Cotton growers keeping an eye out for boll
rot
By Mary Hightower
Arkansas Cooperative Extension Service
August 28, 2008 –
Arkansas cotton growers are keeping an eye on their fields to see if
the plentiful rain of the last two weeks has promoted boll rot, said
Dr. Tom Barber, extension cotton agronomist with the University of
Arkansas Division of Agriculture.
Farmers
have received much-needed rain, but that much water can be a
double-edged sword for Arkansas’ cotton growers, said Barber
“We had a lot of rain in the southeast –
anywhere from 2 to 10 or 11 inches in downpours,” Barber said.
“The fields that are receiving the highest
amounts of water seem to be in a rainfall cycle, where we’re seeing
it every four to five days,” Barber said. “Because of this, in these
irrigated fields, with a dense cotton canopy and long periods of
cloudy weather, boll rot will definitely increase on the lower
position bolls.
“Depending on the extent of the rot, we could
see a yield decrease because the majority of our crop is set toward
the bottom of the plant,” he said. “Sunshine is the best cure for
this.”
The rain is giving cost-battered growers a
chance to stop spending.
“It’s saving us money right now. We’re not
having to turn the wells on,” Barber said.
There are a couple of ways the recent downpours
could cause a little trouble. Boll rot may become the biggest issue
on irrigated cotton with all the rainfall.
On fields without irrigation, re-growth could be
troublesome.
“About 15% of the crop is non-irrigated, and on
these areas is where we’ll get a lot of re-growth in the top of the
plants from the moisture,” he said.
“Now that we’ve got rain, we have some residual
nitrogen and fertility under the crop without moisture,” Barber
said. With the rain, “it’ll cause a green-up period, and it’ll cause
the plants to bush out there with not much on it.”
According to the
Arkansas Agricultural Statistics Service’s crop report for the week
ending Aug. 24, cotton opening bolls reached 7% by week’s end. The
service also said top soil moisture supplies were 5% short, 70%
adequate and 25% had a surplus.