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Updated: October 23, 2024

Managing Slugs in Field Crops Using IPM Principles (FS-2022-0629)

Slugs damage corn and soybean seedlings by rasping holes, with most problems occurring in high residue no-till fields that provide moist habitat. Slug baits are the most effective chemical control and an IPM approach helps reduce yield loss and maximize profits. Authors: Praise-God Igwe, Maria Cramer, David Owens, Galen Dively, and Dr. Kelly Hamby; Title: Managing Slugs in Field Crops Using IPM Principles" (FS-2022-0629)
Updated: October 23, 2024

Podworms in Soybeans

Podworms in Soybeans
Figure 1. Corn earworm/soybean podworm moths are robust, light brownish-tan with a 1” to 1 1/2” wingspan. They have a prominent dark spot on each forewing. They tend to be active during the evening and dark hours but can be commonly seen in fields during the day. Photo by Ronald Smith, Auburn University, Bugwood.org.
Updated: October 23, 2024

Corn Earworm Pheromone Trapping

Current corn earworm pheromone trap captures in Maryland and Delaware and pest management recommendations.
Image of a corn earworm larva
Updated: October 23, 2024

Slug Damage to Soybeans—Do Cover Crops Help or Hurt?

Reports of slug damage to emerging soybean seedlings (Glycine max) have increased in recent years, though their activity is highly variable from field to field, and within a field from year to year. Spring, 2021 weather was both cool and wet, conditions that many slug species find ideal. Slug eggs overwinter in the soil, hatch in the spring, and the juvenile slugs can begin causing damage to crops in just a week’s time after hatching (Hammond et al. 2009).
Figure 1. A meadow slug feeding on an emerging soybean.
Updated: October 23, 2024

Agronomy News IPM Scouting Tips

Agronomy News IPM Insect Scouting Tips
Updated: October 23, 2024

Fungicide Efficacy Tables for Control of Corn and Soybean Diseases

The Crop Protection Network (cropprotectionnetwork.com) is a national working group comprised of Extension agents and specialists from across North America that provide data through publications regarding pest management in agronomic crops. The website and publications can be a great resource for your operation. The following are the most recent fungicide efficacy tables for foliar diseases of corn and soybean.
Updated: October 23, 2024

General Recommendations for Managing Nematodes in Field Crops (FS-1082)

Nematodes are an economically important pathogen of many crops in Maryland. Significant yield loss can occur if nematodes are not managed properly. This factsheet serves as a broad introduction to nematodes as plant pathogens and serves as a general guide for sampling and managing nematodes in Maryland. Title: General Recommendations for Managing Nematodes in Field Crops (FS-1082); Author: Andrew Kness
Updated: October 23, 2024

Scouting For Podworms

It's time to start scouting for podworms (Helicoverpa zea) in double-crop soybeans. There have been reports of high numbers of small and young pod worms and soybean loopers in double-crop soybean on the Delmarva. Podworms prefer fields that are flowering, open canopy, and stressed and have been recently sprayed with a non-selective insecticide. Their population can be spotty, so one field can be high while the field next to it is low, so the only way to know what is happening in a particular field is to sample it. You can sample for podworms using either a sweep net or drop cloth.
Figure 1. Yellow colored podworm feeding in soybean. Image: Clemson University, USDA Cooperative Exension Slide Series, Bugwood.org
Updated: October 23, 2024

August IPM Insect Scouting Tips

August IPM insect scouting tips on soybean, field corn, and sorghum.
Figure 1. Spider mites on underside of soybean leaf viewed through 10x hand lens.
Updated: October 23, 2024

September IPM Insect Scouting Tips

Soybeans: Continue scouting for corn earworm, stink bugs, and soybean looper in double-crop fields. Defoliation thresholds at R5 are 15% and between 20 and 30% at R6. Corn earworm pheromone trapping information for Maryland can be found at https://extension.umd.edu/resource/corn-earworm-pheromone-trapping. NC State Extension has a good CEW threshold calculator can be used to help decide if it is worth treating: https://www.ces.ncsu.edu/wp-content/uploads/2017/08/CEW-calculator-v0.006.html. Stink bug thresholds are 5 bugs per 15 sweeps until the soybeans reach the R7 stage, after which treatment for stink bugs is not necessary.