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Corn Insecticide Seed Treatment Options

Corn Insecticide Seed Treatment Options published on No Comments on Corn Insecticide Seed Treatment Options

Sebe Brown, Extension Entomologist

 Selecting corn seed treatments can be a challenging and expensive undertaking faced by many producers across Louisiana.  Corn seed treatments target three spectrums of pests: nematodes, fungal seedling diseases and insects.  This article will address insecticide seed treatment options available for corn.

Insecticide seed treatments are usually the main component of a seed treatment package.  Most corn seed available today comes with a base package that includes a fungicide and insecticide.  The insecticide options for seed treatments include Poncho (clothianidin), Cruiser/Cruiser Extreme (thiamethoxam) and Gaucho (Imidacloprid).  All three of these products are neonicotinoid chemistries.  Cruiser and Poncho at the 250 (.25 mg AI/seed) rate are the most common base options available for corn.  These insecticides are a good foundation; however, do not expect these treatments to give you extended protection from all below ground pests. If sugarcane beetles have been a problem in the past, Cruiser at the 250 or 500 rate will not provide adequate control; consider using Poncho at the 500 rate with 1250 providing better protection.  None of these products provide adequate control of cutworms.  Each company offers treatments that provide differing levels of early season insect protection, outlined below are some options available to producers with regards to insecticide seed treatments.

Pioneer’s base insecticide seed treatment package consists of Cruiser 250 with Poncho/Votivo 1250 available upon request.  Votivo is a biological agent that protects against nematodes.

Monsanto’s products including corn, soybeans and cotton fall under the Acceleron treatment umbrella.  Dekalb corn seed comes standard with Poncho 250.  Producers also have the option to upgrade to Poncho/Votivo, with Poncho applied at the 500 rate.

Agrisure, Golden Harvest and Garst have a base package with a fungicide and Cruiser 250.  Avicta complete corn is also available; this includes Cruiser 500, fungicide, and nematode protection.

Another option is to buy the minimum insecticide treatment available, and have a dealer treat the seed downstream.

Avipel was re-issued a section 18 for field and sweet corn seed in Louisiana.  The exemption is effective from February 24, 2012 through February 24, 2013.  Avipel can only be applied at the dealer and is used as a humane bird repellent.

It is important to note that below ground Bt traits available for western corn rootworm will not work on our strain of root worm in Louisiana.  Look at using in-furrow applications of Counter (organophosphate) or Force (pyrethroid) to help keep rootworms under control.  If an ALS herbicide was used in burndown applications or is anticipated, organophosphate insecticides should not be used.

Insecticide seed treatments are a valuable tool that allows producers a head start on early season protection from a variety of pests.  Minimizing damage below ground will help get this year’s corn crop off to a promising start.

The LSU AgCenter Explores Biofuels as an Alternative Crop for Growers

The LSU AgCenter Explores Biofuels as an Alternative Crop for Growers published on No Comments on The LSU AgCenter Explores Biofuels as an Alternative Crop for Growers

Authors:  John Kruse, Michael Blazier, Richard Vlosky, Vadim Kochergin, Glenn Hughes, Dek Terrell, Paul Darby, Roger Smithhart

Research scientists and extension specialists from the LSU AgCenter are participating in federally-funded research and extension efforts to explore the potential that biofuel crops may hold for Louisiana producers.   These efforts have great potential to expand the energy production portfolio of Louisiana.  An ambitious five-year study will involve growing and selecting cultivars of energy cane (sugarcane varieties with characteristics better suited for biofuel production than conventional sugar production) and sweet sorghum well-adapted to Louisiana.  Agronomic practices such as planting rates and dates as well as fertility will be developed for these crops.  Processes for converting these crops into an array of biofuels and biochemicals are being developed in partnership with collaborators in the biofuels industry. Louisiana is particularly well-suited to develop biomass crops due to its climate, well-developed agricultural and energy infrastructure, and central location within the U.S.

In another study, a team of researchers led by Dr. Richard Vlosky submitted a survey to producers in Pointe Coupee, Concordia, Catahoula, Tensas, Madison, Richland, West Carroll and East Carroll Parishes, as well as several counties in Mississippi’s Delta region. The purpose of the survey was to gauge initial interest in producing biofuel crops, as well as find out what factors are important to making it a success. Well over 700 surveys were returned, providing a solid sample to study the responses.  Roughly 60% of the respondents farmed less than 250 acres and 40% farmed more than 250 acres. Thirteen percent of the respondents farmed over 1000 acres, providing a good cross-section of producers. When asked their overall opinion of using biomass for bioenergy, two thirds of the respondents were somewhat or extremely positive. Only 17% were pessimistic that a bioenergy market will be competitive relative to conventional energy markets.

When growers were asked about their perceptions of biofuel crops, 56% felt that economically viable technologies already exist for converting biomass to bioenergy and half of all respondents believed that agricultural biomass transportation can be conducted with existing equipment. When it came to on-farm equipment needs, 43% believed that some sort of specialized equipment would be necessary to get the job done.  A plurality (41%) neither agreed nor disagreed with the statement that converting agricultural biomass to bioenergy is a simple process that can be done at most agricultural processing facilities, and almost a third were not sure if agricultural biomass requires utilizing the entire crop as well as residual feedstock. These responses strongly indicate that growing biofuel crops is a new frontier for most producers, so agronomic education will be critical to its successful adoption by growers.

The majority of producers surveyed were clearly willing to give biofuels the benefit of the doubt when it comes to potential impact on the environment, with roughly three-fourths of respondents believing that raising a biofuel crop would not negatively impact wildlife, air and water quality, or soil quality. The majority of growers surveyed felt that government had a clear role to play in the development of this potential market. Two-thirds of respondents felt that tax credits should be given to landowners, harvesters, and companies that produce and utilize biomass for bioenergy. Well over half believed that subsidies should be provided as an incentive to companies for selling biomass residues from agricultural operations. Over 60% agreed that incentive programs should be provided to defray the costs of establishing biomass crop species and that secured loans should be provided to develop and construct commercial-scale bio-refineries. Almost three quarters of responding growers specifically saw a lead role for research institutions such as theLSU AgCenterwhen they agreed that grants should be awarded for research and development capable of advancing biomass production technologies. When it came down to individual participation, the jury is still out: When asked, “Would you be willing to participate in management activities specifically geared toward biomass production from your agricultural land?” the response was virtually evenly split, with 49% saying “No” and 51% saying “Yes.”

The fact that half of responding growers were willing to participate in bioenergy feedstock production and the high percentage of neutral responses to many of the questions indicates that many producers would benefit from additional information. It was also concluded that a gap exists between the desire to utilize agricultural biomass and the current viability of bio-based markets. The survey seems to reveal that a biofuel-based crop production system in Louisiana is still in its infancy, and that many producers are open to the idea of making it part of their production systems. They just need more information before they can make a decision.

 

 

Fall Fertilizer Applications – Are They Worth It?

Fall Fertilizer Applications – Are They Worth It? published on No Comments on Fall Fertilizer Applications – Are They Worth It?

ByDonna S. Morgan, Associate Area Agent, Louisiana Master Farmer Program

Traditional methods of applying fertilizer to cropland primarily include fall applications of Phosphorus (P) and Potassium (K), which are usually broadcast, and then may be incorporated if conditions permit. Nutrients are then left on the soil surface, or slightly beneath, for 6-7 months prior to planting of the crop. Soybeans, for example, are categorized as legumes and therefore fix their own nitrogen, but do require adequate amounts of P and K, if soil tests results recommend it (this is based on soil type and texture, soil pH, previous crops, and other variables). A medium soil type (such as a silt loam or clay loam) would normally require the application of 200#/acre of 0-18-36. If these nutrients are applied this far in advance of planting, is it really beneficial to the crop and to the environment to do so? What happens to the nutrients during typical, heavy winter rainfall events? What if the soil has a high pH (such as those found in the Red River Alluvial soil class) and the Phosphorus becomes bound to the soil particles, thereby becoming unavailable to the plant when it needs it the most? Do you apply the nutrients anyway? Or is a spring application more beneficial? These are some of the questions that prompted a study at the Dean Lee Research Station to determine if fall and spring fertilizer applications, as well as the application methods, had any impact on agronomic traits, yield, and water quality.

 The Louisiana Soybean and Grain Research and Promotion Board funded a project titled “The Effect of Phosphorus and Potassium Application and Timing Methods in Soybeans on Yield and Water Quality”. This project was funded in 2011 and will continue through harvest in 2012.  Dr. Brooks Blanche, (former LSU AgCenter cotton and soybean agronomist), and J Stevens, LSU AgCenter state soil specialist, cooperated with me on this project to ensure accurate agronomic data would be collected and nutrient recommendations would be applicable to this project. This study was implemented in November, 2010 and included a fall broadcast treatment (FBT) of P and K, a spring broadcast treatment (SPT), a spring liquid injected treatment (SLI), as well as an untreated check (UTR). Included in these 12 plots were automatic water sample collectors, also known as ISCO samplers, which were programmed to collect 200 ml of runoff every 5 minutes for four hours. The fall and winter months produced fairly significant rainfall events, where several collections were able to be made. After spring treatments were applied and a Maturity Group V soybean (Pioneer 95Y01) was planted, a lengthy drought ensued, which severely limited the water quality data that was able to be collected and analyzed. Growing conditions were fair to good for most of the growing season, with the exception of the summer months. Stand counts, plant heights, tissue samples, and soil samples were collected throughout the growing season to determine if any differences were seen in high pH conditions with each treatment. The plot was harvested on September 21, 2011 with average grain yields ranging from 32-34 bushels per acre.

 Data collected was analyzed and results showed no statistical differences in yield, plant heights, plant stand populations, and soil and plant tissue P and K levels. Plants heights and stands all fell within acceptable ranges to maximize yields. Soil samples (regardless of timing of sample collection) showed higher levels of Phosphorus across all treatments and adequate levels for Potassium. Phosphorus levels in many of the fields at the Dean Lee Research Station have continued to increase because of the limiting crop removal rate with these nutrients being applied annually. Tissue samples collected at the R3 growth stage showed the plants had sufficient levels of P and K during that growing period. And even though the soybeans visually appeared healthy, yields were compressed across all treatments with the onset of lengthy dry conditions.

 Field variability, equipment failure, and lack of field runoff limited the water sample collections and make comparisons for each treatment difficult, to say the least. Analysis showed no differences in the amount of total Solids, total Phosphorus, and Phosphates that left the field during rainfall events. Even though 31 inches of rain fell from November, 2010 to September, 2011, the majority of events were not sufficient to cause high volumes of runoff from plots. Total Solid levels were high in every treatment, primarily because the field had been sub-soiled after the previous crop harvest, and was bare during the winter months. This was due to lack of residue, cover crop, and even natural vegetation during this time period.

 One statistical difference that was noted was the level of Potassium that left the field in water sample collections. The fall broadcast treatment levels were significantly higher than those of the untreated and spring broadcast. No differences were seen in fall broadcast and spring injected. At this point, conclusions cannot be drawn from one year of data collection, but it is a possibility that Potassium levels were higher in fall treatments due to the high volume of rainfall that occurred during that time period. Potassium is also very water-soluble and this may have affected the levels found in the sample collections. Additional replications of this trial would be needed in order to determine any trends in application timings or methods.

 Though this particular study, under these specific field and environmental conditions, proved no differences in most of the parameters, does not mean the information can’t be useful. If multiple years of data are collected, and no statistical differences are determined, wouldn’t that prove useful to a producer in his nutrient management plans? Variables such as post-harvest field conditions, fertilizer prices, cropping systems, and application equipment all affect when and how nutrients are applied. This also has an effect on how many nutrients enter the surrounding water bodies and contribute to water quality issues related to production agriculture. So answering the question, “Are they worth it?” is more complicated than a simple yes or no. Conducting studies such as this will not only help producers answer these questions to maximize their nutrients, but minimizing water quality and environmental impacts as well.

Current Weather Conditions May Affect Burndown Strategies

Current Weather Conditions May Affect Burndown Strategies published on No Comments on Current Weather Conditions May Affect Burndown Strategies

From: Daniel Stephenson, Ph.D (Weed Scientist), Sebe Brown (Extension Entomologist) and John Kruse, Ph.D. (Cotton and Feedgrain Specialist)

Historically, many corn producers in Louisiana desire to plant corn in February. LSU AgCenter weed scientists and entomologists suggest burndown applications occur 4 to 6 weeks prior to planting to prevent competition from weeds and to remove vegetation that may be infested with insect pests – collectively known as “breaking the green bridge”.

Fields intended for corn should have already received a burndown application; however, weather conditions during January and early February may have prevented herbicide applications. As an example, 14.5 inches of rain were recorded at the Dean Lee Research and Extension Center in Alexandria since January 1.

The wet fields prevented ground application of burndown herbicides. Also, there were only a few days since January 1 that an airplane was able to make these applications due to wind conditions. As a consequence, Louisiana producers may be faced with weedy fields that are intended for corn.

A failure to “start clean” can greatly influence corn yields. Data have shown that corn determines its leaf orientation very soon after emergence. Leaf orientation perpendicular to the planted row is desired for maximum light interception, which influences growth and yield potential. If a spiking corn plant perceives any competition from an adjacent winter weed, the leaf orientation will be altered, thus potentially reducing that corn plant’s ability to intercept enough light for maximum yield. Therefore, planting into a weed-free field is very important.

Focus on Weed Control

Traditionally, a burndown application of glyphosate plus 2,4-D has been the standard protocol. This treatment usually provides good to excellent control of many winter/spring annual weeds common in Louisiana fields.

When applied 4 to 6 weeks prior to planting, a producer has time to evaluate the efficacy of glyphosate plus 2,4-D and decide if an additional herbicide treatment is needed prior to planting. If a producer is prevented from applying the burndown application in a timely manner, then weed competition and insect pressure may be an issue for emerging corn. Henbit in particular may be a refuge for cutworms and spider mites.

If a field scheduled for corn has received a burndown application, then these fields need to be evaluated to determine if corn will be planted into a “clean” field.

If the weather has prevented a burndown application and a producer intends to plant corn within the next few weeks, several factors must be considered.

The first issue is the 2,4-D plant-back restriction, which is 7 days for corn. If you are within this window, then you should not apply 2,4-D, to prevent herbicide injury to the corn. Second, maximum efficacy of glyphosate will not be observed until 21 to 28 days after application, so glyphosate applied 7 to 10 days before planting may not provide acceptable weed control and may allow insect populations to survive.

If a producer is within 7 to 14 days of planting corn, he/she should consider the following burndown treatments:

  • Gramoxone SL at 1.5 qt/A plus atrazine at 1 lb ai/A plus 0.25% v/v nonionic surfactant.
  • Gramoxone SL at 1 qt/A plus Leadoff at 1.5 oz/A plus 0.25% v/v nonionic surfactant.

Gramoxone SL will provide control of existing weeds, but coverage is essential. Therefore, a minimum of 12 gallons of water per acre and flat-fan nozzles should be utilized to maximize coverage. Also, Gramoxone SL efficacy can be increased when the air temperature is high and cloud cover is minimal.

Atrazine or Leadoff will assist Gramoxone SL with control by providing residual activity on winter/spring weeds during the first few weeks after corn emergence – if beds are not disturbed at planting. However, if an organophosphate insecticide will be applied in-furrow when planting corn, then Leadoff cannot be applied or injury will occur.

Focus on Insect Control

At-plant bands or post-emergence pyrethroid applications can be used to control cutworms; however, the infestation needs to be detected early to minimize stand loss. Moist soils will help incorporate the application to improve efficacy on any cutworms that may be located below the surface.

Foliar insecticide applications can be applied in bands behind the planter in reduced tillage fields. At planting soil insecticides such as Lorsban 15G can be t-banded with corn to help control cutworms pre-emergence. Lorsban should not be planted in furrow due to possible phytotoxicity. It is important to note that the use of ALS inhibiting herbicides with organophosphates such as Counter and Lorsban have the ability to cause significant crop injury.

If producers used Leadoff in their burn down strategy then Counter should not be used at all, to prevent any negative effects between the two chemicals. Lorsban has greater crop safety than Counter when used in conjunction with ALS inhibiting herbicides.

Force 3G can also be used at plant to help protect against cutworms. Force 3G is a pyrethroid insecticide and the ALS interaction is not a factor. Counter is not effective for control of cutworms but useful for rootworms.

Planting corn into a weed-free field is a must to maximize yield. Regardless of when you apply a burndown treatment, a producer must strive to “start clean”.

Wheat: Cold Weather Means Risk

Wheat: Cold Weather Means Risk published on No Comments on Wheat: Cold Weather Means Risk

We are forecast to finally have some real winter over the next few days. Unfortunately, much of our wheat has already moved on to spring. Temperatures in Baton Rouge are forecast to reach 28–30 ˚F Saturday night. In Monroe (along I-20 in north Louisiana) temperatures are forecast to reach 22-24 ˚F, 18 ˚F at Greenville, MS, and 16 ˚F at El Dorado, AR.

The forecast has been in a state of flux over the past couple of days and it is hard to know what will really happen. I am pretty confident that we will have some freeze damage to wheat this weekend but it is difficult to predict how much. The good news is that it is still very early in the growing season, wheat has lots of time to recover, and wheat is a very resilient crop.

Wheat that is not jointed will not suffer anything more than superficial leaf burn at 20 ˚F. Our wheat has been growing very rapidly and there are lots of tender leaves that will have the tips burned, but this should not impact yield. Prior to jointing wheat is very tolerant of cold weather and damage is infrequent and superficial. Wheat becomes much more vulnerable to freeze damage as it progresses from first node to flowering. Hopefully we will have a cool February and not have to address that issue. There is really not much that can be done at this point. The chart below (borrowed from http://www.ksre.ksu.edu/library/crpsl2/c646.pdf)

shows the relationship between growth stage, temperature, and freeze damage. The months that correspond to the growth stages are appropriate for Kansas, not Louisiana. The growth stages are valid, except that tillering occurs all winter in Louisiana.

*** CLICK ON IMAGE TO ENLARGE ***

 

*** CLICK ON TABLE TO ENLARGE ***

 

Wheat that has jointed (Feeke’s GS 6) will start to sustain significant damage around 24-26 ˚F. This damage can manifest in several ways. Stems can freeze on one side which weakens stems and can result in lodging at heading and poor grain fill due to inability to supply the developing head with adequate water and nutrients; or stems can completely freeze at the soft growing point resulting in loss of that tiller.

The link below is a good summary of spring freeze damage symptoms in wheat from our friends at Mississippi State. . http://msucares.com/crops/wheat/faq7_damage.html

The amount of damage on tillered wheat will depend on temperature and duration of exposure. I suspect that most of the wheat in Louisiana will only sustain superficial damage. I do know that there are some fields that have one and maybe even two nodes showing and these will be hurt. It normally takes a couple of days after a freeze before symptoms are easily apparent. This comes in the form of dead and dying tissue; lodging and discolored tillers; and a distinct odor of rotting tissue. Again, we won’t know the extent of damage until early next week and there is still a lot of time for the plants to form new tillers and make a near-normal yield. I’m sure the internet will be abuzz with freeze damage discussions next week

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