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'Do I Spray Today?'

It’s a common dilemma every summer: You’ve got to try to avoid application spray drift, but you also have to get the fields sprayed so your growers harvest top yields.

Senior Associate Editor
Aerial application
Retailers have to balance the concerns about
spray drift with the need to get the job done.

It’s a decision each custom applicator faces many times during the growing season, whether behind the wheel of a spray rig or piloting an aircraft: Will I get the corn and soybean acres sprayed today?

Spray orders in hand, this is a person who’s eager to climb into the cab or cockpit, rev up the engine, and tackle the day’s workload. But whether the goal is to combat pests or boost plant strength for higher yields and increased grower profits, he must first ensure the environmental and weather factors are conducive to a safe, uneventful ride, keeping in mind the possibility of drifting — and costly — ag chemical spray landing in the wrong place.

So how do retailers balance the concerns about spray drift with the need to get the job done?

New Products Reduce Drift

Some of the more recent innovations available to assist in mitigating pesticide spray drift include:
   High Speed Nozzle from Greenleaf Technologies, Inc. Still being tested throughout the U.S., Canada, and Europe, this nozzle is essentially the company’s TurboDrop TwinFan nozzle modified for fast self-propelled sprayer speeds. Instead of a 30/30-degree angle design, the nozzle will be “hitched back” to allow the fine front spray and medium back spray to direct the product deep into the canopy at fast application speeds. It will be available on a limited basis this year.
   Agricultural Windsock from Airport Windsock Corp. This windsock is specifically calibrated for the wind speed range applicable to ag crop spraying. The angle of the windsock indicates relevant wind speed; as the wind speed increases, the windsock’s corresponding extended angle changes in response. The wind speed calibration angles are printed on the side for easy reference (see image, left). By indicating wind speed and direction, the applicator can effectively determine the risks of off-target spray drift. The windsock costs $39.95 and comes complete with a pole and universal mounting hardware and can be found at www.airportwindsocks.com.
   Automated Boom Height Control from Ag-Chem. Available on Ag-Chem’s RoGator sprayer, the sensor-based technology helps keep the boom at the optimum spraying height throughout the field, regardless of terrain, reducing drift potential. Although introduced a couple years ago, this is still a relatively new technology for retailers.
   Digitized plat maps from BASF and Rockford Map Publishers. This program was developed to help reduce spraying errors by ag aviators hired to spray product in unfamiliar territory. When an application order is made, the retailer uses the geoPDF to positively identify the field border and areas of safety concern, completes the order, and e-mails the information to the hired flying service. The pilot incorporates the information into a geographical information system and loads it into the cockpit. BASF has sponsored training sessions for Illinois and Wisconsin for this year; the companies hope to have this technology available in other states in 2009.
   BoomTrac Pro and Guardian spray nozzle from John Deere. BoomTrac Pro was introduced in 2007 on John Deere’s 4730 and 4830 sprayers, and is also available on the 4930 sprayer. It uses ultrasonic sensors to maintain a consistent boom height for optimal nozzle and spray tip performance. The Guardian spray nozzle, part of the SprayMaster line, is designed to be a fungicide nozzle. It maintains a medium droplet size through a large range of pressures even as the spray rig slows down or speeds up for optimal coverage and to reduce drift.
   Coverage G20 adjuvant from Wilbur-Ellis Co. This enhanced deposition and drift aid is designed to deliver 20% more glyphosate on target, reducing potential spray drift.
   Prolec adjuvant from Brandt Consolidated, Inc. This wetter/ spreader/drift control agent can also acidify the spray water.

So Many Factors

With so many factors in play, it’s a decision that has to be made on a case-by-case basis, says Jim Loar, vice president of Wilbur-Ellis Co., a CropLife 100 dealership headquartered in San Francisco, CA.

“It’s situational,” he says. “Each individual job should be evaluated on its own set of circumstances.”

Loar’s list of considerations includes staff/consultant recommendations; the type of equipment, spray tips, and nozzles; the environmental factors of the day, such as wind direction, wind speed, humidity, and temperature; geographical factors, such as the location of houses, farm animals, and the neighbor’s crop; and crop stage.

Wilbur-Ellis employs many full-time applicators at its 132 outlets in 16 states, offering application options ranging from ground rigs to helicopters to planes. And yet last season, all that wasn’t quite enough; requests for fungicide applications for crop health caused the company to hire in contract aerial application services.

Loar expects more of the same this season, “particularly given today’s crop prices,” he says. More spraying means more opportunity for accidental spray drift to occur.

Education Is Key

Making sure growers have the right tools and education helps Sims Fertilizer & Chemical Co. of Osbourne, KS, in its mission to reduce spray drift events. The independent CropLife 100 dealership sells inputs in six states to growers doing their own spray application. “We are always encouraging them to use spray drift retardants and other tools to help reduce drift,” says Kathy Sims, president. “Air induction nozzles also have really cut down on our farmers having problems with drift.”

The dealership has an educational pamphlet ready to give to new applicators. “And we’re trying to put information on our Web site,” she says.
Wilbur-Ellis focuses on employee training. “We have very robust training programs for applicators as well as our people who write recommendations, and understand the actual drift reduction technologies that are available to us,” Loar says.

All the training and education provides a solid grounding, but in the end, it comes down to the custom applicator’s common sense.

“Ultimately, there’s no one rule,” Loar says. “I think all factors have to be considered and good business decisions made.”

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CropLife 100: Custom Application Report
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