Agriculture and Natural Resources Spraying and Dusting Tomatoes
Cutworms
insects and diseases that may damage plants or reduce fruit quality. Plants
near the soil line by various species of
Insect Pests Control: Prepare seedbeds and Flea Beetles
the seedbed or in the field early in the season. When disturbed, these insects
Tomato Fruit Worm Tomato Fruit Worm
following transplanting. Spray or dust the plants in flats or bed before transplanting. Repeat in field as necessary.
Control: Materials suggested for
flea beetle control are listed in the spray table.
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University of Arkansas, United States Department of Agriculture, and County Governments Cooperating
Winter is spent in the pupal or resting stage in
Control: Hand pick, spray or dust. Horn worms
the soil. The adult, a tan-colored moth with a wing
are controlled by the regular schedule of applications
span of about 1 3/4 inches, lays eggs on legume crops
very early in the spring. Here the first generation is passed. Second generation moths start laying eggs
Horn Worm
the last of May and early June. The second generation causes heaviest damage to tomatoes.
Control: To control tomato fruit worm, apply
insecticides regularly every seven days beginning at fruit set. Cover the entire plant with a dust or spray. If foliage injury is noticed after using Sevin, discontinue its use. The tomato fruit worm control program also controls flea beetles, blister beetles and horn worms. Beginning at fruit set, carefully consider a fungicide. Sprays must be repeated after rains.
Some insects may attack tomatoes before the
regular insecticide schedule for tomato fruit worm is started. These insects and control measures for
Pink or green aphids become very numerous on
the underside of leaves and on stems early in the season.
Wireworms Control: Any of the pesticides recommended in
Larvae of click beetles (wireworms) sometimes
the table under aphids will give control.
attack roots of tomatoes. These larvae are slender and the body wall is hard. Where wireworms have been
Stink Bugs
troublesome rather consistently or where tomatoes follow sod, control is necessary.
Several species, brown, green, blackish, with or
without markings, may be found in tomato fields.
Control: Treat the soil with diazinon (see table
They are shield-shaped and up to 5/8-inch long and
for suggested dosage). Work thoroughly into the upper
1/3-inch wide. Nymphs resemble adults but are
4 to 8 inches of soil. Soil temperature should be at
smaller, and wing development is incomplete. All
least 50°F when diazinon is applied. Check the
stink bugs discharge a foul odor. Adults and nymphs
container label for granule dosage information.
suck juice from the plant and fruit. Feeding damage results in a small, whitish depression around the
Blister Beetles
puncture as well as wilting of the leaves.
Striped, black or gray beetles about 1/2-inch long
Control: Refer to the table for control measures.
often attack tomato foliage. These beetles may move
Dust or spray should be equally effective with
into a field in swarms, completely defoliating plants
Control: Blister beetles are controlled by the
regular schedule of applications for tomato fruit
Mites are green or red and so small they are
scarcely visible without a magnifying glass. Mites are usually favored by dry weather. They move to tomato
Horn Worms
plants from other host plants where they have fed during the winter and early spring. Light webbing on
These large, green caterpillars with a spine on the
the underside of leaves, leaf distortion and discol
back near the rear-end feed on foliage. The worms
oration indicate the presence of spider mites. Sevin
may be spotted most readily from droppings on the
and pyrethroids may increase mite problems if mites
Control: See the table for materials to use. Spraying
Several applications of miticide may be necessary to control mites.
Mixing these materials in 75 to 100 gallons of
water gives enough solution to thoroughly cover the
Spraying and Dusting
foliage and stems of one acre of mature tomato plants. For younger, smaller plants use the same dilution, but less gallonage will be required per acre.
After plants have been set in the field, fungicide
and insecticide applications normally are necessary to
hold the leaf spotting and fruit diseases and various insects in check.
Fungicides and insecticides can be applied in dust
form. However, in disease control, spraying has
Combination Sprays
given consistently better results than dusting. Up to 40 pounds of dusting material may be required to
Combining an insecticide and a fungicide in one
adequately cover 1 acre of mature plants. Younger,
spray may be desirable. Diazinon and Sevin are not
smaller plants require proportionately less material.
compatible with fixed copper fungicides. Any other
Dust formulations may contain varying percentages of actual pesticide chemical. These percentages may
combination of an insecticide and a fungicide listed in
vary from 4 to 10 percent. Never should the amount
the table should be satisfactory, but a jar test will
of actual active pesticide per acre exceed the amounts
Tomato Insect Control Recommendations Formulation/ Application, Remarks/ Insecticide Lb ai/Acre Precautions Fruit worm Horn worm
Guthion 2L (R)
bifenthrin (R) Bacillus thuringiensis 1/2 lb/A may be used in combination with either Thiodan or methomyl. Other areas have had good results.
Asana XL 0.66 EC (R)
Warrior 1EC (R)
Lannate 2.4 LV (R)
Lannate SP (R)
zeta-cypermethrin (R) (R) = Restricted Use Pesticide. Formulation/ Application, Remarks/ Insecticide Lb ai/Acre Precautions Cabbage loopers endosulfan
Asana XL 0.66 EC (R)
Lannate 2.4 LV (R)
Lannate SP (R) Colorado potato
Guthion 2L (R) Flea beetles Stink bugs
bifenthrin (R)
zeta-cypermethrin (R) Leaf miners
Agri-Mek 0.15 EC (R)
Mites, leaf miners, pinworms, potato beetle.
Guthion 2L (R)
bifenthrin (R)
Diazinon AG500 (R)
4 lbs/gal Diazinon 50 W (R)
Diazinon AG600 (R)
Asana XL 0.66 EC (R)
Lannate 2.4 LV (R)
Lannate SP (R)
zeta-cypermethrin (R) Formulation/ Application, Remarks/ Insecticide Lb ai/Acre Precautions Cutworms
bifenthrin (R)
Asana XL 0.66 EC (R)
zeta-cypermethrin (R) Wireworms
Diazinon 50W (R)
Diazinon AG600 (R)
Diazinon AG500 (R) Spider mites
Agri-Mek 0.15 EC (R)
Guthion 2L (R) Pinworms
Agri-Mek 0.15 EC (R)
Lannate LV (R)
Lannate SP (R)
plastic coil that is wrapped around tomato vines or support stakes.
Tomato Spraying and Dusting Schedule - Home GardenersAmount to Mix with Insecticide 1 gal water Application Remarks and Precautions Tomatoes Flea beetle Fruitworm Horn worms Stink bugs Blister beetles Cutworms
Mix 3-6 inches deep in the soil just prior to planting time. Whitefly Slugs and L = Liquid Concentrate; EC = Emulsifiable Concentrate; WP = Wettable Powder; S = Soluble Powder or Sprayable Powder; R = Restricted Use Pesticide. Home tomato growers should consult Extension MP 144, “Insecticide Recommendation for Arkansas,” to determine the amount of insecticide to use in one gallon of water. Insecticide or fungicide labels will also furnish this information.
The information given herein is supplied with the understanding that no discrimination is intended and no endorsement by the Cooperative Extension Service, University of Arkansas, is implied. The agrichemical recommendations herein are consistent with current federal and state pesticide labeling as of the date of this publication. Revisions in labels can occur at any time. For your safety before using any recommended pesticide, always read the product label.
Acknowledgment is given to DR. DONALD R. JOHNSON, Extension entomologist (retired), the original author of this fact sheet.
Printed by University of Arkansas Cooperative Extension Service Printing Services.
DR. JOHN D. HOPKINS is Extension entomologist, University of
Issued in furtherance of Cooperative Extension work, Acts of May 8 and
Arkansas Cooperative Extension Service, Little Rock.
June 30, 1914, in cooperation with the U.S. Department of Agriculture, Director, Cooperative Extension Service, University of Arkansas. The Arkansas Cooperative Extension Service offers its programs to all eligible persons regardless of race, color, national origin, religion, gender, age, disability, marital or veteran status, or any other legally protected status,
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Agriculture and Natural Resources 
Winter is spent in the pupal or resting stage in
Control: Hand pick, spray or dust. Horn worms