© 2012 Plant Management Network.
The Pest Potential of Brown Marmorated Stink Bug on Vegetable Crops
Thomas P. Kuhar and Katherine L. Kamminga, Department of Entomology, Virginia Tech, Blacksburg, VA 24061; Joanne Whalen, Department of Entomology and Wildlife Ecology, University of Delaware, Newark, DE 19716; Galen P. Dively, Gerald Brust, and Cerruti R. R. Hooks, Department of Entomology, University of Maryland, College Park, MD 20742; George Hamilton, Department of Entomology, Rutgers University, New Brunswick, NJ 08901; and D. Ames Herbert, Virginia Tech Tidewater Agricultural Research and Extension Center, Suffolk, VA 23437
Corresponding author: Thomas P. Kuhar. firstname.lastname@example.org
Kuhar, T. P., Kamminga, K. L., Whalen, J., Dively, G. P., Brust, G., Hooks, C. R. R., Hamilton, G., and Herbert, D. A. 2012. The pest potential of brown marmorated stink bug on vegetable crops. Online. Plant Health Progress doi:10.1094/PHP-2012-0523-01-BR.
The brown marmorated stink bug, Halyomorpha halys (Stål) (Fig. 1), is an invasive insect from east Asia that was first reported in the USA near Allentown, PA, in the late 1990s (3). Since that time, the pest has spread rapidly across the United States, although significant pest densities and concomitant crop damage have largely remained centered in the mid-Atlantic from New Jersey to Virginia (2). The insect is highly polyphagous (1) and has been reported as a serious pest of tree fruit in the United States (4,2), but its damage and risk to vegetable crops has not been well documented to date. Herein, we report our observations from the mid-Atlantic United States on the relative pest risk that H. halys poses to vegetable crops.
Halyomorpha halys is a piercing sucking feeder that inserts its stylets into fruit, pods, buds, and stems of plants. Our on-farm and research plot observations in 2010 and 2011 suggest that vegetable crops appear to be attacked by H. halys from mid July until mid September. Vegetable crops directly bordering woodlots are at the highest risk of attack. Sweet corn (Zea mays L.) is a strongly-preferred host crop, on which more than 20 nymphs or adults have been observed on a single ear (Fig. 2). Stylets are inserted through the husk and pierce the tender kernels, which may cause them to become aborted, collapsed, or discolored (Fig. 3). In Beltsville, MD, in 2011, nearly 100% of sweet corn ears in early to mid-season plantings were injured by H. halys. Beans, in particular Phaseolus vulgaris L., are also attractive host plant. Feeding injury to beans may result in scarred, faded out sunken areas, and deformed pods (Fig. 4). Approximately 10 to 15% of snap bean pods were injured by this pest in Maryland and Virginia research plots in 2011. Later plantings of snap and lima beans and sweet corn in September and early October experienced less H. halys activity. These plantings possibly avoided injury because of the more attractive soybeans (Glycine max L. Merr.) grown nearby. Fruiting vegetables such as peppers (Capsicum annuum L.), tomatoes (Solanum lycopersicum L.), and eggplant (Solanum melongena L.) also can suffer heavy feeding damage from H. halys. Large numbers of stink bugs can build up in fields resulting in fruit rot and abortion (Fig. 5). Injury to fleshy fruit, like tomatoes and peppers, will produce white spongy areas on the skin and tissue damage internally where the feeding stylets were inserted into the fruit (Figs. 6 to 9). Okra (Abelmoschus esculentus Moench) is also fed upon by this pest resulting in deformed seed pods (Fig. 10). Almost 40% of okra pods were injured by H. halys and other bugs in Beltsville, MD, in 2011. Okra may be an indicator for potential feeding damage to another important crop in the Malvaceae family, cotton. Based on our observations thus far, the aforementioned crops have suffered the most damage from H. halys among the vegetables. Very little injury has been reported from cruciferous or cucurbit vegetables. However, these crops may be more attractive and susceptible if isolated and not grown close to more preferred host plants. Brown marmorated stink bug damage to other agricultural commodities also may become more extensive as the pest becomes further established in other areas.
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