In eastern Nebraska soybean fields, soybean aphids have been spotted at low levels. Nature has sent its defenders to keep them in check. Scouting is the key to maintaining a harmonious balance and safeguarding yields. Let's explore these tiny warriors and how they influence the soybean aphid's life cycle.
Soybean aphids are soft-bodied, light green to pale yellow insects, just 1/16th inch long, and they have peculiar black-tipped cornicles on their rear abdomen. They primarily feast on the undersides of leaves and new soybean tissue. As the season progresses, their presence spreads to stems and pods.
These aphids have a complex life cycle with up to 18 generations in a year. To complete their life cycle, they require two different host plants: common buckthorn and soybean. Unfortunately for Nebraska, widespread buckthorn populations are lacking, which limits early season colonization by aphids migrating from buckthorn.
Nature provides natural defenders against aphids, including Asian lady beetles, flower bugs, green lacewings, damsel bugs, spined soldier bugs, parasitoids, and pathogens. These enemies regulate aphid populations and protect soybean yields in Nebraska fields.
Preserving natural enemies is crucial, as premature insecticide treatments can disrupt balance and cause population outbreaks for soybean aphids and spider mites. Eliminating these enemies can cause surges under specific weather conditions.
Soybean aphids can cause yellowed leaves, stunted growth, and reduced pod and seed counts. Early detection and monitoring are crucial for effective pest management. Integrated practices target pests when they reach economic or treatment thresholds, allowing natural enemies to perform their essential work.
Soybean aphid occurrence in Nebraska varies by region, with northeastern Nebraska more susceptible to economically damaging populations. Monitoring soybean growth stages is crucial, with historically damaging populations observed in late July or August during mid-reproductive stages.
Soybean farmers in eastern Nebraska should be careful and scout for aphids. Utilize nature's allies to maintain balance and optimize yields, allowing nature's defenders to guard your fields effectively.
For treatment recommendations and more information, visit the Soybean Aphid Scouting and Management guide.
Photo Credit: istock-urpspoteko
Categories: Nebraska, Crops, Soybeans