![]() Economic thresholds for each species are listed in Table 1. Combine counts of older nymphs (larger than 1/4 inch in length) and adults. Adults tend to aggregate, so sample several areas in each field. To scout for stink bugs, use sweep nets or shake plants over a drop cloth. Scouting and Economic Thresholds for Stink Bugs Spined soldier bug nymph ( Photo by Russ Ottens, University of Georgia) and adult ( Photo by Marlin E. The spined soldier bug adult is easily identified by its sharply pointed "shoulders" and dark brown spot on the wing tips. Both the immature and adult stink bugs of this species are predatory and will kill many soybean pests, including green cloverworm. The most common beneficial stink bug in Iowa soybean is the spined soldier bug. Spined soldier bug ( Podisus maculiventris) ![]() Some are beneficial and will use their mouthparts to pierce the body and suck out the internal fluids of a variety of soybean pests, particularly caterpillars, beetle larvae and adult beetles. Remember, not all stink bugs found in soybean are pests. Red shouldered stink bug nymphs and adult. However, when flipped over, there is no spine on the abdomen. Adults are green and just under ½ inch long they have markings that are very similar to the red banded stink bug. This pest has also been reported in several states but is somewhat easier to manage than the red banded stink bug. Red shouldered stink bug ( Thyanta custator custator) Photos by Russ Ottens, University of Georgia. Adults are green and just under ½ inch long they can be identified by the two strips (one yellow and one dark red, purple or black) across the "shoulders." When flipped on its back, a spine is visible on the red banded stink abdomen between the third pair of legs. Nymphs are mostly green with red and black markings. It has presented management challenges, especially in Louisiana, and has a lower economic threshold than the brown stink bug. This pest has been observed in Arkansas, Louisiana, Mississippi, Missouri, and Tennessee and has spread quickly throughout these states. Red banded stink bug ( Piezodorus guildinii) Their eyes are deep red.īrown marmorated stink bug nymph ( Photo by Gary Bernon, USDA APHIS) and adult ( Photo by David R. Nymphs have a yellowish to off-white abdomen, and at the last stage before adulthood, the abdomen will have reddish spots. Additionally, they have small, round coppery or metallic blue depressions on the head and pronotum. Adults have light bands on the antennae and dark bands on the membranous part of the wings. "Marmorated" refers to their marble-like coloration. Since then, it has been identified in many states in the continental U.S., including Iowa. Originally from Asia, this pest was first found in Pennsylvania in 1998. Scout carefully!īrown marmorated stink bug ( Halyomorpha halys) None have been documented causing serious damage in Iowa, but these species are on the move. In addition to these well-known species, several economically important stink bugs from other regions are now entering the Cornbelt. The underside of their abdomen is yellow to light green.īrown stink bug nymph and adult. As an adult, the brown stink bug is brown with slightly rounded shoulders. These nymphs are light greenish brown and will develop brown spots on the middle of the abdomen as they get older. Adults are light green, shield shaped, and have fully developed wings. Green stink bug nymphs are black with bright green and yellow or red markings. They usually begin feeding in soybean in early August. This pest migrates up from southern states each summer and has only one generation per year in Iowa. The species below are known to occasionally cause problems for Iowa producers. Because herbivorous stink bugs build up in soybean after bloom, they can be found feeding on developing pods, resulting in shriveled, desiccated seeds. Most species are herbivores but a few are beneficial predators. ![]() Stink bug nymphs and adults are fluid feeders with piercing-sucking mouthparts. Stink bugs are often more prevalent in soybean fields around this time of year, especially in the southern half of the state. By Rebekah Ritson and Erin Hodgson, Department of Entomology ![]()
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