Thrips Control Gains
More Importance With High-Yielding Cotton
important thing to remember about cotton thrips
is getting seedling cotton plants to grow through their thrips-susceptible window, which is about the first
through fifth true leaf. Choosing the right strategy and products can
get young cotton through it.
your plants to move through that window as fast as possible. Anything
you can do to make your plants grow faster will minimize the thrips problem. They cause fewer problems on
rapidly growing plants," said Ron Smith, Auburn University Extension
treatments are valuable, he says. "You can't live without them,
but they don't always hold thrips injury
below the threshold level. We've got Gaucho, which is imidacloprid, and Cruiser, which is thimethoxan.
weather conditions sometimes will favor one of those over the other.
For example, Cruiser is a little bit more water-soluble than Gaucho. So
Cruiser will perform better in a dry spring while Gaucho will perform
better in a wet spring like last year."
including Orthene and the generics, at 1
pound in-furrow is not nearly as effective as a seed treatment and
sometimes not much more effective than an untreated seed alone, says
"We have imidacloprid in a liquid, which is Admire Pro and
is applied in-furrow. It can be as effective as a seed treatment, but
the application method appears to be a critical limiting factor. It
definitely wasn't as good as a seed treatment. Most of us were putting
it out with a flat-fan nozzle sprayed right in the furrow, and it didn't
help at all. It looked good with folks who did it with a .55 orifice
nozzle pointed directly down with low pressure right above the furrow.
It was equal to the seed treatments."
are needed on top of seed treatments when cotton is not growing
rapidly, says Smith. "We're now recommending that cotton planted
up to about May 10 should get an automatic spray on top of the seed
treatment at the first true-leaf stage."