Here is recent pecan info below from our UGA Pecan Specialists.
Tucker Price 507-8862.
Budmoth
“Here is an insect update from Dr. Will Hudson:
“A number of growers have called asking if they need to reapply their insecticide treatments for budmoth. The answer is yes, definitely. There are several (5-6) generations for budmoth, so young trees can be attacked anytime. The more new growth they put on, the less likely the damage will be severe, but as long as they are flushing and growing actively there is some risk.
I’ve also had scattered reports of sawfly damage. These are not usually much of a problem for us, but they can occasionally cause enough defoliation, especially in young or small trees, to be a problem. The insecticides used for caterpillar control will control sawflies as well, except that Intrepid is not effective on sawflies.
With the Desirable drop well underway, it can be hard to sort through all the nuts on the ground looking for the small white spot that indicates shuckworm activity, but the next generation should be emerging and laying eggs in the next couple of weeks. If you have a heavy crop and light pressure from shuckworms, they may be doing you a favor by thinning the crop but most growers prefer to do that themselves. Keep an eye out for the signs that shuckworms are active and make the decision to treat or not based on what you see.””
How Long Does Your Fungicide Need to Be On Before the Rain? – Lenny Wells
“Pecan scab is enjoying ideal weather in much of Georgia at this time. This has kept most growers busy trying to keep the trees sprayed between rain showers. A common question we get during such conditions is “how long does my fungicide need to be on before the rain arrives?”. This is a question pathologists have been trying to answer for quite some time but there are so many variables involved it can be quite difficult to generate data to provide a hard and fast answer. UGA Plant Pathologist Dr. Tim Brenneman recently offered the following suggestions based on his studies with pecan and also on similar studies he has conducted in peanut:
Highly systemic materials like phosphite must be absorbed into the plant. It may require as much as 1/2 a day for this process to take place so that the material can be highly effective. While DMIs and strobilurins or combination products like Absolute, Top Gard, Quadris Top, and Quilt have some systemic activity they are not as systemic as the phosphites. Still, they would need a little time to be effective, so several hours to half a day would be ideal. A surfactant (80/20 or other) would increase the uptake speed of these materials and would likely provide some benefit in the conditions we’ve had over the last week or so. However, do not include a surfactant with Phosphite.
While the DMIs and Strobis have some systemic activity they still function largely as protectants. Other materials like Dodine (ELast) or Tin are pure protectants. These materials (Dodine and Tin) would be the most prone to wash off when rain arrives shortly after spraying. Dodine does adhere tightly to the plant cuticle, which likely helps it. Rainfall that occurs less than one hour after spraying makes the fungicide pretty well ineffective. Any rainfall within 24 hrs after spraying with a pure protectant will likely reduce the effectiveness of control to some extent. For each additional hour between the spraying and rainfall you gain additional control.
Ideally, all fungicides should be applied prior to rain events. If circumstances prevent you from getting a spray on in time and you have to spray after a rain event, the DMI/Strobi combinations would be the best choice.”