![]() Droughty conditions are often favorable for the fall armyworm because many of their natural enemies are less active during droughts. Fall armyworm damage is most likely to occur from August through October when populations are at seasonal highs. This “Y” distinguishes the fall armyworm from other armyworm species. ![]() The head of the fall armyworm is marked with a light-colored, inverted Y-shape (Figure 2). Image: Blake Layton, MSU-ES.įall armyworm larvae may range in color from light green to almost black, with several stripes along the body. Female fall armyworm moths can lay egg masses of fifty to several hundred eggs, which means large densities of fall armyworms can build up quickly. The female moths arriving from southern states will seek young, tender foliage in which to lay their eggs. The size and timing of the initial moth flights are two factors that influence the outbreak potential of this pest. As a result, populations can show up throughout most of the eastern US in the late summer and fall months. They are susceptible to cold and cannot successfully overwinter in more northern areas however, fall armyworm moths are strong fliers and with the help of air currents they make their way north each year. Weather conditions have allowed fall armyworm to flourish this year, so producers are encouraged to be on the lookout for potential problems.įall armyworm (Figure 1) is a tropical moth native to warm climate areas of the western hemisphere. In Maryland, there have been cases reported across much of the state so far, including Anne Arundel, Baltimore, Charles, Calvert, Frederick, Howard, Montgomery, Prince George’s, St. There are numerous reports of heavy fall armyworm activity coming out of Virginia, Kentucky, Indiana, Illinois, Ohio, and other states. ![]() ![]() Amanda Grev, Pasture and Forage Specialist | of Maryland ExtensionĪlthough fall armyworm ( Spodoptera frugiperda) is a native pest to North America and a chronic pest in the southeastern US, reports of fall armyworm activity and outbreaks are unusually high this year. ![]()
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