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How to Manage Pests
UC Pest Management Guidelines
Corn
Grasshoppers
Scientific name: Melanoplus spp.
(Reviewed 1/06,
updated 1/06)
In this Guideline:
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Grasshoppers can be occasional pests of corn. In late summer and
fall, grasshopper eggs are laid in grassy foothills, on ditchbanks, along
roadsides and fence rows, in pasture areas, and in alfalfa fields. Eggs hatch
in spring and young nymphs feed on nearby plants. When wild grasses and other
plants become dry, grasshoppers migrate to irrigated croplands.
Grasshoppers feed
on foliage,
most often on the edges of fields near pasture areas or roadsides. They seldom
cause economically significant injury.
Topical treatments are most effective; treating field borders may be
adequate.
| Common name |
Amount/Acre** |
P.H.I.+ |
| (trade name) |
|
(days) |
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| The following
materials are listed in order of usefulness in an IPM program, taking into
account efficacy and impact on natural enemies. Also consider information
relating to water quality when choosing a pesticide.
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| A. |
CARBARYL* |
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(Sevin) 80S, XLR Plus |
10–24 oz |
Sweet corn: 2 |
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Forage: 14 |
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Fodder: 48 |
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MODE OF ACTION: A
carbamate (Group 1A)1 insecticide.
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COMMENTS: Ground or air application. |
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| B. |
MALATHION 8E |
1 pt |
Harvest or forage: 5 |
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MODE OF ACTION: An
organophosphate (Group 1B)1 insecticide.
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COMMENTS: Limited residual effectiveness. |
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UC IPM Pest Management Guidelines: Corn
UC ANR Publication 3443
Insects and Mites
L. D. Godfrey, Entomology, UC Davis
S. D. Wright, UC Cooperative Extension, Tulare County
C. G. Summers, Kearney Agricultural Center, Parlier
C. A. Frate, UC Cooperative Extension, Tulare County
Acknowledgement for contributions to the Insect and Mites section:
M. J. Jimenez, UC Cooperative Extension, Tulare Co.
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