MN - Vegetable IPM Newsletter

Table 1. Selected insecticide efficacy against black cutworm, 1988-99¹

Treatment

Rate
(lb AI/acre)

Rate
(Prod. -- fl oz/acre)

#Trials

% Control (range) ²

Ambush 0.10 6.4 5 78 (66-88)
Asana XL 0.03 5.8 2 94 (88-100)
Baythroid 2 0.025 1.6 2 83 (81-84)
Baythroid 2 0.030 1.9 2 94 (87-100)
Lorsban 4E 1.00 32.0 6 77 (44-88)
Pounce 3.2 EC 0.025 1.0 2 83 (80-85)
Pounce 3.2 EC 0.100 4.0 5 87 (79-100)
Pounce 3.2 EC 0.150 6.0 3 65 (41-100)
Warrior T 0.015 1.92 3 78 (76-79)
Warrior T 0.020 2.56 6 83 (59-98)
Warrior T 0.025 3.2 1 92 (--)
Warrior T 0.030 3.84 1 90 (--)

¹ Data based on studies conducted by Bessin (1999, KY), Shaw et al. (1996, IL), Gray et al. (1998, IL), Willson et al. (1999, OH), Oloumi-Sadeghi and Levine (1991, IL), Ostlie et al. (1992, MN), Chaddha et al. (1990, MN), Chaddha and Ostlie (1989, MN), and Berry (1988, IA).

² Percentage (%) control defined as reduction in cutting or feeding injury to corn seedlings, compared to the untreated check plots; rescue spray timing varied from 0 to 4 days, following natural or artificial infestations of black cutworm larvae.

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Last Revised June 6, 2001.
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