Soybean diseases on the rise in Pennsylvania

By Blake Jackson

Despite widespread dry conditions in Pennsylvania, soybean farmers are facing challenges from several diseases. Extension agronomist Adriana Murillo-Williams explains that while foliar diseases are generally under control, stem diseases like sudden death syndrome, anthracnose, and white mold are on the rise.

The reason for this unexpected disease development lies in the microclimate variations within fields. Even with overall dry conditions, specific areas within a soybean canopy can experience high humidity and temperature, creating ideal conditions for disease pathogens.

Sudden death syndrome, caused by the fungus Fusarium virguliforme, is one disease of concern. This pathogen thrives in cool, wet conditions and is often associated with soybean cyst nematodes.

While initial infection occurs in the spring, symptoms like interveinal chlorosis and leaf death manifest during the reproductive stages.

Anthracnose, caused by the fungus Colletotricum truncatum, is another issue. This disease can infect soybeans at any stage of growth when conditions are warm and humid. Symptoms include brown spots on stems and petioles.

White mold, caused by the fungus Sclerotinia sclerotiorum, is favored by cool, moist conditions and dense canopies. Symptoms include gray to green discoloration of upper leaves, followed by necrosis and stem infection.

While it’s too late for disease treatment this season, careful scouting can help farmers prepare for next year. Identifying the presence of diseases now will allow for the selection of resistant varieties and early scouting in the upcoming growing season.

In addition to disease management, Pennsylvania farmers should consider applying for the Resource Enhancement and Protection (REAP) tax credits.

This program provides financial incentives for implementing conservation practices that benefit the environment and the farm. Eligible practices include no-till planting, precision nutrient application, cover crops, and riparian buffers.

Farmers are encouraged to review the program details as there have been updates to eligibility criteria.

Photo Credit: istock-sandramatic