Friday, June 28, 2013

General Conditions


Bailey and Parmer Counties as well as most of the rest of the South Plains and Panhandle of Texas continue
to be in extreme to exceptional drought according to the U.S. Drought Monitor (June 25, 2013).
While June precipitation  was a definite blessing it has been no where near enough to pull the area out of the extremely dry conditions experienced over the last two and now going on three years.

Area crops look remarkably well considering the harsh environmental conditions  thus far, but signs of stress can be seen across the landscape. Year to date local weather stations have only recorded 1 rain event which was equal to or grater than 1 inch each (Friona, Muleshoe, and Muleshoe Wildlife Refuge) while the Clovis, NM site has yet to record an inch or more rainfall event.

*Daily estimated crop water demands (inches of water per day) based on PET data from Halfway. 

Corn showing drought stress



* DD 60 based on May 1

Weed Management

Weeds continue to be the primary pests area producers are having to deal with. Producers have continued to report suspected glyphosate resistant pigweed most, of which are small spots within fields.  These spots need to be addressed quickly and decisively.  Assuming a sprayer glitch could be costly if the weeds turned out to be resistant to glyphosate and are allowed to go to seed.

Most weed control operations have been completed in corn but are on going in sorghum, cotton, and other crops. Hot dry conditions are making weeds tougher to control.

Huskie  is a new herbicide for sorghum which has shown to be very effective. Normally a half pound/of atrazine and 1 lb of ammonium sulfate on a per acre basis should be  included in the tank mix to enhance weed control. Under good growing conditions ground applications should be made in a minimum of 10 gallons per acre (GPA) total volume and under tough conditions 15-20 GPA. I realize that high volumes of water may slow spray operations but the risk of unsatisfactory weed control should be considered.

Pigweed

Corn Update

Corn is growing rapidly and moisture demands are quickly climbing exceeding .40 inches per day.  Green snap has been observed in many area fields recently in varying degrees. Green snap may occur when corn is rapidly growing and is exposed to high winds. Several factors contribute to risk of green snap, first and foremost is wind velocity and condition of the plant. The faster the corn is growing the more susceptible it is to green snap. The use of phenoxy herbicides (ie dicamba, 2,4-D, ect) may also contribute to green snap.  Different corn hybrids may be more or less disposed to green snap; most seed companies rate their hybrids as they are developed.
Green snap in corn

Spider Mite Managemnt

Spider mites have been observed in some area corn but for the most part in fairly low numbers. As corn approaches silk we need to really think about what pest management tactics may be implemented. For example if an insecticide application for corn rootworm beetles will likely be made then that insecticides impact on beneficial arthropods and resulting mite flare up should be considered and a mitigating plan developed. If  spider mites are established in a field which will be treated for CRW beetles a preventative miticide application about two weeks prior to silk should be contemplated. Currently labeled miticides are designed to work in concert with natural enemies of spider mites, when these beneficials are removed from the equation the product efficacy may be adversely affected. In research conducted in 2012 under relatively heavy mite pressure and where beneficials were removed from the system with a previous insecticide application I found that miticides struggled to suppress mites below economic threshold. That is not to say they did not work because they did, I had the luxury of an untreated check to compare the miticide treatments too.  If it weren't for the untreated check to compare too most would consider the mite suppression unsatisfactory.
Untreated

Treated

Cotton Update

The area cotton crop is extremely variable ranging from very good, to beat up but beginning to turn the corner, to just emerged due to late rains. The larger cotton is squaring, the square sets have been near 100% in observed fields. Squaring cotton should be closely monitored for square robbing pests. The cotton fleahopper can be a significant pest from 1st square to first bloom in Texas High Plains cotton.  Fleahoppers can easily disperse from wild hosts to cotton by flight.  The good news at this point is very few have been collected in local surveys sampling weeds growing in ditches and uncultivated land. Adult fleahoppers are yellowish green to almost off white and approximately 1/8 inch long with an oval flattened shaped body.  They have piercing and sucking mouthparts.  Nymphs, the immature stage, look similar to the adult but smaller and without wings.  Cotton fleahoppers, especially nymphs, have a somewhat translucent appearance.  Small black spots may also be present on the back, legs, and antennae.  Fleahoppers are very flighty and will rapidly move when disturbed. Both adult and immature cotton fleahoppers will feed on tender vegetation including terminal growth, leaf buds and small squares.  Pinhead sized squares are most vulnerable and will take on a blasted appearance 1 to 3 days after the feeding occurs.  High populations of fleahoppers may cause excessive square shed. Twenty five to thirty cotton fleahoppers per 100 plants and unacceptable square shed (90% square set during the 1st  week of squaring and 85% the 2nd week) is the established action threshold.
Adult cotton fleahopper, Monti Vandiver

Tuesday, June 18, 2013

General Conditions

Recent precipitation has certainly been welcomed even though some crops and property have been damaged.  Rainfall amounts have varied greatly, individual amounts ranging from a trace to 2+ inches have been reported. NOAA weather stations have recorded 1.19 Clovis, 1.61 Friona, 2.38 Muleshoe, and 3.94 Muleshoe NWR in June. Even with recent precipitation the area continues to be well behind the long term average; currently, comparing the area wide year to date average to the area long term average we are right at 57% of the historical average (see the precipitation figure for more detail). 




Dryland Cotton

Dryland cotton actually received enough precipitation to emerge in some fields but many are already running out of moisture since we had no sub-soil moisture to base recent precipitation on. In addition, blowing sand has continued to plague area producers. Fields with poor soil tilth as a result of 2+ years of exceptional drought have been particularly difficult to “tie down”.

 
Emerging cotton

Weeds Have "Taken Off"

Small morningglory
Weeds have really “taken off” after recent precipitation and should be managed aggressively, we do not need to allow them to use precious moisture. Remember many herbicides have crop stage limitations, read labels carefully to avoid risk of crop injury.  The key to a successful and sustainable weed management is the use of a multi-tactic approach. When considering herbicide applications try not to rely on a single mode of action. Using herbicides with different modes of action and/or tillage will reduce risks of resistance development. Another consideration when making herbicide applications is off target injury, whether it be drift or spray tank contamination. The following is a quick list of drift related topics to consider: environmental conditions (wind speed, direction, temperature, inversion conditions, etc), herbicide volatility, spray volume and droplet size,  ground speed and spray pressure. Sprayer cleanup is critical especially when a spray rig is used with various herbicides and on different crops. A good article published by the University of Missouri on sprayer cleanup can be found at http://goo.gl/ASg0V

Potential drift situation

Thrips Persist in Cotton

General thrips pressure
Thrips persist in area cotton at low to high levels depending on previous management tactics. Seed treatments have held up pretty well but have began to lose effectiveness in many fields and may not protect cotton through the key 5th true leaf stage. The  tell-tale sign that a seed treatment insecticide is wearing off is the presence of immature thrips. Foliar applications of acephate have been effective but don't expect residual activity past 5-7 days. The accepted treatment threshold is 1 thrips/true leaf but if cotton is slow growing the threshold should be reduced to 1/2 thrips/true leaf. 

Spider Mites in Corn and Sorghum

General spider mite pressure
Spider mite pressure overall has seemed to declined, probably a result of recent showers. Spider mites are very small, 1/32 inch or less, and are difficult to see without magnification unless colonies are well developed. Eggs are very small pearly white spheres. Mites will migrate into corn from wheat or native grasses with the aid of wind. They will lay eggs on the underside of corn leaves which will hatch in 3-4 days. Larvae/nymphs will mature and begin laying eggs in 5-10 days. There may be 7 to 10 overlapping generations per growing season. Hot dry conditions favor rapid development of mite populations particularly after tassel.

Banks grass mites typically infest lower leaves first then move up the plant while two spotted mites may infest any leaf at any time. Banks grass mite and two spotted mite infestations of similar densities will result in similar damage. 

In fields with established mite colonies and a history of spider mite infestations a preventive miticide application should be considered. There are several foliar miticides which can be applied early season to reduce risks associated with spider mites. Remember current miticides are not systemic and will only protect the leaves which are sprayed and any subsequent growth will not be protected. Some of these pesticides are soft on beneficial organisms and may allow natural enemy populations to become established which will result in a more stable production system.


Fall armyworms

Fall armyworms (FAW) have been observed in non-Bt corn fields feeding in whorls. Preliminary data from a trial evaluating Double Pro and SmartStax Bt technologies suggest they are both very effective in suppressing foliage feeding FAW, more time to fully evaluate the trial will hopefully confirm early data. FAW moths deposit eggs on leaves. Newly hatched larvae begin to feed in the whorl. Larval feeding will cause the leaves to appear ragged, but insecticide treatments are seldom recommended. In extreme cases where treatment may be justified foliar applications of newer pesticides (Prevathon, Belt) have shown to provide suppression of whorl feeding FAW in a limited number of trials. Chemigation of a labeled insecticide active on FAW may be another management tactic to consider. As sorghum gets larger it will be very attractive to FAW; management options are limited since fewer insecticides are labeled for use in sorghum.


FAW feeding 4 days after hatch

Monday, June 10, 2013

Fall wheat seed; drought, freeze and hail limit supplies

Writer: Kay Ledbetter, 806-677-5608, skledbetter@ag.tamu.edu
Contact: Dr. Jackie Rudd, 806-677-5600,  jcrudd@ag.tamu.edu
Steve Brown, 940-552-6226, rsbrown@ag.tamu.edu 

The question of wheat seed availability is still to be answered, because none of it is in the bin yet, according to Steve Brown, Texas A&M Foundation Seed manager in Vernon.

“From a seed availability standpoint, for those of you who will be looking for specific varieties, I would talk to your seed dealers now,” Brown said. “Some of those guys are already pulling wheat out of South Texas for varieties that perform up here.

“One of the nice things about some of the TAM varieties is they are very broadly adapted. So, some of the same varieties grown south of San Antonio are some of the high input varieties that grow up here in the Panhandle.”

He said seed dealers are already scrambling trying to take care of their customers for next year.

“Some of the wheat looks better than it did two and three weeks ago. I have been surprised at what we are seeing as it continues to grow,” Brown said. “In the Rolling Plains and south to Abilene where we had some freezes, but not as many as up in the Panhandle, we had a little rain. Some of the guys who stayed with it are going to cut some wheat.

“The problem we have in that part of the state is most of the wheat we will cut will be off of secondary tillers. We have already had temperatures of 104 and 105 degrees in the Rolling Plains, so this wheat is trying to finish in the heat. So my expectation is test weights will be low.”

Brown said the State Seed and Plant Board met earlier this week to consider recertification of wheat seed. In years with a big loss of seed wheat due to natural disasters, recertification can be used to relax the normal requirements for seed certification.

Recertification was approved, he said, but that does not necessarily solve the problem. In some areas of the state where harvest has been completed, it will be impossible to recertify in those areas unless fields were inspected in advance of harvest.

For recertification to occur, the applicant must be a certified grower or conditioner, he explained. The land where the variety is grown must meet all criteria for seed certification. All application paperwork must be completed and sent to the Texas Department of Agriculture and the field must be inspected in advance of harvest.

He explained any big loss of seed is not a one-year problem; it can be a two-year problem. This is because not only the Certified class is affected, but also the Foundation and Registered classes are affected. The Foundation and Registered classes are the ones used to produce the Certified class which is most typically used by the commercial producer.

Early harvest has proven to have much lower yields and test weights, Brown said. Lower test weights indicate that seed count per pound will be higher. Seed counts will be very important for fall planting so producers can make appropriate determinations of how much seed to plant.

“If you lose that Foundation-registered class in your seed production, then the start-up again takes a lot longer. That recertification generally is more likely to happen when you have other places to go to recertify things. But trying to find a field, especially a dryland field, which would meet certification requirements and has any wheat to harvest, is going to be a problem this year.

“Talk to your seed dealers. Most of them can’t tell you what they are going to harvest yet, and I can’t tell you what we are going to harvest yet either.”

Brown said a list a varieties and their performance, as well as seed dealers, can be found by going online to http://varietytesting.tamu.edu/wheat/ and http://www.texasseedtrade.com/cms/.

Dr. Travis Miller, Texas A&M AgriLife Extension Service program leader for soil and crop science in College Station, said cooler spring weather experienced across most of the state has helped what would have been a 50 to 60 percent loss of the state’s wheat yield to be only a 25 to 30 percent loss.

“Although it is still a little speculative at this point,” Miller said. “We know we had significant losses – 25 is a conservative estimate and 40 percent plus might be closer.”

He said many fields where yields looked marginal after the first freeze events did not receive additional irrigation and will experience higher losses.

Dr. Jackie Rudd, Texas A&M AgriLife Research wheat breeder in Amarillo, said the primary breeding locations that suffered damage this year due to drought and freeze were the Bushland dryland nursery, which suffered heavy losses, and the Chillicothe nursery, which saw 50-60 percent yield loss and a lot of sterility.

“The sterility means we have outcrossing, so we can’t go harvest it and think it is self-pollinated, so no seed source there for further breeding development of new varieties,” he said.

Bushland irrigated nurseries looked better, but a May 28 hail storm eliminated the rest of it, Rudd said.

“We have a lot of things growing at Castroville, and while we normally don’t harvest there, we needed to get what we could,” he said. “That field also was broken over by an earlier hail storm, but it was still harvested by hand off the ground and the germplasm was brought back to Amarillo.”

Dr. Calvin Trostle, AgriLife Extension agronomist in Lubbock, said as producers scramble around for seed, those who are fortunate to harvest some need to remember the Plant Variety Protection Act.

“Most of these varieties are protected and you have to have permission to do anything other than collecting and cleaning what you can use in your own farming operation,” Trostle warned. “You can’t sell a protected variety to a neighbor as seed.”

For more information on the Plant Variety Protection Act and what can and cannot be done with harvested seed, producers should access AgriLife Extension’s “The Plant Variety Protection Act: Information for Texas Small Grains Producers” (E-338), available at http://agrilifebookstore.org .

Agriculture Secretary Town Hall June 14 in Lubbock

The U.S. Department of Agriculture invites you to a town hall on the Food, Farm, and Jobs Bill with United States Agriculture Secretary Thomas J. Vilsack
                                                                                                                                                                                             
Friday, June 14, 2013 • 10:00-11:30am
Doors open at 9:15 a.m.

Museum of Texas Tech University
Helen DeVitt Jones Sculpture Court
enter through the west doors
3301 4th Street
Lubbock, TX 79415

On Friday, June 14, U.S. Agriculture Secretary Tom Vilsack will host a Town Hall with Former Congressman Larry Combest to discuss the need for the passage of a Food, Farm, and Jobs Bill.

The event is free of charge, space is limited and seats will be available on a first-come, first-served basis. Parking is available on site.

Please RSVP by email to Brenda.carlson@tx.usda.gov with your full name, organization, email address, and phone number.  Contact Brenda Carlson with any questions at 979-680-5213.

Thursday, June 6, 2013

Harsh Environmental Conditions

Hail Damaged Cotton
Harsh environmental conditions continue to plague the NWP of Texas. The exceptionally dry conditions have dominated local weather even though some much needed precipitation was received June 5. The NWP is right at 50% of the long term average precipitation year to date while the May 1 to date heat unit accumulations are slightly ahead of the long term average.

Very high winds associated with recent storm fronts have added “insult to injury”, damaging crops, sprinkler irrigation systems, and power poles. Precipitation recorded by local weather stations ranged from .5 inch to 1.5 inches; some storms also contained damaging hail. Cotton stand counts less than .2 plants/foot and corn with severe leaf burn have been observed in fields in the path of these storms. The injury to corn at this stage should not result in measurable yield loss. A good article talking about wind and sandblasting damage to corn published by Purdue University can be found at http://goo.gl/ZpQtm . Much of the area cotton on the other had has sustained varying degrees of damage, some of which is severe.

On the brighter side, irrigated crops not subjected to or more tolerant of the severe conditions associated with the recent storms look pretty good and in some cases very good. Crops are behind in development compared to last year, for example most cotton is in the cotyledon to 2 true leaf stage compared to 3-4 true leaf stage for the same time last year. Crop moisture demands remain fairly low but will soon rapidly increase, especially in corn.




Thrips in Cotton

General Thrips Pressure
Thrips pressure in cotton continues to climb in the NWP of Texas. I have observed immature thrips in some cotton which had a seed treatment insecticide applied. If immature thrips are present following seed treatments then the treatment has lost or is losing its effectiveness. 
Treatment thresholds for thrips in cotton are dynamic; under good growing conditions a foliar treatment should be considered when 1 thrips/true leaf is present but in cotton which is growing slowly due to poor environmental conditions or other stress the threshold should be reduced by 1/2.  Area cotton which has been injured by recent storms should be closely monitored as it cannot afford additional loss of leaf tissue. The lack of leaf surface area will make application coverage even more important.
I can not stress enough the need make timely insecticide applications for thrips. Insecticide applications made based on visual plant symptoms are late and will not provide the economic benefit of a timely application and is what I like to call a “revenge” treatment.

 
Environmentally damaged cotton

Glyphosate Resistant Pigweed

I have received several reports of potential glyphosate resistant pigweed. We need to be diligent in managing weeds using multiple and timely tactics.



Pigweed

Spider Mites in Corn and Sorghum

General spider mite pressure 
Spider mites have been observed in area (NWP of Texas) corn and sorghum, particularly on field margins. Now would be a good time to start developing a spider mite management plan, primary strategies are threshold based curative methods or a preventative approach.  Regardless of the management strategy employed it is critical to conserve “beneficials”.
When considering a preventative miticide application remember current  products are not systemic and will only protect the leaves which are sprayed and any subsequent growth will not be protected. Applications to small corn or sorghum are also less cost effective when considering less of the miticide is intercepted by the plant versus an application made to larger crop near canopy closure. The additional application cost of a “dedicated” preventative miticide application would likely be a good trade for the added protection offered by more crop coverage.