Start Date

1-12-1994 12:00 AM

Description

Growing conditions in 1994 were quite favorable overall, but the variability of weather this year resulted in some areas with substantially wetter or drier than normal conditions for some portion of the season. Serious disease problems are often associated with weather conditions outside the norms. Some diseases can be expected to appear almost every year, and 1994 was typical in regard to some of the common corn and soybean diseases. In corn, there were some problems with Fusarium crovm rot, common smut, northern leaf blight, Gibberella ear rot and stalk rots caused by Gibberella zeae and Colletotrichum graminicola {anthracnose). However, the most serious diseases on corn were late season outbreaks of gray leaf spot and eyespot. In soybeans, individual growers suffered some losses due to seedling diseases, Rhizoctonia, Fusarium, and Phytophthora root rots, soybean cyst nematode, brown stem rot, and others. The two diseases that received particular attention on soybeans this year were white mold (Sclerotinia stem rot) and sudden death syndrome. Both diseases are fairly new to Iowa soybeans. In the case of white mold, substantial losses occurred in some fields. Severe losses to sudden death syndrome have not been observed in Iowa.

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Dec 1st, 12:00 AM

Diseases of Corn and Soybeans in 1994

Growing conditions in 1994 were quite favorable overall, but the variability of weather this year resulted in some areas with substantially wetter or drier than normal conditions for some portion of the season. Serious disease problems are often associated with weather conditions outside the norms. Some diseases can be expected to appear almost every year, and 1994 was typical in regard to some of the common corn and soybean diseases. In corn, there were some problems with Fusarium crovm rot, common smut, northern leaf blight, Gibberella ear rot and stalk rots caused by Gibberella zeae and Colletotrichum graminicola {anthracnose). However, the most serious diseases on corn were late season outbreaks of gray leaf spot and eyespot. In soybeans, individual growers suffered some losses due to seedling diseases, Rhizoctonia, Fusarium, and Phytophthora root rots, soybean cyst nematode, brown stem rot, and others. The two diseases that received particular attention on soybeans this year were white mold (Sclerotinia stem rot) and sudden death syndrome. Both diseases are fairly new to Iowa soybeans. In the case of white mold, substantial losses occurred in some fields. Severe losses to sudden death syndrome have not been observed in Iowa.