Lowndes – Echols Ag News

Tank-Mixing Chemicals

Dr. Eric Prostko with University of Georgia shared some information on tank-mixing pesticides:

Tank-mixing pesticides can be rather complicated especially when numerous products will be mixed.  Here are a few questions and answers based upon some recent inquiries that I have received:

1) Can I tank-mix Prowl EC and Prowl H20?

I have never have done this in my research plots but I recently conducted a small tank-mix test (Figure 1).  With good agitation, I did not observe any problems.  Do not mix these two herbicides together before putting in water.  They should be put in spray tank (already filled with water) separately.

Figure 1.  Prowl H20 3.8ASC + Prowl 3.33EC Tank-Mix (32 oz/A of each in 15 GPA, Prowl H20 was put in 1st)


2) Can I tank-mix dry and liquid Valor formulations together in a spray tank?

I have never done this either in my research plots but I conducted another small tank-mix test (Figure 2).  With good agitation, I did not observe any problems.  Remember, it is always a good idea to pre-slurry dry formulations in water before dumping into a large spray tank.

Figure 2.  Valor SX 51WG + Valor EZ 4L Tank-Mix (3 oz/A of each in 15 GPA)

3)  When tank-mixing various pesticides, what is the correct mixing order?  

The general formulation science mixing order is as follows:

a) water soluble bags (WSB)
b) water soluble granules (WSG)
c) water dispersible granules (WG, XP, DF)
d) wettable powders (WP)
e) water based suspension concentrates/aqueous flowables (SC, F)
f) water soluble concentrates (SL)
g) suspoemulsions (SE)
h) oil-based suspension concentrates (OD)
i) emulsifiable concentrates (EC)
j) surfactants, oils, adjuvants
k) soluble fertilizers
l) drift retardants

For those Millennials out there that sleep with their cell phones taped to their head or hands, there is an app called Mix-Tank (Precision Laboratories) that you might find useful (http://www.mixtankapp.com/). There might be some other apps out there that I am not yet aware of?

4) How do I mix Reflex and Gramoxone?

a) add 1/2 of the required amount of clean water into the spray tank
b) start up and maintain tank agitation
c) add NIS
d) add Reflex
e) add Gramoxone
f) add remaining amount of clean water

5) How do I mix Atrazine and Halex GT?

a) add 1/2 of the required amount of clean water into the spray tank and start/maintain agitation
b) add AMS (**only if water quality sample indicates need)
c) add NIS
d) add atrazine (make sure atrazine is fully dispersed before adding other products)
e) add Halex GT
f) add remaining amount of clean water

Seedcorn Maggots in Transplanted Crops

Problems with seedcorn maggots in transplanted crops are popping up all over south Georgia this Spring. While this is a rare occasion (use of transplants avoids many soil borne insect problems), that makes it no less severe when it occurs. Maggots can kill tender young transplants, but cause minimal injury once the plants become established and harden off.

The adult files look like small house flies and are attracted to decaying organic matter. For this reason, they tend to be worse in fields where manure, weeds or a cover crop were plowed in just before planting. For future reference, it is generally recommended that this plowing occur at least three weeks before planting/transplanting. They still can occur in “clean” fields as the transplant media, which is high in organic matter, can attract flies once it is planted into the field.

Seedcorn maggots are worse under cool, moist conditions. This both slows the growth of the plant so that it is susceptible to damage for a longer period and is favorable to the maggots. One research report from Purdue indicated that damage to transplants dropped dramatically (from 60 to 80 percent down to 10 to 0 percent) as soil temperature increased above 70 degrees.

There are no effective rescue treatments for seedcorn maggot infestations. A pre-plant treatment with diazinon should avoid this problem, but is rarely done as the problem is rare. A foliar application with a broad spectrum insecticide after setting/resetting the plants should help suppress fly activity in the field and buy some time for plants to become established.

Lorsban in Sweet Potatoes

Lorsban 24C Label for 60 Day PHI in Sweet Potato

 

While it has taken several years, Georgia does now have a 24C registration to allow for the use of Lorsban in Sweet Potato with a 60 day pre-harvest interval (PHI).

Lorsban is still labeled for pre-plant incorporated application only.

Do Pepper Weevil Overwinter in South Georgia

Do Pepper Weevil Overwinter in South Georgia?  Dr.  Sparks answers the question.

The answer to this has always assumed to be no, but that has apparently changed. Will they survive long enough to infest the spring plantings at an economical level remains to be seen, but I would not bet against them at this point.

In the past two months we have surveyed some fields old pepper fields and continue to find live pepper weevil adults. We started by collecting old pods (but still solid) in a couple of fields that had jalapeno pepper in the fall. These had been mowed, but pods which had not disintegrated were scattered throughout the field. We dissected pods and never found any grubs, but we did collect adults on the outside of these pods. I believe that these old pods are providing a food source for adults, thus allowing them to live for several months (instead of a few weeks without food).

We then placed pheromone traps in a couple of fields. These are baited with both the weevil pheromone and a plant extract. These baits have not performed well historically (when tested in standing pepper fields), but we have caught adult weevils consistently with these traps in the last few weeks.

Bottom line is that we did appear to overwinter adult pepper weevil in South Georgia. With this fact, I would suggest treating early pepper fields for weevils at the first sign of any buds in the field. Weevils will feed on foliage, but this damage is insignificant. They require a fruiting structure to reproduce. Thus, let the plants attract the weevils into the field until the plants are getting ready to set fruit and then eliminate the weevils prior to reproduction. Hopefully this will start us off clean and prevent the problems we saw last fall.

A final reminder – last year the pyrethroid insecticides were not controlling pepper weevil in Georgia. Products which have shown good efficacy include oxamyl (Vydate and others), Assail and to a lesser extent, Exirel.

 

Organic Vegetable Fertility and Weed Management Class

Dr. Tim Coolong will be coming down to teach a class for those who currently or interested in Small Organic Farming or Urban Gardening on February 23rd from 10:30-11:45. He will be talking about vegetable fertility and weed management. The information is below. If you have any questions, please contact Josh Dawson, Fort Valley Extension Agent.

DIAMONDBACK MOTH CONTROL UPDATE

If you are a brassica grower, retailer or have brassica in a greenhouse, I highly encourage you to go to a diamondback moth update that is being held in Moultrie on February 23rd. Below is the schedule. Please RSVP to either of the numbers given so they can have a head count.

Colquitt County Extension Office

350 Veterans Parkway North

Moultrie, GA 31788

9:30 AM 10:00 AM Registration and Refreshments

10:00 AM 10:10 AM Welcome and Opening Comments

Jenna Brock, UGA Extension ANR Agent

Donna McMikle, DuPont

10:10 AM – 11:00 AM Diamondback Moth Control Update

Dr David Riley, UGA Vegetable Research Entomologist

Dr Stormy Sparks, UGA Vegetable Extension Entomologist

11:00 AM 11:10 AM BREAK / DRAWING

Jenna Brock, UGA Extension ANR Agent

Donna McMikle, DuPont

11:10 AM Noon DuPont Best Management Practices for Controlling DBM

Jeff Meredith, DuPont Product Dev Mgr

Stanley Royal, DuPont Dev Rep

NOON Closing Remarks

Jeff Meredith

DRAWINGS

Jenna and Donna

LUNCH

PESTICIDE CREDITS WILL BE AVAILABLE

PLEASE RSVP SO WE CAN PLAN ACCORDINGLY FOR LUNCH

JENNA BROCK (229) 921-1992 jkickli2@uga.edu

DONNA MCMIKLE (229) 881- 1171 donna.h.mcmikle@dupont.com

 

2017 Production Meetings

Five row crop and vegetable production meetings are currently scheduled in Lowndes County. Commercial (cat. 21), and private pesticide credit will be given with each meeting to all license holders who attend and sign in.  Please call the office (333-5185) a few days ahead if you plan to attend so that plans can be made for the meal. I look forward to working with you this year and please contact me if you need anything.

Don’t let your license expire put these meetings on your calendar now.

  • January 10, 2017 Peanut Production andPeanut Insects
    12:00 noon Lowndes Extension Office
    Dr. Scott Monfort
    Dr. Mark Abney
  • January 13, 2017 Vegetable Production
    9:30 a.m. 4-H Center-Lake Park
    Dr. Stormy Sparks
    Dr. Tim Coolong
    Dr. Bhabesh Dutta
  • February 6, 2017 Row Crop Disease and Fertility
    12:00 noon Lowndes Extension Office
    Dr. Glen Harris
    Dr. Bob Kemerait
  • March 2, 2017 Cotton Production Cotton Insect
    6:00 pm Lowndes Extension Office
    Dr. Jarod Whitaker
    Dr. Phillip Roberts
  • March 8, 2017 Row Crop Weed Control
    12:00 noon Lowndes Extension Office
    Dr. Eric Prostko

Downy Mildew in Cabbage

Downy mildew has been found in a cabbage field in southwest Georgia.

Below is some information from Bhabesh Dutta, UGA extension plant pathologist.

Downy mildew of cabbage has been detected from Colquitt County in Georgia (Dec 9, 2016). These observations indicate that inoculum of downy mildew is currently in GA and under favorable conditions (cool and wet conditions) potential disease outbreak in cabbage and other cruciferous/cole crops can occur. I would suggest our growers to look for the downy mildew symptoms in their fields and start applying protective spray of below stated fungicides.

Fungicide application (a weekly schedule):

Tank mix Chlorothanonil with Reason or Presidio or Revus or Forum. 

For more information please contact your local county extension agent.

Below is a picture of what to look for in the field.

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