Sugarcane Aphids in Grain Sorghum

Threshold levels have been reached are will be soon on late planted grain sorghum (milo).  Every field of grain sorghum that I have looked at in the past several weeks has had some level of infestation from these fairly new pests.

This aphid pest that once only infested sugarcane has quickly become a pest of grain sorghum throughout the Southeast.  Since it is still a relatively new pest we are still learning about pest thresholds and the best tools to control it.  

Planting early and seed treatments can help early infestations, however much of our sorghum is planted later in the season and is untreated seed.  Fields should be scouted early and often to monitor pest levels and to be able to track the increase in populations across the field.

Threshold levels developed in the Delta range from 25% infested leaves with colonies of 50+ or 30% infested plants with colonies of 100+.  Either way once we get near this threshold we need to apply a suitable insecticide to reduce populations and protect yields.

Products that we have available are Transform, Sivanto, Chlorpyrifos (Lorsban, and others), and Dimethoate (Cygon,).  Dimethoate has had variable results and is not one that we would recommend. Chlorpyrifos has done well but the high rate requires a 60 day pre-harvest interval.  Sivanto has couple of labels for sorghum and was effective at the 4 oz. rate in trials.  the pre-harvest interval is 21 days.  Transform is another product that has label specifically for this pest.  it has a 14 day pre-harvest interval and has been effective even at low rates (0.75 oz) providing good coverage is accomplished.

Coverage is the key and can be improved by using at least 15 gallons per acre, by increasing pressure, and with the addition of a non-ionic surfactant at 0.25% v/v.

Disease Forecasting for Producers

There are some good tools that are easy to access and use for producers as well as county agents and crop consultants.  Several of the diseases that we see on crops in the southeast overwinter in warmer climates and migrate with weather pattern and crop maturity from south to north.

We have sites that track the movement of diseases such as southern corn rust, soybean rust and downy mildew of cucurbits.  You can also see what is going on with legumes, pecans, and onions. You can go to:  http://www.ipmpipe.org/  to find all of these services. Once there you will see maps that shows where diseases have been confirmed and areas that are being scouted.

This is for the current southern rust situation.  There are similar maps for soybeans and cucurbits.

Georgia Clean Day

Gwinnett County is a long drive but it may be worth it you have alot of unwanted or old pesticides

Georgia Clean Day                                                                                                                           

This is an excellent opportunity to dispose of pesticides that you have been holding because you had neither an economical nor legal means to dispose of them. Canceled and suspended pesticides by definition cannot be used and must be disposed of, often as hazardous waste. Some reasons to participate in this program are: 1. No disposal fees for those who participate in the 2015 program. 2. The disposal contractor secures all permits and approvals. 3. Disposal contractor takes possession of the waste and thereby becomes the generator. 4. Participants are not directly involved with state and federal regulatory agencies. 5. All materials eligible for destructive incineration will be destroyed. 6. Minimization of ongoing liabilities from continued storage of these wastes on your property.

The Georgia Department of Agriculture is proud to announce it has secured limited funding for a one day Georgia Clean . The event will be held at the Gwinnett County Fairgrounds 2405 Sugarloaf Parkway

Lawrenceville, GA 30045 from 8:00am – 3:00pm on July 22, 2015.

Southern Rust Found in South Georgia

Andy Shirley, Mitchell County Ag Agent, confirmed southern rust in a growers field late last week. Check out Dr. Dewey Lee's blog post to learn more.

http://georgiagraincrops.com/corn/southern-rust-found-in-georgia-corn-dang-it

Peanut Pegging Zone Sampling

Peanuts produce their own nitrogen and are great at scavenging for phosphorous and potassium.  The one nutrient that is critical, especially on larger seeded peanuts like Georgia 06G, is calcium.  Since most of our peanuts were planted by the first of May now is the time to determine if you need to apply calcium.  We can easily determine calcium levels by taking a pegging zone soil sample. 

To take a pegging zone sample simply take a soil sample in the zone where the peanuts will eventually be pegging.  This sample needs to be taken to a depth of 3".  Calcium levels in this sample will help us determine if there is a need for additional calcium and if so how much.  We can supply the needed calcium by applying gypsum or landplaster.  Lack of calcium especially in Georgia 06G will result in decreased yields due to excessive pops or empty pods.

Pecan Scab Sensitivity Testing

UGA Extension Specialists continue to provide timely information to both growers and Agents across the state.  Lenny Wells, Extension Pecan Specialist is no exception.  His Pecan blog offers timely information to growers in Georgia and the southeast.  His latest post is about a free program that Dr. Katherine Stevenson is offering again for the 2015 growing season.  

To read more about the program and stay current on what is happening in Georgia's Pecan crop you can check out Lenny's Blog at UGA Pecans.  Thanks to Lenny, Dr. Stevenson, and the Georgia Agricultural Commodity Commission for Pecans for making this program available to our producers.

Farm Bill 2014 Update

With regards to the Farm Bill of 2014 some very important dates are approaching.  The first is December 12th 2014.  This is when economists from UGA, the Farm Service Agency, and USDA Risk Management Agency will be conducting a meeting to explain the changes to the new Farm Bill.
The meeting will be from 9:30 a.m. to 12:00 p.m. at the CW Pettigrew Center at Fort Valley State University.

This is a very important meeting,  Under the new farm bill producers will be able to update/reallocate crop base and to update their yields.  They will also discuss the new farm programs and what they will mean for different commodities.

The next important date is February 27th, 2015.  This is the final day to update your base and yields with FSA.  This should be done for each farm serial number that you currently farm and it is up to the owner to do this.  Owners can give producers power of attorney to complete this action.

Next is March 31st, 2015.  This is the final date to decide between either Agriculture Risk Coverage (ARC) or Price Loss Coverage (PLC).  All producers on the farm must agree on the same coverage. You can select different coverage for different commodities, but the decision is final for the life of the farm bill.

With good yields in recent years it is critical that we update yields on farms if nothing else.  This will determine the yield that you will be protected against under either of the new coverage plans.

There are two decision aids available to help producers with reallocation and coverage choices.
Texas A& M's Decision Aid or the  University of Illinois's Decision Aid.

Pumpkins

One of the surest signs that fall is upon us is the appearance of pumpkins for sale along the roadside. Generally speaking if pumpkins are ready for harvest, frost can’t be far behind. The search for the perfect pumpkin has become almost as important as finding the perfect Christmas tree.

The name pumpkin originated from “pepon” the Greek work for “Large Melon”. Native Americans used pumpkin seeds for food and medicine. American Colonists sliced off pumpkin tips removed the seeds and filled the inside with milk, spices and honey. This was baked in hot ashes and is the origin for our pumpkin pie.

Pumpkins come in many shapes and sizes. Over the last couple of years, miniature pumpkins have become very popular. Many pumpkins will be carved into Jack-O-Lanterns. Finding just the right pumpkin for carving is a personal choice. Select a pumpkin that is visually appealing, usually a deep orange. The shape is just whatever appeals to you. If it has a flat spot or blemish, just turn that side to the back and carve the front or use it as part of the design.

So how do you preserve your carved pumpkin to make it last longer. Did you carve a great pumpkin masterpiece last year only to have it rot days before Halloween? Here is something you can try to help preserve the pumpkin a little longer. The intact skin of a pumpkin protects it until you carve it. But then various organisms can get inside and start to break it down. Simple dehydration will begin the moment the pumpkin is carved. Make a bleach solution of 1 tablespoon of bleach per quart of water and put it in a spray bottle. Spray the pumpkin inside and all cut areas of the pumpkin with the solution. This will kill the bacteria and mold that cause rotting. Let it penetrate and dry for about 20 minutes. Keep your pumpkin out of direct sunlight and try to keep it as cool as possible, and you should get at least a week or two of enjoyment out of it!

The tradition of hollowed out pumpkins originated in Ireland and Scotland where they hollowed out turnips and placed embers or candles inside. Irish families who immigrated to America brought the tradition with them, but they replaced the turnips with pumpkins which were native to the New World. I am glad pumpkins were native to America, how would you like to carve a turnip?

Have you ever wondered why carved pumpkins are called Jack-O-Lanterns? If you really want to know you can give me a call.

Defoliation Options

We got extremely hot and dry the last few weeks of the growing season which pretty much shut down our dryland cotton production.  The conditions caused much of the top crop to be stunted and very poorly developed.  It also shut down terminal growth which would have been good for defoliation and boll opening.

However, we were not that lucky.  A few recent rains and slightly milder temperatures caused most of our cotton to resume growth.  Now we have fields across the region that look like the picture below.

Not only do we have to try and open bolls and defoliate the crop, but now we have to control the young tender shoots that are present.  Every field will be a little different than the next but most of the ones that I have been in would benefit from a 3-way mixture.  Something for boll opening plus defoliation and regrowth control.

We don't want to spend any more money than we have to but we also don't want to make a mess and have to put the sprayer back into the field a second time.  let's say that the 3-way mixture of thidiazuron + diuron + ethephon costs you $12.00 per acre.  What would happen if you wanted to save $2 -3 dollars by leaving out the thidiazuron?  Most likely the young tender regrowth in the field would not be removed and you would need to retreat.  Instead of saving $3 you end up spending more than $5, plus the time to spray and the delay in harvest.

Like I said in the beginning every field and every situation is different but in most cases I feel that the 3 way mixture of boll opener + defoliant + regrowth control is going to be needed this year.

Early September is Critical for Pecans

This information was taken from Dr. Lenny Wells' Pecan Blog

The nut sizing period normally occurs from May 1 through August 15. Although not a critical water use stage for pecan, serious drought conditions during this period can affect yield. The most common visible effects of an extended drought during this period are excessive nut drop and “shell hardening” on small nuts. Lack of sufficient water during the nut sizing period causes small nuts and may lead to water stage fruit split, resulting from a sudden influx of water during the nut filling stage in some varieties.

The nut filling stage occurs from about August 15 to the first week of October, depending on variety. The most critical period for water use is during the first two weeks of September. Lack of sufficient water during the nut filling stage will lead to poorly filled nuts, which will result in poor nut quality.

Reports from other areas of the country indicate that as much as 350 gallons of water per day can be required by each tree during the nut filling stage. Based on this recommendation, if a mature orchard has a plant density of 12 trees per acre (60' x 60' spacing), then 4,200 gallons per acre per day may be needed. For a density of 20 trees per acre (46.5' x 46.5'), 7,000 gallons per acre per day may be needed.

Pecans can have high water requirements, using as much as 60 inches of total water (including rainfall) during the growing season. Drip and micro-irrigation system design capacity for a mature pecan orchard should be 3,600-6,000 gallons of water per acre per day.

New Sorghum Pest

The sugarcane aphid has been around for a while.  It was first observed in Florida on sugarcane in 1977.  Then in 1999 it was discovered in Louisiana on sugarcane.  It was not until 2013 that it was found in Texas and this time it was found on sorghum. 

Since this discovery it has been found as far east as Alabama and it now looks like it has made it into western Georgia.  Roger Sinyard and Bill Starr responded to a call from a local grower who was seeing something weird in his field.  It is somewhat ironic that we visited a field day in Plains GA, earlier in the week and learned about this new and emerging pest of sorghum. 

When David Buntin (UGA Entomologist) spoke about it I remember thinking that we should have a couple of years before we see it here.  Well, I was wrong.  This aphid can be seriously damaging in more ways than one.  Early infestations can kill or stunt small sorghum.  Late infestations can result in large amounts of honeydew.  This excessive stickiness can interfere with harvesting.

It is unofficial until our entomologist examine the samples sent last week, but we are pretty sure that we are seeing the sugarcane aphid in our area.  to learn more you can visit this site
http://www.amsac.org.mx/docs/PUB0272_SugarcaneAphidPublication.pdf

Disease Resistance

In a year like this you expect to see plenty of Pecan Scab on trees that have not been sprayed.  Pecan scab is always worse in years when we have ample rainfall in early spring.  That is exaclty what we saw this year and last as well.  However if trees are taken care of and the proper fungicides are applied we should be able to control this devastating disease.

Pictures came from Patrick Connors (UGA Pecan Breeder) website

So why are we seeing so much scab in treated orchards?  It could be due to diseases becoming resistant to certain fungicides.  We are not seeing complete resistance like we see with resistant pigweed, but we are seeing a shift in sensitivity to certain fungicides. 

Several local growers have participated in a program offered by UGA.  They have been submitting samples of scab from orchards across their farms and the results are pretty interesting.  Across many of the test sites there was at least some level of insensitivity to several of the fungicides.  

There was low to moderate insesitivity to the triazole fungicides like propiconazole and tebuconazole.  There was low to high insensitivity to strobilurin fungicides like azoxystrobin, and TPTH (Tin).  In the samples submitted there was little to no insensitivity to Dodine and Thiophanate Methyl.

This does not mean that we have widespread disease resistance.  It does make me want to recommend growers submit disease samples for analysis.  If we can find insensitive scab then we can change our spray program to better control the disease.  The only thing that it will cost you is postage and the time it takes to get the sample.

You can get instructions for collecting and submitting samples at the following link
http://www.caes.uga.edu/commodities/fruits/pecan/documents/PecanScabSamplingInstructions-REVISED.pdf

Spray System Cleaning

The basic cleaning methods for agricultural sprayers is to empty the tank on the approved crop.  Fill the tank 10% with water and flush the lines.  If you plan to add a tank cleaner you should do that on the second rinsing.  Fill the tank mostly full on this rinse, and flush the system.  For the third step repeat the initial rinse.

I bring this up because of something I learned at a meeting yesterday.  Dow AgroSciences had a field day to introduce some new technology.  One of the stations talked about sprayer clean out and its improtance.

John Deere conducted a study on a sprayer with a 100 foot boom and 1000 gallon tank.  After spraying the tank out they took the sprayer back to the shop and drained all of the liquid.  So what they collected was water that was in the pumps, low hanging lines, filters, etc.  They collected this water multiple times and ended up with between 50 and 100 gallons of water still in the system. 

So if you were spraying 15 gallons of water per acre you would have enough spray left in the lines to treat almost 7 acres.  This is very important if moving sprayers between highly sensitive crops. and will be very important as we move to new weed resistant crops in the near future.

More Problems for Pests

It is amazing what you will see if you just slow your pace down a notch.  The following are good examples of natural insect control.  These are all from large row crop operations in both Taylor and Peach Counties

 Above is a Damsel Bug that has caught a three cornered alflafa hopper in soybeans

 A Robber Fly that has captured a moth

 This appears to be a caterpillar pest that was killed by a pathogneic fungus.  There are also viruses that kill insects. 

A Syrphid Fly larvae feeding on aphids.

I believe this is some sort of Flea Beetle, and it has an appetite for Pigweed all over Middle Georgia. 

Corn, Cotton, Peanuts and Soybean Field Day

On August 20th there will be a row crop field day in Plains Georgia at the Southwest Georgia Research and Education Center.  Topics will include Peanut Varieties and Cropping Systems, Cotton Insect and Weed Management, Thrips Management and Corn Insect Management.  We will also hear from the UGA Soybean, Cotton and peanut Breeding Programs.

The meeting starts at 8:30 and there will be a sponsored lunch. After lunch there will be a drone demonstration.  Please contact Linda Hagerson if you plan to attend.  229-824-4375, hagerson@uga.edu

Pesticide credits will be available.

If you plan on attending let me know.  Maybe we can carpool.

Bollworm Meets Wasp

Predators and parasites are one of the reasons that we do not have to spray many insecticides in Cotton.

I was in a cotton field with a fairly high number of bollworm larvae.  The size of the worms and where they were on the plant would make it almost impossible to kill them with insectidcides.  This wasp was doing a good job of reducing the pest populations for this cotton grower.

Nothing to Do with Agriculture

But I guarantee this would have scared my daughter out of her shoes.  I found this walkingstick hanging out on her cereal bowl this morning. 

I am glad I got there before she did.  Walkingsticks are herbivores (they eat leaves) and obviously their body helps them blend in with their surroundings.  Unless they are on a princess bowl.

Worms are Everywhere

We are seeing armyworms in grasses and soybeans, budworm/bollworm in cotton, and cutworms in sesame.  Yes I said sesame.  we are even being overrun in the landscape and garden.  Most of these larvae (caterpillars) are immature moths.  The moths fly to a suitable host and lay eggs.  These eggs hatch in about 3 days and the small caterpillars begin to feed. Feeding lasts about 2 weeks.  After the caterpillar has done the damage they usually pupate for about 10 days.  After this time the adult emerges and starts the cycle over again.

Here are some images to help you identify your pest.  You can also visit http://www.bugwood.org/ to view all sorts of insect images from across our area.

Peanut Maturity

We still have plenty of time before peanut harvest, but i had a request for the following chart so i thought i would go ahead and post it.  We know roughly the number of days to maturity for all of our recommended varieties so you shold be able to use this chart to at least determine when you need to start working on the inverter.

For example:  Georgia 06G has a mautirty range of 145 - 150 days.  So if you planted on may 31st you would be at 145 days on October 23rd.  This means that you would probabaly want to start scrapping peanuts the first of October. If you planted into June you can contact me and i will send you the remainder of this chart.

Unusual Yellowing in Soybeans

If you are seeing symptoms like the images below give me a call or post a comment.  We are seeing this yellowing in different areas of middle georgia and are trying to figure out if it is related to variety. 

In affected fields or areas of fields leaves tend to yellow around the edges and some cup upward as seen above.  The only thing that these fields have had in common so far is high numbers of potato leafhopper.  This is the same little insect (1/8" ) that causes hopper burn in peanuts and there are reportedly large migratory populations.

Let me know if you have anything resembling this injury or if you have a heathy population of the above insects.