Factors to Consider When Choosing a Corn Rootworm Soil Insecticide | ||||||
Organophosphates** |
Pyrethroids |
Phenylpyrazol |
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chlorethoxyphos (Fortress 5G) 3.0 oz/1000 row ft |
chlorpyrifos (Lorsban 15G & generics) 8.0 oz/1000 row ft |
tebupirimphos & cyfluthrin (Aztec .1G) 6.7 oz/1000 row ft |
terbufos (Counter CR) 6.0 oz/1000 row ft |
tefluthrin (Force G3) 4-5 oz/1000 row ft |
fipronil (Regent 4 SC) 0.24 fl oz/1000 row ft |
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Performance: test plots- |
2.9cd 79 |
2.8bcd 90 |
2.3ab 94 |
2.1a 95 |
2.3ab 100 |
n/a n/a |
Performance: test plots - infurrow application Root damage rating1,2 Consistency of performance (%)3 |
2.8bcd 85 |
2.6abc 86 |
2.2a 92 |
2.4ab 93 |
2.3ab 100 |
3.15d 83 |
1Average root damage rating (Iowa 1-6 scale) in 6-19 tests over five years, where damage in the untreated plots exceeded 3.5, the damage level above which economic losses are likely to occur. The untreated plots averaged 4.79. Only three years data available for Regent 4SC. |
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