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<br />Check all tubes and chisels shanks to make sure they are free of debris and
<br />obstructions.
<br />Check and clean the orifice plates.
<br />Center Pivot Applications
<br />Wind Speed
<br />• For lateral move or center pfyot applications: l) not using a solidstream Type nozzle, OR 2)
<br />having a relaasa height or spray height greater than 4 feet, OR 3) having 30 lbs or greater
<br />PSI at the sprinkler stead, w nd speed at the appiicatiDn site must be a minimum of 2 mph
<br />atthe start of the appI mtionor forecasted to reach 5 mph during the application and the
<br />maximum Wlnd speed is 10 mph.
<br />• For lateral move or center pivof applications using: 1) solid stream, AND 2) having release
<br />height and spray height less than 4 feet, AND 3) having 29lbs. or less PSI at the sprinkler
<br />head, wind speed at the application site must be a minimum of 2 mph at tttestart of the
<br />application or forecasted to reach 5 mph during the application and the maximum wind
<br />speed is 25 mph.
<br />Weather Conditions
<br />• To determine if unfavorable weather conditions exist or are predicted (see kfentifytng
<br />Unfavorable Weather Conditions section) and whether an application should
<br />proceed, the National Weather Service weather forecast.must be checked by the certified
<br />applicator supervising the application:
<br />o on the day of, but prior to the start of the application, and
<br />o on a daily basis during the application if the time period from the startof the application
<br />until the application is earn fare. is greater than 24 hours.
<br />• Do not apply if air aU-stagnatton advisory issued by the National Weather Service Is in
<br />effect for the area in which the. application is planned, during the application, or the 48
<br />hours after the application is complete.
<br />• bo not apply if light wind conditions (z. 2 mph) are forecast to persist for more than 18
<br />consecutive hours from the time the application starts until 48 hours after the application
<br />Is complete.
<br />• Detailed National Weather Service forecasts for local weather conditions; wind speed,
<br />and air stagnation advisories may be obtained online at: htiD://www.nws.noaa.gav
<br />on NOAA weather radio, or by contacting your local National Weather Service Forecasting
<br />Office,
<br />Identifyldg Unfavorable Weather Conditions
<br />■ Unfavorable weather conditions block upward movement of air, which results in trapping
<br />fumigantvapors near the ground, The resulting air mass can move off-sife in unpredictable
<br />directions. These conditions typically exist prior to sunset and conflnue past sunrise and
<br />persist as late as noontime. Unfavorable conditions are common on nights with limited
<br />cloud r9'
<br />andifghttonowind and their presence can beindicated byground fog orsmog
<br />and can aISD be identified by smoke from a ground source that flattens out below a ceiling
<br />layer and moves laterally in a concentrated cloud.
<br />Soil Conditions
<br />• Soil must be in good fifth, free of large clods, and tilled at a minimum to the depth of the
<br />treatmentzone. Large clods' can prevent effective soil sealing and reduce effectiveness
<br />of the application. If subsurface soil compaction layers (hardpans) are present within the
<br />Intended fumigation treatment zone, a deep tillage to fracture these layers must occur prior
<br />to or during the sell fumigant application.
<br />• Plant residue that is, present must not interfere with the application or the soil seal. Non -
<br />decomposed plant material may harbor pests that will not be controlled by fumigation.
<br />Except when applying over cover crops as set forth in the Product Instructions, crop
<br />residue that is present must tie flat to permit the soil to be sealed effectively and limit
<br />the natural "chimneys" that may occur in the soil when plant residue is present. These
<br />"chimneys" allow the soil fumigants to move through the soil quickly, and escape into the
<br />atmosphere. This may create potentially harmful conditions for workers and bystanders
<br />and limits the. efficacy of the fumigant. Plant residue on the field serves to prevent soil
<br />erosion from both wind and water.
<br />Soft Temperature
<br />• At the beginning of the application, the soil temperature at the injection depth must be
<br />between 35° and 90°F, measured at 3 inches in depth.
<br />• If air temperatures have been above 100°F in any of the three days pilot to application,
<br />then soil temperature must be measured and recorded )n the FMR. Record temperature
<br />measurements at the application depth or 12 inches, whichever is shallower.
<br />Soil Moisture
<br />• The soil moisture in the top six inches. of soil must be between 60% to 80% of available
<br />water capacity immediately prior to the application, subject to the exception below.
<br />• EXCEPTION: In areas where soil moisture must exceed avaffable water capacity to form a
<br />bad (e.g., certain regions in Florida), soil moisture content may exceed tha 80°A.
<br />• If appropriate measuring equipment is not used to determine whethertha sell moisture
<br />in the. top six inches of soil is between 60% to iii)% available water capacity immediately
<br />prior the application, the USDA Fee/ and Appearance Method test may be used to
<br />estimate whether the 607
<br />to &0%soil moisture cpntent requirement fs met:
<br />o For coarse textured soils (fine sand and loamy fine sand) there must be enough
<br />Scctai; n44_ 013.rndd 9
<br />moisture (50 - 75% of available water capacity) to form a weak bail with loose and
<br />clustered sand grains on fingers, darkened color, moderate water staining on fingers,
<br />will not ribbon.
<br />a For moderately coarse textured soils (sandy loam and line sandy loam) there must
<br />be enough moisture (50 -75°A of available water capacity) to form a ball with defined
<br />finger marks, very light soil/water staining on fingers, darkened color will not stick_
<br />o Formedium textured soils (sandy clay loam, loam, and silt loam) there must be enough
<br />moisture (50 - 75°% of available water capacity) to form a ball; very light staining on
<br />fingers, darkened color; pliable, and forms a weak ribbon between the thumb and
<br />forefinger.
<br />o For fine textured soils (clay, ciay loam, and silty clay loam) there must be enough
<br />moisture (501- 7501• of available water capacity) to farm a smooth ball with defined
<br />finger marks, light soil/water stalhing on fingers, ribbons between thumb and
<br />forefinger.
<br />o For fields with more than one soil texture, soil moisture content in the lightest
<br />textured (mostsandy) areas must comply with this sof soil moisture requirement., The
<br />field may be divided into areas of similar, soil texture and tha soil moisture ach
<br />area should be adjusted as needed. Coarser textured soils can be fumigated under
<br />conditionsofhighersoilmoisturathanff rt"turedsoils;however,ifthesoilmoisture
<br />istoo high, fumigant movement will be retarded and effectiveness of the treatment will
<br />tie reduced.. Previous and/or local experience with tfie sail to be treated or the crap to
<br />be planted can often serve as a guide to,conditions thatwill be acceptable. If there is
<br />uncertainty is determining the soil moisture content of the area to be treated, a local
<br />extension service
<br />ors
<br />conservationistorpestrror0ol advisor (agriculture consultant)
<br />should be -in
<br />for assistance.
<br />• if there Is insufficient moisture throughout the top six inches of soil Immediatelyppriortothe
<br />application, the soil moisture must be adjusted. If there is adequate soil moisture below
<br />six inches, soli moisture can be brought to the surface by tillage prior to the application.
<br />To conserve soil moisture, tillage should be done as close to the tima of application as
<br />possible..
<br />Flushing Irrigation Lines
<br />a Do not allow fumigant to remain in the irrigation system after the application is complete.
<br />After application of the fumigant, flush the injection.and irrigation system with untreated
<br />water. The flush time must be adequate to purge the fumigant from the injection and
<br />irrigation system, but should be less than the amount that could over -saturate the beds. if
<br />common lines are used for both the fumigant application aril the water treatment/seat (if
<br />applied), these lines must be adequately flushed before starting the water treatment/seal.
<br />Application and Equipment Directions
<br />Anti -siphon and back-flow prevention devices must be installed and in working order.
<br />• Tanks must be in good condition to ensure product does not spill or leak.
<br />• Tanks must have sealable covers on access ports:
<br />• Tanks must have proper pesticide, labels affixed to them.
<br />•
<br />All tanks, hoses, fittings, valves and connections must be serviceable, tightened, sealed
<br />and not leaking:
<br />• Use only tanks, hoses and fittings, designed to withstand the pressure of the system and
<br />resistant tometam.
<br />• Use only positive displacement pumps. Do NOT use impellors made of brass, aluminum, or
<br />galvanized material.
<br />• For undiluted product, aluminum, brass, copper, galvanized Iron, and zinc materials cannot
<br />be used.
<br />• The system must contain a functional check valve, vacuum relief valve, inspection port,
<br />and low-pressure drain apptopriately located on the irrigation pipeline to prevent water
<br />source contamination from backflow.
<br />• The pesticide injection pipeline must contain a functional; automatic, quick -closing check
<br />valve to preventthe flow of fluid toward the injection pump.
<br />Ttfa pesticide injection pipeline must also contain a functional, normally closed, solenoid -
<br />operated valve located on the intake side of the Injection pump and connected to the
<br />system tnterfock t0 prevent fluid from being withdrawn from the supply tank when the
<br />irrigation system Is either automatically or manually shut down,
<br />• The system must contain functional interlocking controls to automatically shut off the
<br />pesticide injection pump when the water pump motor stops.
<br />• The irrigation line or water pump must include a functional pressure switch that will stop
<br />the wafer pump motor when the water pressure decreases to the point'where pesticide
<br />distdbugon is adversely affected.
<br />• systems must use a metering pump such as a positive displacement Injection pump (e.g.,
<br />diaphragm pump) effectively designed and constructed of materials that. are compatible
<br />with pesticides and capable of being fitted with a system interlock.
<br />Solid Set Sprinkler Applications
<br />Wind Speed
<br />• Wind sppeed at the application site must be a minimum of 2 mph at the start of the
<br />appticatfon or forecasted to reach 5 mph during the application and the maximum wind
<br />speed is 10 mph.
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