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UC IPM Home > Home,
Gardens, Landscapes, and Turf > Pesticides > Acephate
How to Manage Pests
Pesticide Information
Acephate
Type
Insecticide -- organophosphate.
Plant uses
Ornamentals only; not registered for garden fruits and vegetables.
Pests controlled
Aphids, thrips, leafminers, lacebugs, leaf-feeding scales,
caterpillars, adult weevils, and other insects on ornamentals. This is a systemic material that, when applied to
leaves, is taken up and transported into other plant parts, making it especially effective against sucking insects
and insects such as leaf-curling aphids or leafminers that feed concealed within leaves.
 Hazards
to people:
Moderate to low, although it can break down
into methamidophos, which is highly toxic.
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Hazards
to wildlife:
Moderate to low.
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 Hazards
to beneficials:
Foliar
treatments have moderate to high toxicity to bees and parasites. Trunk injections have minimal impact on natural
enemies.
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Potential period of activity after treatment
1 to 2 weeks.
Precautions and safety equipment
Do not use near flowering plants. Wear a long-sleeved shirt, long pants, eye protection, a hat that
can be washed after each use, rubber gloves, and boots.
Active ingredient
O,S-dimethyl acetylphosphoramidothioate.
Application tips
Apply foliar sprays to cover plant completely. Acephate is also available in cap form as small plastic
units that are placed into drilled holes at several points around the tree trunk. Sap within the tree dissolves
the insecticide and translocates it up the tree. However, the drilling process can cause long-term damage to trees,
especially when repeated several years in a row, so this formulation should be used only with great caution. Caps
are effective against scales, aphids, and other sap feeders but not against borers and other chewing insects.
Always check the label before purchasing or applying a pesticide product for a specific pest on a specific plant
to be sure it can be applied. Follow label directions precisely.
WARNING ON THE USE OF CHEMICALS
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