>>My name is Tim Brenneman. I’m a research plant pathologist
at UGA working on pecan diseases and today we’re going to talk
about pecan scab which is our number one production problem
on pecans in Georgia. I see some of the results
of scab just by looking at this branch on this
non-treated tree. As you look back
through the tree you see the lack of foliage. So the scab removes the leaves. It affects the nut themselves. You can see this nut right here
has completely turned black. By comparison, I’ve got…that
here is off a sprayed tree where we’ve done a pretty good
job of controlling scab. So these nuts are maturing now,
starting to open. This is what you’d like to see
a good well-filled large size desirable and you compare that
to the unsprayed and a lot of the unsprayed nuts
are even gone; they’ve completely fallen
off the tree already. So it causes early
loss of the crop. The ones that are remaining
are going to be smaller, poor quality and right now
we’re in a market that really values large,
high-quality pecans. So any reduction in
size and quality can mean a big reduction in the
value of those pecans. Most commercial farmers
are going to spray at least 6 or 7 times a year. On susceptible varieties
like this desirable in a wet year they may
spray 15 to 20 times. So the cost easily gets up
in the hundreds of dollars per acre just spent on fungicide
to control this disease. The foliage is very
important to maintain. You have the effects on the nuts
themselves but the effects on the leaves are just as important
because that tree needs to build its reserves on into the
fall as late as possible. So if you get early defoliation,
the effects on the leaves like you see here that’s going
to affect next year’s crop as well as this year’s crop. [ Background music ] © 2015 University of Georgia College of Agricultural and
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