How to Manage Pests
UC Pest Management Guidelines
Cucurbits
Grasshoppers
Scientific Name: Melanoplus spp.
(Reviewed 12/09, updated 12/09, pesticides updated 5/16)
In this Guideline:
Description of the Pest
Grasshoppers may occasionally attack cucurbit crops, particularly if planted adjacent to foothill rangeland. They normally migrate from the range into cultivated areas as vegetation on the rangeland dries up.
Damage
Grasshoppers destroy leaf tissue and, if present in extremely large numbers, will consume the entire plant. They may also chew on fruit, scarring the surface and netting of cantaloupes.
Management
Keep fields and surrounding areas weed-free. Grasshopper problems usually occur when a migrating population from a foothill range area is attracted to the crop. Plant a trap crop between the crop and the direction that the grasshoppers might migrate from. The trap crop can be treated with cryolite, if allowed by the label. Treat the crop if feeding damage warrants control action.
Common name |
Amount per acre |
REI‡ |
PHI‡ |
(Example trade name) |
|
(hours) |
(days) |
UPDATED: 5/16 |
|
The following are ranked with the pesticides having the greatest IPM value listed first—the most effective and least harmful to natural enemies, honey bees, and the environment are at the top of the table. When choosing a pesticide, consider information relating to air and water quality, resistance management, and the pesticide's properties and application timing. Not all registered pesticides are listed. Always read the label of the product being used. |
|
A. |
CARBARYL |
|
(Sevin 5 bait) |
20 lb |
12 |
3 |
|
MODE-OF-ACTION GROUP NUMBER1: 1A |
|
COMMENTS: Apple pumice baits work better for crickets and grasshoppers than bran baits. Baits lose their attractiveness as they dry out. Apply in early evening to avoid drying out too soon from sun exposure. Use suitable ground or aircraft equipment that provides good distribution. Repeat application probably necessary. |
|
. . . or . . . |
|
(Sevin XLR Plus)* |
0.5–1.5 pt |
12 |
3 |
|
COMMENTS: Observe plant response precautions listed on the label. Avoid excessive applications. Be certain spray volumes are appropriate to assure adequate coverage. Use low rate for nymphs and high rate for adults. |
|
B. |
LAMBDA CYHALOTHRIN |
|
(Warrior II with Zeon)* |
1.28–1.92 fl oz |
24 |
1 |
|
MODE-OF-ACTION GROUP NUMBER1: 3A |
|
C. |
ESFENVALERATE* |
|
(Asana XL) |
5.8–9.6 oz |
12 |
3 |
|
MODE-OF-ACTION GROUP NUMBER1: 3A |
|
COMMENTS: Repeat as necessary to maintain control. Do not exceed 0.25 lb a.i./acre per season. |
|
D. |
MALATHION |
|
(Malathion 8-E) |
Label rates |
See label |
See label |
|
MODE-OF-ACTION GROUP NUMBER1: 1B |
|
![[Precautions]](/IMAGES/btn-precautions_bul.gif)
UC IPM Pest Management Guidelines: Cucurbits
UC ANR Publication 3445
Insects and Mites
E. T. Natwick, UC Cooperative Extension, Imperial County
J. J. Stapleton, UC IPM Program, Kearney Agricultultural Center, Parlier
C. S. Stoddard, UC Cooperative Extension, Merced & Madera counties
Acknowledgment for contributions to Insects and Mites:
R. L. Coviello, UC Cooperative Extension, Fresno County
C. B. Fouche, UC Cooperative Extension, San Joaquin County
L. D. Godfrey, Entomology, UC Davis
J. B. LeBoeuf, AgiData Sensing, Inc., Fresno
M. Murray, UC Cooperative Extension, Colusa and Glenn counties
C. G. Summers, Entomology, UC Davis and Kearney Agricultural Center, Parlier
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