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1977 Control Series 4

Insect Control Recommendations EXTENSION DIVISION

Virginia Polytechnic Institute and Suite University,

CONTROL INSECTS OF CORN, SMALL GRAIN, AND GRAIN SORGHUM

J. E. Roberts, Sr., Extension Specialist, Entomology

Pests

Root worms

Insecticide and

Formulation

Carbof uran (Furadan) 4F 4 lb. /gal.

V.P.I. & S.U. LIBRARY

AUG 2 8 18m

bLACK~bUtiG~ VlEGINIA

Root worms Seed corn maggot aid in reduction of wireworms

Dasanit 15G

Disulfoton (Di-Syston) 15% G

Dyfonate 10% G

Terbufos (Counter) 15 G.

Banded or in-furrow applications will control seed corn maggots. In addition in-furrow applications will aid in the reduction of corn wireworms.

Rate Per Acre and Remarks and Precautions

CORN ONLY

Daya Between Last Application and Harvest

Apply 1-1/2 to 2 pt. of 0 days Furadan 4F per acre. APPLY ONLY ONCE PER SEASON. Apply as 7" band over the row by mixing with water or liquid fertilizer. When Furadan 4F is used with liquid fertilizers, mix in the following way, making certain that the mixture is physically compatible: Premix 1 part Furadan 4F with 2 parts of water. Add this premix to the tank of fertilizer along with rinsings from the premixing container. Maintain agitation in the tank after mixing and during application. Do not mix until ready to use.

Apply preplant 6.7 lL. Place granules in a 7" band 0ver the row directly behind the planter shoe in front of the press wheel. Or, place directly in the seed furrow behind the planter shoe.

Apply 6.7 lb. of 15% G. Band on each side of the seed furrow at planting time. Do not apply more than twice per season. Do not allow granules to contact seed.

Apply preplant 10 lb. Incorp0rate into top 1/2 to 1 inch of soil in an 8" band as a row applica-tion.

Apply preplant 6.5 lb. per acre. Place granules in a 7" band over the row directly behind the planter shoe in front of the press wheel. Or, place directly in the seed furrow behind the planter shoe.

Do not place bands closer than 6". There is a 40 day waiting period.

Apply at planting time. Do not apply within 40 days of harvesting for food, feed, or ensilage.

When using Dyfonate, do not feed or graze live-stock within 45 days of treatment.

luuad In furtherance of Cooperative Extension work, Acta of May 8 and June 30, 1914, In cooperation with the U.S. Department of Agriculture. W. E. Skelton, Dean, Extension Division, Cooperative Extension Service, Virginia Polytechnic I nstituta and State University, Blacksburg, Virginia 24061.

The Virginia Cooperative Extension Service by iaw and purpose is dedicated to serve all people on an equal and nondiscriminatory basis. An Equal Opportunity/Affirmative Action Employer

5

Pests

Rootworms

Armyworms

Japanese beetles

Wireworms

Cutworms

1st Generation European corn borers, wireworms

Insecticide and

Formulation

Phorate (Thimet) 15%G

-2-

Rate Per Acre and Remarks and Precautions

Apply preplant 6-1/2 lb. of 15% G but not in direct contact with seed.

Days Between Last Application and Harvest

30 days

----------------------------------------------------------------------------------Diazinon 14G (Poat emergence basal treatment).

Carbary! (Sevin) 50% WP or 80% WP

Carbary!

Diazinon 14G (Broadcast Preplant)

Diazinon

Carbof uran (Furadan) 10% G

4-1/2 to 8-1/2 oz. per 1,000 linear: feet or row: Apply amount per acre in accordance with label for basal treatment.

10 days for grazing dairy cattle, or beef cattle or sheep. 0 days for grain

Do not feed treated fodder to dairy or beef cattle or sheep for ten days following application. Temporary spotting of foliage sometimes occurs following application.

Apply 2 to 4 lb. of 50% WP or 1-1/4 to 2-1/2 lb. of 80% WP. Apply broadcast at the rate of 25-30 gal. water at 40-60 psi when an average of 1 or more small worms per row ft. are found.

Apply 2 to 4 lb. of 50% WP or 1-1/4 to 2-1/2 lb. of 80% WP. Use only to prevent adult beetles from chewinb fresh silks from corn thereby preventing pollination. Treating of frequently sufficient.

21-28 lbs. 8roadc.<l.St•before planting and work into soil 4 to 6 inches.

Apply 2 lb. actual (4 lb. of 50% WP or 1/2 gal. of AG). Use when plants are 3-12" high. Spray

Application to tassel region during pollen shedding period will reduce bee population. 0 days.

Application to tassel region during pollen shedding period will reduce bee population. 0 days

field margins is

10 days for grazing dairy cattle, or beef cattle or sheep. 0 days for grain.

10 days forage

lower portions of corn plant and soil around base of plants.

Apply 20-30 lb. for control. Apply in 7" band or in seed furrow at planting time. Application of even the planting is not likely to give 2nd generation borer control. once per season.

higher rate at satisfactory Apply only

Pests

European corn borer

Fall .Armyworms

Armyworms

Armyworms & cutworms

Insecticide and

Formulat lon

Carbofuran (Furadan) 10% G

-3-

Rate Per Acre and Remark3 and Precautions

Apply 10 lb. of 10% G. Apply broadcast over the foliage. Apply when eggs begin to

Daya Between Last Applicatioa and Harvest

0 days

hatch or within 2 weeks pd.or to tassel:Ulg. Do not make a foliar application if Furadan 10 granules were applied at more than 10 lb. per acre at planting. Do not make more than 2

~--------------------------!~!!!!_!!!!E~!~E!-~!!_!!!!~~~-----~------------------Diazinon 14G 7 to 14 lbs. 10 days for grazing (Broadcast over Apply over the corn dairy cattle, or the whorl). so granules fall into beef cattle or sheep.

the whorl. For 0 days for grain. European corn borer when 75% of plants show first-generation borer feeding, make 2nd application 7 days later if needed. To control 2nd generation corn borers, apply 7-14 lbs. per acre, as above, when field ~~~!_!~~~!_!QQ_!S~-~!!!! per 100 plants. Apply as above for European corn borer when fall armyworms first appear.

CORN AND SMALL GRAINS (BARLEY, OATS, WHEAT AND RYE)

Methyl Parathion Parathion 4 lb./gal. or 8 lb./gal EC

Apply l pt. of 4 lb./gal. EC or 1/2 pt. or 8 lb./gal EC on s~all grain. Apply 1/2 pt. of° 4 lb./gal. EC or 1/4 pt. of 8 lb./gal. EC on corn.

12 days grain or forage for corn 15 days for barley, oats, wheat, and rye

This is extremely poisonous. Use extreme precautions in handling and applying. If you become ill while using this insecticide, call a physician i111111ediately. Ethyl parathion is not registered for rye. Workers entering fields within 48 hours should wear

____________________________ £!~!!~!!!!_~!~!~!~s~---------------------------------Ma1athion 57% EC Apply 1-1/2 - 2 pt. 5 days corn-harvest

Three to five armyworms per square ft. more than 1/2" long indicates a need for treatment.

Trichlorfon (Dylox) 80% SP

This is a safe chemical 7 days all others -for aerial applicators grain or forage to use near residential areas.

Apply 10-20 oz. Do not use on rye. Apply when plants are 3-12" high. Spray lower portions of corn plant and soil around base.

21 d°8ys small grd·~. Limit to 3 applicatio~s per season. Applicatioun can be ma<le without removing livestock except for corn.

-----------·--------~-

l'ests

Aphids (Green bugs) (Wheat only)

Aphids (for Barley and Oats only)

Aphids (not on rye)

Aphids (not on corn)

Insecticide and

Formulation

Dimethoate (Cygon) 2.67 lbs. per gallon

Disulfoton (Di-Syston) 65% LC

Disulfoton (Di-Sys ton) 65% LC

Disulfoton (Di-Sys ton) 15% G

Demeton (Systox) 2 (25% EC) or Systox 6 (66% EC)

-4-

Rate Per Acre and Remarks and Precautions

3/4 to 1 pint

1/3 to 1 pint per acre For application hy air-

_ craft or ground <'quipment: Apply specified dosagte per acre in sufficient water to obtain thorough

Days lletween Last App ii.can.on and Harvest

60 days Harvest Do not apply within 14 days of grazing plant.

coverage but not less than 1 gallon total volumf' per acre. Use the lower rates on plants up to tillering (stooling). Higher rates should he used after plants begin to tiller. For application in liquid fertilizer. Mix l/2 to 1 pint of DI-SYSTON Liquid Concentrate in the amount of liquid fertilizer to be app 1 il-d per acre. Apply this mixture as a top dressing with suitable ground equipment. Fall Applications: Two applications may he made in the fall. Allow 30 days between applt<ationb. Spring Applications: Application at green-up may be made following "fall applications." A second application may be made 30 days follc•wing the first spring application. Do not make ~ applications within 30 days of grain harvest.

NOTE Do not graze treated fields after .!!!i'.. application nt DI-SYSTON Liquid Concentrate.

Apply 1.3 pints of the 60 days grain liquid concentrate in 30 days precutting water to cover but not Or pregrazing less than 1 gal. total

volume 12r acre. May be applied in liquid fertilizer. injection in water emulsion or fertilizer at planting time.

Apply as soil with liquid

Apply 6.7 lb. per acre. Apply by drilling or broadcast at planting time or as a broadcast after emergence. ~

30 days precutting or pregrazing 60 days grain

at planting time only for wheat. Do not apply more than twice per season (once per season for wheat). Allow a minimum of 21 days, between applications for barley and oats.

Apply 1/2 to 1 pt. per acre of Systox 2 or 1/6 to 1/3 pt. per acre of Systox b. Foliar applications only. Do not apply more than twice per season. Do not repeat application within 14 days.

45 days grain Do not graze treated fields or harvest for forage.

Pests

(Green bugs and/or English grain aphid)

Insecticide and

Formulation

Malathion (Cythion) 57% EC

-5-

Rate Per Acre and Remarks and Precautions

1-1/2 pt. per acre in water to cover. PHOSPHATE INSECTICIDES SHOULD BE APPLIED AT TEMPERATUR~: APPROACHINt: 700 TO BE MOST EFFEC-

Days Between Last Applicatlon and Harvest

7 days grain 5 days corn

----------------------------!!~!::.: _______ ----- -------·--·----------------·-------· .. --.. Parathion 4 lb./gal or 8 lb./gal EC

1/2 pt. or 4 lb./gal EC or 1/4 pt. 8 lb./ gal. EC.

Workers entering fields within 48 hours should wear protective clothing.

GUIDELINES ON WHEN TO TREAT SMALL GRAINS FOR APHID CONTROL

15 days small grain 12 days corn Not registered for r)1~

Insecticide need depends on the number of greenbugs present, size and vigor of plants, time of year, moisture conditions, stage of growth and presence or absence of parasites and predators. Informatio11 on the following table will serve as a reliable guide in determining the need for treatment in small grains.

Plant height (inches) 3-6

Number greenbugs per linear foot

-- 100-3~--··

4-8 200-400 6-16 300-800

The appearance of small yellow or brown areas caused by greenbug feeding indicates a need for treatment. Occasionally populations of 25 to 50 greenbugs per linear foot of row on young small grain plants may warrant treatment. This is especially true on oats or barley. Oats and barley commonly are more susceptible to greenbug damage than wheat.

Pests

Cereal leaf beetle

(not on rye)

Insecticide and

Formulation

Azinphosmethyl (Guthion) 22% EC

·--------------------· Rate Per Acre and Remarks and Precautions

Apply 1-1/2 - 2 pt. Apply specified dosage per acre by air or ground equipment in sufficient water for complete coverage but not less than 1 gal.

Days Between Last Application and Harvest

30 days food, feed, forage or grazing. Do not apply more than once per season.

----------------------------2!!_!~!!.: ___________ ··----------·--·· -----Malathion 577. EC Apply 1 - i-1/2 pt. of 7 d«ys grain or fordgt: (Cythion) 57% Malathion EC.

Apply specified dosage per acre by air or ground equipment in sufficient water for complete coverage but not less than 1 gal. per acre.

-6-

--------------·-- ·-----·--··---

Pests

Corn earworm

insecticide and

r·ormulation

Rate Per Acre and Remarks and Precautions

GRAIN SORGHUM

Apply 2 - ~ lh. of

Days Bet1ocen L:ist Appiic,-,ri••" and Hrlrvest

and fall armyworm (feeding in whorls)

Carbary! (Sevin) 50% WP or 80% WP 50% WP or 1-!/!

2-1/2 lb. uf 80/~ WI:'. Apply control measure:.. when J or more worms per plant ar,, found

21 days grain 0 day8 1oragc

in whorls. ----------·--·---· -- -----· Corn earworm, fall armyworm, and sorghum webworm (feeding on heads)

Apply control measures when 4 or mor•' worms per row ft. are found in the hea,ds.

-----·-----·-

AC - Indicates the proper EC for-..lation for agricultural uses; Al - Active Ingredient; Al/Cal. - Active Ingredient per Gallon; D - Dust; E - Unulsifiable; EC - Emulsiftable Concf:'ntrate; EL - Emulsifiable Ltquld; P - FlolWable; fl. oz. - fluid ouace; G - Granular; gal. - gallon; gal/100 - gallon per 100; in. - inch; IU - International Unit; lb. - poundi lb./gal. - pound• per gallon; LC - Liquid Conce:r:tratej liq. aol. - liquid solution~ LS - Liq•lid Solution or Suspension; MC - Hillittram; oz. - ounce; pt. - ;>int; qta. - quarts; S - Soluble or Spr.iyable; SC - Soluble Concentrate; SP - Sprayable or Soluble Powo:h·r; sq. ft. - square ft.; thsp. - tabJea;pooo; ts?. - t"'a&p')on; W - Wettable; WP - Wettable Powder

Tr.:1de .H~d ::,rand names arc: :JSl.'d .)nly foe tht ,..1..irpcse oi informati•ln .ind th., Virrtnia Coc~t:-rdtive i:xt~ns1c-n

Service does not guarantee nor warrant the standard of the product. nor doee it imply approval of the product to the exclusion of others which may also be suitahle.

KEYS TO PllOPD. USE Of PESTICIDES

1. Read the label on eal·h pesticide container before t>ach use. f,illaw instructions to the letter; heed all cautions and warning•. and note prPc.:uJtiona ab"ut residues.

2. Keep pestic~_des in the containers in vhich you bought them. Put them where children or animals cannot get to them, ti:'eferably under lock .:tnd avay from food, feed 9 seed, or other material ::.~n

may become harmful if contes......:.nc. t..-:d.

3. Dispose of empty eontainers tn the manner apec:tfied on the labeL

SE! YOUR DOCTOR IF SYMPTOMS OF ILLllESS OCCUit DU.ING OR Af"r!ll US! OF PESTICIDES.

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