Scouting time
Flea beetles attack the cotyledons at emergence and the first true leaves of seedlings producing pits or shot holes in leaves. Generally, flea beetles are less of a problem with later plantings of winter canola. Occasionally, overwintering flea beetles attack canola in the spring, but foliage is abundant and potential damage needs to be severe for treatment to be economical.
Sampling method
Visually observe beetles feeding on plants. Note that the small beetles can be hard to see as they tend to jump when disturbed.
Thresholds
A specific threshold is not listed, though plants can withstand 50 percent damage to the cotyledons without suffering any loss of yield potential. If populations appear high and feeding becomes excessive, stand reductions can occur.
Chemical control
|
Chemical Name |
Product(s) |
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|
Seed Treatments |
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|
Clothianidin - Poncho 600 |
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Imidacloprid - Dyna Shield Imidacloprid 5 |
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| Thiamethoxam - Helix Lite | 23 fluid ounces of product per 100 pounds of seed | |
| Foliar Sprays | ||
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Bifenthrin - Capture 2EC * |
0.033 - 0.04 LB/AI/A; 2.1 - 2.6 FL OZ/A |
|
|
Deltamethrin - Decis 1.5EC ** |
.009 Pounds AI/A; 0.8 Fl. Oz./A |
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Lambda-cyhalothrin - Warrior w/ Zeon Technology |
0.015-0.03 lb. a.i./A; 1.92-3.84 fl. oz./A |
|
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Gamma-cyhalothrin - Proaxis |
0.0075 - 0.015 lb ai/acre; 1.92- 3.84 fl oz/acre |
|
|
Methyl parathion - Methyl 4EC |
1 pint/acre |
|
| Carbaryl - Sevin 4F | .5 - 1 qt/acre |
*Apply in a minimum of 2 gallons of finished spray per acre by air or in a minimum of 10 gallons per acre with ground equipment. When applying by air, 1-2 quarts of emulsified oil may be substituted for 1-2 quarts of water in the finished spray. Thorough coverage is essential to achieve control. Do not apply more than 0.08 lb active ingredient (5.12 ounces) per acre per season. Do not make applications less than 14 days apart. Do not apply within 35 days of harvest
**Minimum Gallonage Requirements: For aerial applications use a minimum of 2 gallons of water per acre. For ground applications use a minimum of 5 gallons of water per acre for thorough coverage of the foliage. NOTES for Use on Canola, Crambe and Rapeseed: 1. DO NOT apply more than 1.5 fluid ounces of DECIS® 1.5EC per acre (0.018 lb ai/A) on Canola, Crambe, or Rapeseed in one growing season. 2. Allow 7 days between applications of DECIS® 1.5EC. 3. DO NOT apply DECIS® 1.5EC within 7 days of harvest.
Pesticide label directions and restrictions are subject to change, and some may have changed since this publication was written. Kansas State University entomologists assume no responsibility for product performance, personal injury, property damage, or other types of loss resulting from the handling or use of the pesticides listed. Remember, it is illegal to use a pesticide in a manner that is inconsistent with the label. The user bears responsibility for correct use. Always read and follow label directions carefully.
Non-chemical controls
None listed.
Content authors
Disclaimers
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