Stink Bugs on Corn, Millet & Sorghum
· Millet · Sorghum · Maize
Stink bugs attack corn mainly during seedling or early vegetative stages. Seedlings may produce extra tillers (added branching) to compensate for the damage on the main stalk. The bugs feeding habit on leaves is characterized by a pattern of repeating equidistant holes or rows. The holes vary greatly in size but are usually oblong or elongated with a yellow halo surrounding them. A slimy, decaying area may be found in the stalk where the stink bug has fed. Heavily infested plants tend to have a deformed shape, stunted growth and poor yields. The ears may also show deformations, late maturation and often poor kernel filling. Stink bugs are very good fliers and spread readily between crops, causing consequent yield loss.
The aspect of these bugs varies slightly depending on the species. Adults of the brown stink bug are shield-shaped with mottled brown, leathery wings and a characteristic triangular pattern on their back. Eggs are barrel-shaped and laid in clusters on the leaves. Nymphs are nearly round and black and wingless. Adults and nymphs damage the plant with their sucking mouthparts, piercing tissues and injecting substances to digest the content, then re-ingesting the dissolved plant material. This causes malformation or stunted growth, even more so if populations are large. On fruits and seeds, the feeding causes stains and imperfections that impact the quality of the product. Stink bugs have a wide range of alternative hosts like weeds and several grains crops such as soybeans, vegetables and alfalfa.
Parasitic tachinid flies and wasps lay eggs into the eggs of stink bugs and their larvae later feed on the hatching maggots. Birds and spiders can also help to reduce infestation. The oil of Eucalyptus urograndis is toxic to the bugs and their nymphs.
Always consider an integrated approach with preventive measures together with biological treatments if available. Seed treatments with insecticides of the pyrethroids group may provide some control and avoid damage in seedlings. Foliar application of insecticides based on acephate, dicrotophos and bifenthrin can also help to control populations.
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