even light to moderate infestations can reduce stand along the field
edge.  The best time to spray the borders for grasshoppers is - believe it
or not - right before the wheat emerges.  Too early  - lose residual
activity, Too late - may have some damage. 

 

There are at-seeding applications of insecticides but there are several
problems with these methods - outlined in the High Plains Guide, not the
least of which is potential for phyottoxicity, need for specialized
application equipment, and variable efficacy under dry conditions. 

 

Gaucho is the seed treatment that has been shown to be efficacious for
grasshopper control.  [Gaucho label can be seen at the Gustafson web site
http://www.gustafson.com/products/labels/labels.asp#
<http://www.gustafson.com/products/labels/labels.asp>  

However this material is quite costly.  One way to use it effectively and
more economically would be to treat about 50-60 feet of the the field edge
with Gaucho treated seed and leave the center untreated.  Also you may want
to consider seeding borders to higher density of wheat - to allow for the
loss of some plants.  We have some information on this in the High Plains
IPM Guide, under the cropland grasshopper section.  Hopefully this link will
get you there.
http://highplainsipm.org/HpIPMSearch/Docs/GrasshopperGuide-Cropland.htm
<http://highplainsipm.org/HpIPMSearch/Docs/GrasshopperGuide-Cropland.htm> 

 

Baits are not a good option for controlling adult hoppers as they are more
attractive to the immature stages and so are typically used in the spring,
rather than the fall.

 

 

 

Sue Blodgett, Assoc Prof

Dept Entomology, L. Johnson Hall

Montana State University

Bozeman, MT 59717

Phone:  (406) 994-2402           Fax: (406) 994-6029

blodgett@montana.edu

 

 


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I've had a question or two come in
on seed treatment and other strategies for control of grasshoppers in winter
wheat seeding.  Adult grasshoppers present at the time when winter whe=
at
is emerging can have a major impact on plant stand.  I've had
experiments nipped in the bud, so to speak, when grasshoppers kept the wheat
completely eaten down so there was literally nothing emerging.  Because
there is such little vegetation available at this time, even light to moder=
ate
infestations can reduce stand along the field edge.  The best time to
spray the borders for grasshoppers is - believe it or not - right before
the wheat emerges.  Too early  - lose residual activity, Too late=
 -
may have some damage. 

 

There are at-seeding applications of
insecticides but there are several problems with these methods - outlined
in the High Plains Guide, not the least of which is potential for phyottoxicity, =
need
for specialized application equipment, and variable efficacy under dry
conditions. 

 

Gaucho is the seed treatment that has =
been
shown to be efficacious for  grasshopper control.  [Gaucho label =
can
be seen at the Gustafson web site  http://www.gus=">http://www.gustafson.com/products/labels/labels.asp">http://www.gus=
tafson.com/products/labels/labels.asp#


However this material is quite
costly.  One way to use it effectively and more economically would be =
to
treat about 50-60 feet of the the field edge with Gaucho treated seed and l=
eave
the center untreated.  Also you may want to consider seeding borders to
higher density of wheat - to allow for the loss of some plants.  We
have some information on this in the High
 Plains IPM Guide, under the cropland grassho=
pper
section.  Hopefully this link will get you there.  http://highplainsipm.org/HpIPMSearch/Docs/GrasshopperGuide-Cropland=
.htm">http://highplainsipm.org/HpIPMSearch/Docs/GrasshopperGuide-Cropland.h=
tm

 

Baits are not a good option for
controlling adult hoppers as they are more attractive to the immature stages
and so are typically used in the spring, rather than the fall.


 

 

 

Sue Blodg=
ett,
Assoc Prof

Dept
Entomology, L. Johnson Hall

Montana=
 State Univers=
ity

Bozeman=
, MT 59717

Phone:&nb=
sp;
(406) 994-2402           =
Fax:
(406) 994-6029

blodgett@=
montana.edu

 

 







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