Thursday, April 12, 2012

Virginia: Brown Marmorated Stink Bug Appearing In Sweet Corn – Treatment Options

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I was contacted recently by a VCE Agent in Frederick Co. Mark Sutphin about my recommendations for stink bug bug control in sweet corn. Frederick County is one of the counties that has very high densities of the invasive brown marmorated stink bug.



After sending him my reply, I thought that others in Virginia may also benefit from this information. So here it is below:

Fortunately for sweet corn producers, unlike tree fruit growers, BMSB should not cause any drastic changes in chemical control strategies unless the grower is relying primarily on transgenic Bt sweet corn for worm control. Bt will not control stink bugs. Most of the insecticides that growers are already spraying on sweet corn should control BMSB.

The table below is a copy of the insecticide performance report based on our research on vegetable crops in Virginia in 2011.

In the western portions of Virginia, probably applications twice per week during silking and until harvest should control them even under heavy pest pressure. In eastern counties, insecticide applications at least 3 times per week are probably needed to control both corn earworm and the BMSB.

T. Kuhar, H. Doughty, K. Kamminga, L. Lilliston, J. Jenrette, A. Wallingford, A. Wimer and C. Philips
Department of Entomology, Virginia Tech, 216 Price Hall, Blacksburg, VA 24061-0319; tkuhar@vt.edu

Selected insecticides were evaluated at Virginia Tech in 2011 using green bean dip bioassays on brown marmorated stink bug nymphs and adults, as well as field efficacy trials on bell peppers. For the latter, four weekly spray applications were made using a backpack sprayer, and % stink bug injury to pepper fruit was assessed on three post-spray harvest dates (in Aug). Insecticides were ranked based on their average performance across all three experiments.

Product
Rate oz/Acre
% mortality from bean dip bioassay*
Nymph
% mortality from bean dip bioassay*
Adult
% control in the field: peppers**
Avg. % control from all three experiments
* Mortality refers to the percentage of dead + moribund individuals after 72 hrs.
** Based on reduction in stink bug injury to pepper fruit from three harvests.
a Not the highest labeled rate for all vegetables.
Permethrin 3.2EC897.598.860.685.6
Scorpion 3.247.776.790.085.484.0
Bifenture 10DF12.8100.081.956.379.4
Trebon8100.0100.036.578.8
Baythroid XL2.892.588.252.877.8
Venom 704100.080.046.075.3
Endigo ZC4.575.098.749.274.3
Acephate 97UP16100.051.870.474.1
Lannate LV4066.775.379.873.9
Leverage 3602.8 a97.374.549.973.9
Brigadier9.8576.770.069.972.2
Hero EC10.391.750.072.871.5
Vydate L4885.047.079.770.6
Warrior II2.5100.072.838.070.3
Belay475.067.566.769.7
Actara 50 WG5.566.781.060.369.3
MustangMax4100.035.072.869.3
Danitol1693.342.560.365.4
Assail 30 G490.032.870.464.4
Lambda-cy3.8486.032.362.060.1
Asana XL935.027.576.446.3

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