# 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 t~klo. 
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~ th~se·spet"',- ::·ln~tL.,;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 ingl~5. 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~ ,C~n~an':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.c~bed v,hen uled irt accorcJci.v:e with the 
directions for U!t!', su~iecfl'to th; ri~i 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 in~ir.rl.damages. 
Am?rica,n Cyananti~:C~nlJtan..)' 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 Sl~g~ form~tion 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 hei~t of 6.fee" • .-d a swath width of 
•• • • • •• 50 feet. Do-n~ mo.Jcie ~pplt:otiotJ w~e"'¥1nds exceed 
5 mph. • •• :.. :-:. • •• 
Mist blowers and boom sprayers utilizing a controlled 
air flow to facili'te! part~le sile ~nd :pr~; deposition 
•• ••• ••• •• • may be used at a; v~i~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 rfJi~rCtjn~t 
"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, pea~s, ~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 "1d~ltuiioes. :R~oeat ~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 
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• • • • • • • . . o. 
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• • • • • • , , . .. • , • , , 
t t, 0 
· • • • .. ... • • • ,. • GO 
• .. .. • • .. • lA~de :and • .. · • ... .. <0 ~~(. PIliRted in U.S,A. 
, ... • · · • • • , · · • • • ... 
• • • • • • • • • • • • • • 
· .. ... · .. .. •• .. • • •• .. · .. · • · • • • • • • • • • • • • • .. • · • 0 • • • • • " • • • • • • • • ... .. • .. .. " .. .. " .. ... " .... 
14 15 
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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 
1. 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. 
2. Minimum no-load nozzle speed of 10,500 RPM. 
3. 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. 
4. 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 Pro~E~~res :: "~; '. r .. "" 
6. 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.t~ic ... C;:T...p.~ny "~ 
n Registered TrademHr,<:of:f. ~ dUPq)1t oe ~e~our~ ~ Co .. Inc. 
17

7. Entire system, including tonk, pump, nozzle and 
feed lines, to be used only for application of 
CYTHION or MALATHION ULV. 
8. Entire system must be inspected daily to insure 1hat 
there are no leaks. 
9. Sleeve must be removed and cleaned immediately 
after each use by washing with hot water and 
blowing dry from outside in with clean air. 
10. 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. 
11. Dosage of CYTHION or MALATHION ULV does not 
exceed 3 fluid ounces per acre. 
12. 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 
1. The mass median diameter (MMD) of the droplefs 
should not exceed 17 microns. The MMD is the 
drop diar;leter ... ·.hich -i::v~de,s .tSe sprcy volume into 
two eq,?:al~~parts,;: i.e. 59% o~: the vi?hJJne is, in the 
drop size •• be1c,w t~e I\\MD (md .50%" :'5 above the 
MMD. ,. It'' ~ -' _. I:"~ I:"~ ,,'" 
2. Spray droplets should not exceed 32 microns in size. 
Three percent of the spray droplets (6 droplets out of 
200) can e~ce~d 3~ micrpnf proy,idJr:'.9, the MMD 
does not exree,d 17 O'Iicro..-..s CI./Od n~ drop~ets exceed 
a maximum,dt:48, m;cr'6ni=~ ',"o.~g·e.r dro~lets, 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 
:dam~~Et aut0l"0.bilf ~int unless all the 
.«mdltIO«S ede(.4(.befl. and recommended 
:in:.t~s {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 ins~re on ade· 
quote sample.. .~tore .shdes .. n a ,fight !hd:1 box for 
transfer to a lotcat~n '1;'1er~ m~asure'<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 ne~esso}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 determ~e: the I$ss If,edion:Diantetetr (MMO), the 
accumulatiU peltCenktges irolT9tha.lastuo'umn in Tobie 
1 are plott~d ~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.m~st 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