If your grubs eat the cow manure, then you may be able to control them by
feeding an insect growth inhibitor to the cows. We have Japanese Beetles
here and that is what we are doing to control their grubs. It also
controls hornflies. It is pretty expensive but so will any chemical control
of grubs.
Clay
MO Ozarks
----- Original Message -----
From: "liliana Sotomayor" <whitsot@uio.satnet.net>
To: <graze-l@witt.ac.nz>
Sent: Saturday, May 01, 2004 6:13 PM
Subject: RE: [Graze-l] grass grubs
> Thanks Dieter!
>
> When I seed pastures that are near infested older pastures I am using a
> pelleted version of the chlopyrifos with good control for 1 year. However
> there has to be a way to control unseeded pastures in a more organic
manner.
> I haven't found Imidacloprid here in a form that is not dog and cat flea
> control. It must be expensive. I have a no till seeder but it doesn't have
> cutting discs and since the roots of the ryegrass are so shallow these
days,
> if I go in with the seed drill I will pull out all surviving plants.
> The high stocking rate is used by putting all cows to graze in a small
area
> with portable fences and moving them as soon as the grass is gone.
> Compaction is not too serious here but I can use an aerator if needed.
>
> Thanks for the message,
>
> Lili
>
> -----Original Message-----
> From: graze-l-admin@witt.ac.nz [mailto:graze-l-admin@witt.ac.nz]On
> Behalf Of Dieter Uslar
> Sent: Friday, April 30, 2004 8:07 AM
> To: graze-l@witt.ac.nz
> Subject: Re: [Graze-l] grass grubs
>
>
> Hy Liliana!
>
> Here in the south of Chile it is comon for us to have grass grub in our
rye
> grass pastures.
> This type of insect only eat roots, so it is hard to get there with some
> insecticides; we have good results using: clorpirifos 10 % dust, 5 Kg/ha,
> mixed with the fertilizers and put in the soil with a no till seeder.
> Another good control is Imidacloprid 70 %, using 200 grams per 25 Kg of
rye
> grass seed, and seed with a no till seeder. Depending of the stage of
grouth
> of the insect, it is posible to control some population, using a high
> concentration of animals to squeeze the insects in the soil; it helps only
> to reduce the population, no to control 100 %, and you can get some
> compactation problems, depending from your soil.
> Hope this helps.
>
> Regards
>
> Dieter Uslar
> Agronomist
> COLUN Ltda.
> www.colun.cl
> duslar@colun.cl
>
> ----- Original Message -----
> From: "liliana Sotomayor" <whitsot@uio.satnet.net>
> To: "Graze-L@Witt. Ac. Nz" <graze-l@witt.ac.nz>
> Sent: Wednesday, April 28, 2004 7:22 AM
> Subject: [Graze-l] grass grubs
>
>
> > Dear List members,
> >
> > I would be grateful for any comments on the management of ryegrass
> pastures
> > that are infested with grass grubs. Here is my situation.
> > We have been using NZ ryegrass seed for more than 20 years now and
> > constantly improving soil fertility. Soil tests for P are around 30-35,
> > great organic matter content, but we still have a bit of S and Mg to
add.
> We
> > are located at 3000 m above sea level. In the past 5 years we have seen
> the
> > ryegrasses being pulled by the cows as they graze to the point that
> pasture
> > persistence is diminished to 3 years. Since kikuyu is present it readily
> > takes over. Examination of the root structure reveals poor root
> penetration
> > to deeper parts of the soil, although examination of the soil profile
> > indicates no level of compaction ( and water drains freely). Grass grubs
> are
> > present at rates of 2 to 10 per area of 20 square cm. which I have been
> told
> > is a level of action in NZ.
> >
> > If treatment is needed for the pasture the question is with what. I have
> > thought of using systemic insecticides that are sprayed on the grass and
> its
> > transported to the roots where it will kill the grub. I do have access
to
> a
> > sprayer. Application of insecticide granules on to the soil is a bit
> harder
> > as I will need a seed drill with discs.
> >
> > I think the grubs are a problem but that maybe grazing management would
> help
> > control them. At this point I HAVE to do something drastic to save some
> of
> > the better paddocks. What would be the insecticide to use (generic name
> for
> > ingredient, please), rate, when to apply, when to graze again.
> >
> > Thanks so much for any comment.
> >
> > Liliana Sotomayor, DVM
> > Casilla 17-12-245
> > Quito, Ecuador
> >
> >
> > _______________________________________________
> > Graze-l mailing list
> > Graze-l@witt.ac.nz
> > http://graze-l.witt.ac.nz/mailman/listinfo/graze-l
>
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