crop-chem-docs/corpus/epa_ppls/241-110.md

MALATHION ULV CONCENTRATE INSECTICIDE

• EPA Reg No: 241-110
• Registrant: BASF AGRICULTURAL SOLUTIONS US LLC
• Signal word: Caution
• Active ingredients: Malathion (NO INERT USE) (95%)
• Label accepted: 1976-06-11
• Source PDF: https://www3.epa.gov/pesticides/chem_search/ppls/000241-00110-19760611.pdf

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<I/- II () 0-11-197(" ACCEPTED « JUN 11 1976 Unu.·;r ~ Federal tklo. Fungu.i,de. ono Eodentleld. Ad, ~ d~, L'. :9 reqiateIed under -/I OK EPA No. - l-\D .J 1 CYANAMID IMPORTA-,"T Before Using 5 TOP Read Directions in This Leaflet Undiluted spray drople;; of CY· THION" Insecticide, 'The ?remium Grade Malathion" or M,A1.';THIO" ULY* Concentrate Insecticide wi II permallently. da P<le. =i1>m"bi:e '"'. . . .. ... . ~ . .. ........ ,. Paint lHv.es thse·spet"',- ::·lntL.,;c· I .. • ..... ,j .. ... . . .. \ tions for ground and aerio l appli· cation are f~lIoYfed.' ~ .. 8 ... ... . .. • L .. ....... .. . --------:-:-: -:-:----:-:-!------.-- • • • • .. .. " .. I •

.",.: Contents Of This Leaflet Apply To Both: CYTHIOj "TMI! !'flEMIUM GRADE MAUTHION 4I EPA Reg. No. 241·208·AA MAlATHION ULV* CONCENTRATE Insecticide EPA Reg. No. 241-11 O-AA ""Trademark Active Ingredient: Malathion** 95.0% Inert Ingredients ...... 5.0% **0, O-dimethyl phosphorodithioate of diethyl mercaplosuccinate (One gallon contains 9.7 pounds of malathion) Al USUARIO; 5i usled no lee ingl5. no use esle produdo hasta que 10 etiqueta Ie haya sido explicada ampliamente. (TO THE USER: If you cannot read English, do Mt use this product until the label has been fully ex­ plained to you) Before using, read the directions contained in this leaflet for the proper methods and procedures which must be . followed to achieve effective insect control and avoid· permanent damage to automobile and other paint finishes. CAUTION! KEEP OUT OF REACH OF CHILDREN HARMfUL BY SWALLOWING, , ( , , (' . INHHA T1c.lN OR SK,IN CaNT ACT " '. ". ( 'Avoid; Br:dthing ,,yC Mist Avoid Contact With Skin • ( t W<lsh Thor?Ughl:, Afhlr ijandling 1 • c.:l',Jng ,Cnan':hat. tlothing l' <'" " •• Do Not Ct.ntum;nafe voed t)r eed Products , (, " , ( ( .. 2 r j • This product i. taxic to fi.h. Keep out of lakes, streams, pond. tidal marshes and estuarle.. Do not apply were runoff ia likely to occur. Do not apply when weather conditiona favor drift from areas treated. Do not contami­ nate water by cleaning of equipment, or disposal of wastes. Shrimp and crab may be killed at application rates re­ commended on this label. Do not apply where these are important reaourc«. Apply this product only as specified on this label • In cose of on emergency endangering life or property involving this product, call collect, day or night, Area Code 201-835-3100 American Cyanamid Company Agricultural Oivision P. O. Box 400 Princeton, New Jeney 08540 DISCLAIMER The label instructions for the use of this product refled the opinion of experts based on field use and tests. The directions are believed to be reliable and should 'be followed carefully. However, it is impossible to eliminate all risks inherently associated with use of this product. Crop injuury, automobile point damage, ineffectiveness or other unintended consequences may result because of such factors as weather conditions, presence of other materials, Or the manner of use or application all of which are beyond the control of American Cyanamid Company. All such risks shall be assumed by the user. American Cyanamid Company warrants only that the material contained herein conforms to the chemical description on .he lo.el ard- tis .. lfCtSonabt, fit for the use therein d.cbed v,hen uled irt accorcJci.v:e with the directions for U!t!', suiecfl'to th; rii r@fer~~ to above. Any damage. ~is. from ; bre .. ch of .t6.IS warranty shall be limited to direct damages and shall not include consequential commercial damages such as loss of pro­ fits or values or q{'Iy.other. speciPl,pr inir.rl.damages. Am?rica,n Cyananti:CnlJtan..)' D"nes "t» other express or Implied warrant)', w'ic"'din CW'ly. other ... press or ;mpl;ed wa"anty'<of:FIT~CSS 0' p' ~~ItCtV~TA8Il1TY. 3

'. ,. .. " ~ ... Directions For Use CYTHION or MALATHION ULV may be used for the preparation of malathion insecticides. Before using for this purpose, manufacturers should consult American Cyanamid Company for manufacturing and safe handling instructions. ~ The sale of this product does not include a license under any patent owned by the American Cyanamid Company. Mosquito Control with Thermal Aerosols or Fogs Applied by Ground Equipment IMPORT ANT NOTICE TO BE APPLIED ONLY BY TRAINED ERSONNEL OF PUBLIC HEALTH ORGANIZATIONS, MOSQUITO ABATE. MENT DISTRICTS OR PEST CONTROL OPERATORS. DIRECTIONS FOR USE For control of adult mosquitoes with thermal aerosols or fogs, apply CYTHION or MALATHION ULV at the rate of 6·8 oz. actual/gallon {3.9-S.2 gallons CYTHION or MALATHION UlV in 100 gallons finished solution*l by ground equipment delivering 40 gallons per hour at a vehicle speed of miles per hour to treat a swath width of 300·400 feet. . (, '( ( • • • l' .. • 0There Is ~ reat v,.atIOf'l; in the ch .. m:1 composition of fuel oils whtch may b used' as theM follotvents. These differences may cause sludge and/or affect the solubility of the CYTHION or MALATHtON ULV. For more complete details or( fe'ts'or Slg~ formtion ifnd:solubllity In thermal fog solutit.lns, ....r.Jte AnJer.\c:an Q)tsnardrl Company, P. O. Box 400, Printeton, er.- .terYy OS$O.: : : . .. " . . . . ',' .' • AGRICULTURAL USES Directions For Use For Ultra Low Volume Applications Do not use this product for any usas other than those specified in this leaflet CYTHION or MAlATHIQt.,I UlV is used undiluted in specl· ally designed aircraft or ground equipment capable of applying ultra· low volumes for control of the Insects indicated. Aerial applications are most effective when made at a boom heit of 6.fee" • .-d a swath width of •• • • • •• 50 feet. Do-n mo.Jcie pplt:otiotJ we"'¥1nds exceed 5 mph. • •• :.. :-:. • •• Mist blowers and boom sprayers utilizing a controlled air flow to facili'te! partle sile nd :pr; deposition •• ••• ••• •• • may be used at a; vi~e :peect:of:4 to ~ 0 Mp'h. •••• • ••••• 5

,-. - ,- .-:.;-:: ---.:. - - - : .. -'.

Mist blowers with a pump capable of producing up to 40 psi and blower speeds of 2600 rpm are satisfactory, Use flat fan nozzles. 8001 to 8002, placed 30· into air blast or rotary atomizers into the air blast that produce an efficient spray particle with a mass median diameter of 40 to 100 microns. Swath widths should not exceed 30 feet, and application should not be made when winds exceed 5 mph. Boom sprayers with a filtered rotory air compressor, either PTO or gas engine driven or an air pump capable of producing at least 12 psi are satisfactory. Use air pressure on chemical tanks and an accurate metering valve to assure a calibrated flow of the pesticide. Air should be regulated with relief valve and gauge for proper air and I1q'uid mixture. Pneumatic.type spray nozzles, as suggested by equipment manufacturer, should be used for spray particles with mass median dia­ meter of 30 to 100 microns. Applications should not be made when winds exceed 5 mph. Repeat applications should be made as necessary unless otherwise specified. '" t •• •• t , , , , ... • • • •• .. • • .' • .. ••• • • • • , . , • 6 " f' f, " . • • • . • • • •• • • • • .. ---------~, • • • • • •• • •• • • ... ••• • • • • • • • • • • • • • • •• •• • •• • • • • • • • • • • • • • • • • • • • • • • •• •• • • • • • • • • • • • • • • • • • • •• •

" .. IMPORTANT - Undiluted spray droplets of CYTHION or MAlATHI0t-t UlV will permanently damage automobile paint. If accidental expOsure does occur, the vehicle should be washed immediately. Consult your stote experiment station or state extension service for proper timing of sprays. Crop Pests Controlled ----------------r_--~~~~~~------. Alfalfa Beans (lima, green, snop, Nav'f, red. •• , kidney, ¥.('JX: dry, : blackeye): ' • : · · .. ... · · • • . . '" .. 8 Alfalfa caterpillar Western yellow striped armyworm Alfalfa weevil larvae Beet armyworm Grasshoppers Mexican bean beetle leo{I,opperl\ Gretn clO:V'e~ worm Jupall.ese ,beetle lyg,,'s. ~ugs. • . .. .. • . • . .. • This product is highly toxic to bees exposed to direct treatment or residues on crops. Protective information may be obtained from your Cooperative Agricultural Extension Service. Fluid Ounces Jler Acre 8 12 16 8 16 8 Days to Harvest or Grazing & Comments o day. Apply when larvoe are small 5 days. Apply when larvae are large or when foliage is dense. 5 days. Apply when day temperatures or. expected to exceed 6S'F. and when 50-75% of leaves show feeding damage. o day. Apply when larvae are small. 5 days. Apply when larvae are lorge or when foliage is dense. o day. Do not apply to alfalfa in bloom Do not apply to seed alfalfa • • • •• ••• • 8 • • : day.: • • • • • • • • •• • • • • • •• • •• •• • •• •• • · •• (Continued) • • • • • • ••• • • • • • • • •• .. • ••• .. • • 0 • • • • • 0 o • 0 0 0 0 0 • 0 0 0 .. ... 9

;" .. .",.: (Continued) Crop Blueberri~s ~ Cherries Cereal crops (barley, corn, oats, wheat) and grasses Clover, Pasture and Range Grass, Grass, Grass Hay, Non- agricultural Lands (wastelands, roadsides) Corn Cotton • < • .. • ... .. .. , . -... . •• .. ... • • Pests Controlled Blueberry maggot Cherry fruit fly Cereal leaf beetle Grasshoppers Adult corn rootworm Early Season Insects: Thrips Fleahoppers leafhoppers Boll weevil Grasshoppers • • • • • •• • l'llJus ~l'~s • r, f' C ~ • • . .. .. . • .. 10 ,. ! •

. " Fluid Ounces Per Acre 10 12·16 4·8 8 4 4-8 8-12 16 8 8·12 .. .. .. 16 ." .. .... o day 1 day. Days to Harvest or Grazing & Comments • Apply by aircraft only. Us. higher rate when foliage is heavy or infestation is severe. Make first application as soon as flies appear . Barley, oats, wheat: 7 da)'s. Corn: 5 days. Grasses: o day. o day. Do not apply to clover ;n bloom. 5 days. Early to mid season late season o Doy .. "4" a'l'l _ 'I~ ~~ " . " .. ~ "'ter., he;lY rfJirCtjnt "1lopulatl!Ons. .. .. .. .. .. ... " .... "~: (Continued) 11

.. ,

(Continued)

Crop Pests Controlled

Grain Crops (barley, 1:orn

oats, rye, rice, grain Grasshoppers

sorghum and wheat)

Grain Sorghum ~ Sorghum midge

Peas (Northwest) Pea Weevil

Rice-Grain Form Rice stink bug

(louisiana, Texas)

Safflower Grasshoppers

"lygus bugs

Soybeans Mexican bean beetle

Grasshoppers

Japanese beetle

Green doverworm

Sugar Beets Grasshoppers

Sugar beet root

maggot adults

Nonagricultural Lands Beet leafhopper

(on wild host plants)

Beef Cattle-Feed lots and Adult flies and

Holding Pens Mosquitoes

OTHER AGRICULT1lIIAL USES,

Alfalfa, Cla,(&'rl Posture a1nJi' Range Grf1;s. Gross and

Grass ay, !ql'..1ir:. Cr:,"'ps, peas, ~ice, C"!dmatoes .and

Nonagrlcult ....... al landS! (wnrteland): .Mult mosquitoes

and flies-App~)' CYTH\ON 6r MAl!J(flilON' ULV at the

rate of 2 to .4 fluid ounces for control of adult mosquitoes

and at 6 to 8 fluid ounces per acre for control of adult

flies and "1dltuiioes. :Roeat ppli..lti!-,ns as necessary.

" '"

" .,

12

,

;

, '

..

I

Fluid Ounces

per Acre

8

8-12

8

8

8

8

8

8

6-8

•

Days to Harvest or

Grazing and Commenh

7 days. except corn. Corn: 5 days

7 days. Apply during the bloom stage.

14 days

7 days. Apply by aircraft only. Apply

during early milk and dough stage of

growing rice.

3 days of horvesting seeds.

7 days

o day

7 days. If tops ore to be used for

food or feed.

o day

o day

On alfalfa, clover, ~asture and tq,nge grpss, grass and

grass hay, 1"i~)Io be pliecf:' do," of hmveut or grazing.

Do not apFtY.Jo aJft:llf" ac$d cloler In ~aom. Do not

use on seed alAal6a. On gf'C!'in CfCfpS, ma~ no applica­

tion within ,,]-dals·tf har.J'est 01 forag~·use; on corn,

within 5 days of harvest or forage; on rice, within 7 days

of harvest; on beans and tomotoes, within 1 doy of

harvest. :::::: •• :

•• ••• ••• •• •

: :: :::: • :(Contlnued) ~~ ~~ ..... 13

• (Continued) FOREST INSECTS Apply with aircraft equipped for ultra low volume ap- plication. Make application when air is calm and temperature is below 68"F. Do not allow spray to con- tact ferns, hickory CWd maples as injury may result. Do , not spray on elms under extreme heat, drought and disease conditions. . . Fluid Ounces Tree Pest Controlled per Acre Commenh Douglas Fir 13 Apply when highest percentage of True Fir Spruce budworm larvae are in the fifth inster. Spruce Hemlock Hemlock looper 8 Apply when most larvae ore in third and fourth inster. Apply when larvae are in the first or European pine sawfly second instor or before they reach 1/2 Pines 10 inch in length. 5arotoga spittlebug Apply when 95% hos become adult. of the population 8 Apply in spring as soon as larvae Larch Larch casebearer break hibernation and begin feeding on new foliage. 0

• .. 'j," (t"" ,. , '..1---' ~ • • • • • • • . . o. " . ' • , • • • • • • , , . .. • , • , , t t, 0 · • • • .. ... • • • ,. • GO • .. .. • • .. • lA~de :and • .. · • ... .. <0 ~~(. PIliRted in U.S,A. , ... • · · • • • , · · • • • ... • • • • • • • • • • • • • • · .. ... · .. .. •• .. • • •• .. · .. · • · • • • • • • • • • • • • • .. • · • 0 • • • • • " • • • • • • • • ... .. • .. .. " .. .. " .. ... " .... 14 15 -------,,--.--;.

Ultra Low Volume Aerial Application where automobiles, trailers, trucks and pleasure boats are present IMPORTANT NOTICE TO BE APPLIED ONLY BY TRAINED PERSONNel OF PUBLIC HEALTH ORGANIZATIONS, MOSQUITO ABATE. MENT DISTRICTS OR PEST CONTROL OPERATORS. DIRECTIONS FOR USE ADULT MOSQUITO CONTROL OVER. CITIES, TOWNS, AND OTHER AREAS WHERE AUTOMOBilES, TRAilERS, TRUCKS AND PLEASURE BOATS ARE PRESENT, Apply 2.6 to 3.0 fluid ounce~ of CYTHION or MALATHION UlV per acre. Aerial spraying should not be attempted when the wind is at or above 10 mph or temperatures are above 82°F. IMPORTANT - Undiluted spray droplets of CYTHION or MALATHION Ul V wilt permanently damage vehicle paint finishes unless the aircraft used for the ultro low volume application meets all of the specifications listed below: fiXED WING AIRCRAfT

1. Aircraft is operated at 1 SO mph or more.

2. There are no leaks in 'the ultra low volume spray system.

3. Nozzles, ar~ f'1to.cid .~'\ the poam lit a 45° angle down ond Into the wmd. e •• •• • c • ••

4. iaphtcfg":, :h1 vo,h:es dire IIsfd!Gn all nozzles to Insure l'o.slf1ve wt 0 f.of the.S(lfay .• c

5. Dosage of CYTHION or MALATHION ULV does not exceed 3 fluid ounces per acre. "" '···t 6. The I.proy,slstem I"roduC'es doop '3ts of this product in titt set t~ ~":m6sS: edld'l diameter (MMD) micrf''i la\I/!' 'lfi!" no n:rt: t.~ft 10% of the drop- 16 lets exceeding 100 microns, as determined by read­ ings made from microscope slides coated with DRI-FILM* or TEFlON@. HELICOPTER Equipment Specifications

6. Rotary nozzle equivalent to Beecomist Spray Head Assembly Model No. 350 equipped with: a. a direct reading RPM tachometer or low RPM signal light readily visable to operator; b. a stainless steel porous metal sleeve, 20 micron pore size, dynamically balanced to the nozzle; c. a diaphragm check valve as near to the rotary nozzle as possible to insure positive cut off of the spray; d. nozzle on-off switch separate from main switch and pump switch.

7. Minimum no-load nozzle speed of 10,500 RPM.

8. A cOntinuous nonpulsating metered flow must be maintained by a variable speed metering pump equipped with: a. a positive cut off valve between tank and pump; b. a flow guage or tachometer visible to operator; c. a pump on-off switch separate from main switch and nozzle switch.

9. Maximum flow rate of 0.5 gallon per minute per nozzle. S. Rotary nozzle must be mounted behind and below the boom with the sleeve directed toward the rear of the aircraft and parallel to the ground during flight. Nozzle must be positioned to minimize air turbulence and the collection of CYTHION or MALA­ THION UlV droplets on mounting brackets, feed lines, fillings, etc., or any part of the aircraft. Operating ProE~~res :: "; '. r .. ""

10. CYTHION··U"·:MAt.ATHIOh~ ULV~:mu]t be. "prefiltered through q. 1,0 rrfiCfC?n filte~:prioUo tror:'.s.er into heli­ copter tonk. A" 50 mesh stainless steel line strainer must be installed in the pump feed line. r,,, " Co ,. ~ Trademark of Gem?r-:d: Eler.tic ... C;:T...p.ny " n Registered TrademHr,<:of:f. ~ dUPq)1t oe eour ~ Co .. Inc. 17

11. Entire system, including tonk, pump, nozzle and feed lines, to be used only for application of CYTHION or MALATHION ULV.

12. Entire system must be inspected daily to insure 1hat there are no leaks.

13. Sleeve must be removed and cleaned immediately after each use by washing with hot water and blowing dry from outside in with clean air.

14. Rotating nozzle""" must be turned on and operating before turning on pump. For shut off. pump must be shut off and lines cleared prior to stopping noz· Ie rotation.

15. Dosage of CYTHION or MALATHION ULV does not exceed 3 fluid ounces per acre.

16. The spray system must produce droplets of CYTHION or MALATHION ULV with a mass median diameter (MMD) of less than 50 microns, with no more than 2.5% of the droplets exceeding 100 microns. as determined by readings made from microscope slides coo ted with DRI·FILM or TEFLON. -• .. . ... • • • • • • • · • • • • • • • • • • .. •• .. • • .. ... .. ... • • • • • • • • • .. ... .. .. .. • • • • • • • • • • • • • • • • ... .. ... .. 18 Ultra Low Volume Application NONTHERMAL AEROSOLS Applied by GROUND EQUIPMENT IMPORTANT NOTICE • TO BE APPLIED ONLY BY TRAINED PERSONNEl OF PUBLIC HEALTH ORGANIZATIONS, MOSQUITO ABATE· MENT DISTRICTS OR PEST CONTROL OPERATORS. DIRECTIONS FOR USE Adult Mosquito Control - For control of adult mosquitoes over a 300·foot swath with nonthermal aerosols of CYTHION or MALATHION ULV using the ultra low volume method, use the folloWing rates at the indicated vehicle speeds: Vehicle Speed Flaw Rate of &YT.JUON or MALATHION ULV Maximum Fig. Miles per Kour Fluid OllCes per Minllte Rate per HOir 5 1.0 to 2.1 fluid ounces 1 gallon 10 2.0 to 4.3 fluid ounces 2 gallons Adult Stable Fly Control- For control of adult stable flies over a 300·foot swath with nonthermol aerosols of CYTHION or MALATHION ULV using the ultra low volume method, use the following flaw rates at the indicated vehicle speeds: Vehicle Speed Miles per Multi' 5 10 Flaw Rate of &YTKION Of MALATHION ULY Fluid Oances per Minute 2.1 fluid ounces 4.3 fluid ounces DROPLET SIZE Muimllm Fill .. Rate per KOlr 1 gallon 2 gallons

17. The mass median diameter (MMD) of the droplefs should not exceed 17 microns. The MMD is the drop diar;leter ... ·.hich -i::vde,s .tSe sprcy volume into two eq,?:al~~parts,;: i.e. 59% o: the vi?hJJne is, in the drop size •• be1c,w te I\MD (md .50%" :'5 above the MMD. ,. It'' ~ -' _. I:" I:"~ ,,'"

18. Spray droplets should not exceed 32 microns in size. Three percent of the spray droplets (6 droplets out of

200. can eced 3~ micrpnf proy,idJr:'.9, the MMD does not exree,d 17 O'Iicro..-..s CI./Od n~ dropets exceed a maximum,dt:48, m;cr'6ni= ',"o.g·e.r drolets, when transported" ~y 'n,a.;'ural-:· ~r "c,uyre..n!!l1 impinge 19

more readily on objects in their pathway and will permanently damage automobile-type paints. 3. More than one-half of the total spray mass must consist of droplets in the 6 to 18 micron range to achieve adequate dispersal of insecticide over 0 300-foot swath. 4. A minimum of two-thirds, preferably four-fifths of the total spray mass must consis.t of droplets not exceeding 24 microns in range. ~ OPERATING EQUIPMENT Each Nonthermal Aerosol Generator used for dispersal of CYTHION or MALATHION ULV to control adult mos­ quitoes must have minimum capability of producing the droplet spectrum described under DROPLET SIZE. The initial determination of droplet size is made after the unit is installed in a vehicle and prior to its use in mos­ quito control operations. The unit should be rechecked as frequently as necessary to insure that proper droplet size is maintained for each operation. Determination of droplet size every two months is usually suffiCient if the unit has been mainta:ned in good opero'ting condition. EqUipment manufacturer's instructions setting forth clean­ ing and maintenance of the unit must be followed. The unit must be inspected before each operation to correct any leaks or obstructions in the spray system; to detect whether the nozzle, hoses, or other ports are worn and need replacement; to insure that the flow meter is properly calibrated; and to determine that the pressure recommended by the manufacturer is being maintained. Flow Rate - must be regulated by accurate flow meter. not greater than 1 gallon per hour at 5 mph or 2 gallons per hour at 10 mph. Nozzle Direction - rear of the vehicle. ..,., upword at an angle of 45° or more. Vehicle SP"'1l. - nAC rehj/l- tho 10 'l's per hour. • • - shlfl off ra uip",eM when vehicle • • • is. :top. '.: • • • • • •• • • • IMPORTANT - ... • .. • ... Spray droplets of undiluted CYTHION or MALATHION ULV will permanently :damEt aut0l"0.bilf int unless all the .«mdltIO«S ede(.4(.befl. and recommended :in:.ts {eafleC ate )n~. • • • • • • • 20 Directions for Determining the droplet size of CYTHION or MALATHION ULV nonthermal aerosols • Permanent records of each droplet size determination must be kept and made available to American Cyanamid upon req uest. I. Preparation of Slides with DRleFILM CYTHION OR MALATHION ULV droplet sizes are deter. mined by depositing a sample of the aerosol on a coated gloss slide and measuring the droplets under a high. power microscope. Ordinary 3" xl" gloss slides may be cooted with silicone (General Electric SC-87 DRI-FILM) prior to sampling to prevent excessive spreading or coale­ scence of the droplets. The slides are dipped into a 10 percent so-:ulion of DRI·FILM in toluene, drained and dried at about 200"F. for 30 minutes, ofter which they are dipped in acetone, allowed to dry and stored in a tight slide box. Cooting solution must be freshly pre­ pared. 00 not store coating solution because it wi1\ deteriorate. Slides are lightly polished with a soft tissue before using to remove any foreign particles. II. Deposition of CYTHION OR MALATHION ULV Droplets on Slides Droplets should be collected under ideal operating con­ ditions to insure representative sampling of droplets in the aerosol. A sample of the CYTHION or MALATHION ULV aerosol is deposited on a slide by waving the slide as rapidly as possible perpendicular through the aerosol cloud at a distance of 25 feet from the point of discharge. The slide velOCity may be increased by attaching it to a 3 or 4 foot stick by means of a spring paper clip. At least two slides. should. e ~p'os: Ito insre on ade· quote sample.. .tore .shdes .. n a ,fight !hd:1 box for transfer to a lotcatn '1;'1er~ masure'<men}s co, be mode. Avoid excessive ,.hellt during< '.ron..;ii and ':ore in c cool place untirmeas\SUmenls tan be made.' Although label specifications require the aerosol non Ie to be angled upwo[d .. at 45. 0 or -:,",o,e dU{,inr, ,[,peration, it is more convenioot'lto pCGition. th,r" nozde purallel to the ground for dropfe'f sqrhpling:, 'I thi}s nc;t.:possible it .will be neesso}y, :IO'? posdi,ohed <~t .p't lufficient height to oblom a representative sample of the aerosol. 21

III. Determination of CYTHION or MALATHION ULV Droplet Sizes A microscope with mechanical stage and an eyepiece micrometer are used to determine the size of the indivi­ dual aerosol droplets. Prior to taking measurements, the divisions of the eyepiece micrometer must be calibrated into microns by means of a stage micrometer. In the example represented in Table 1, droplets were measured at 400x magnification. At that magnification each division of the eyepiece was calibrated to equal 3.5 microns. At least 200 droplets should be measured. Usually this is easily accomplished on one slide. An accurate method is to measure all droplets that pass through the micro­ meter scale as the slide is moved from one edge to the other by using the mechanical stage. Measurements should nat be taken along the margins of the slide. It is more convenient to measure in terms of the divisions of the eyepiece micrc.:neter and then convert these divi­ sions into microns. The measurements converted into microns must then be corrected for the amount of spread that occurred on the slides. The CYTHION or MALATHION ULV spread factor for silicone-coated slides is 0.5. Therefore, in, Table 1 each division of the eyepiece odually equals 1.75 mic­ rons (3.5 microns times the 0.5 spread factor). lhe spread factor for TEflON-coated slides is 0.69. The following procedure as given for silicone-coated slides, would be the same for TEflON-coated slides once the value for each eyepiece division has been determined. The measurements are tabulated and processed as in Tobie 1. The Maximum Diameter is calculated by con­ verting the diameter of the largest droplet measured into microns. In Table 1, the lorgest droplet measured had a diameter of 19 eyepiece divisions. Therefore, the Maxi· mum Diameter is 33.3 microns (19 x 1.75 = 33.3), • ••• ••• • • To determe: the I$ss If,edion:Diantetetr (MMO), the accumulatiU peltCenktges irolT9tha.lastuo'umn in Tobie 1 are plottd ~gaintCthe·epiec ptvis'f'\S (0) on arith· methic probability paper as in Figure 1. Directly across from the 50 percent point on the line is the median drop­ let size i",,p,ece cijviiions ¥"hich.mst be converted to microns .• \n F.ure.(, ".2 e:epieoe civisions times 'the conversioZ,. foc"'·, .ot!, ~5· e<WoJs . Vtass Median Dia- meter of '\1 ~lldorfs. • : •• : •• 22 •

'" If 15 iii 5 14 ~ ~lJ ~ ~ 12 1111 Z 2 10 '" ~ , o " . '" z Q 7 '" :; Ci • '" hl 5 ii: '" . ~ • 2 • figure 1. Percentage of the total volume of aerosol samples be­ low each stated droplet size (from Table 1). The Mass Median Diameter 'is determined from the 50 percent point on the line. The Mass Median Diameter (MMD) = 9.2 divisions times 1.75 = 16.1 microns. I ill Ilffi! I ~ ~ II II F -1= , . '",',." I ,., I I m I I.Ot = , : 1 ACCUMULATIVE PERCENT;·E • • • •• •• • • • • • , • • • • , , , .. • 23 • ." , -. - .--- • .:: . .... ~ .. • • • • • • • • • • • · . · . 24 ','

-', -- _., .',,,. . '." -'ill" ;'--' liiiA&;, 5 Table 1. - Representative Count of CYTHION or MALATHION ULV Concentrate Aerosol Droplets Impinged on Microscope Slides Coated with DRI-FILM. EyeplKI "Imber of % If lltal Aceamolatin DiYisius Droplets DXN DXN (0)' 00 • (1)XN) Permtages • 5 5 0,31 0,31 2 10 20 1.22 1.53 3 9 27 1.65 3,18 4 12 48 2,93 6,11 5 15 75 4.58 10.69 6 12 72 4.40 15.09 7 25 175 10.70 25.79 8 14 112 6.85 32.64 9 28 252 15.40 48.04 10 19 190 11.61 59.65 11 14 154 9.41 65.06 12 10 120 7.33 76.39 13 6 78 4.77 81.16 14 4 56 3.42 84.58 15 11 165 10.09 94.67 16 2 32 1.96 96.63 18 2 36 c 2.20 98.83 19 (. (,19 , (!f.16!' 99.99 'T6li6 ' , , Total 199 6 , , • • , •• .. .. ••• 0 • ·Measurements were taken at 400x mag.ification. Each eyepiece lIiyision eqllals 1.1~ microns (3.5 mlcrons:timts the 1.5 sprefllJctor).: t" C. • ••• •• , • ( . . . ~ ~ . . . • t •• 25 ~ . . ( • • • t. " • , Also for use in accordance with the recommenda. tions and instructions issued by the United Stotes Department of Agriculture for quarantine programs. To be used only by or under the direction of Federal/Slale personnel for quarantine treatments. " , • . , ..... t ( •• , . • • , . . • • • •• • •• · .. _--- ·11~;r~THlo. N ULV' I • CO~~~eEc~~~~TE I l! _-!- ____ . ______ -.-----J .. • • • • . . .j