scholarly journals Survival of Cercospora sojina on Soybean Leaf Debris in Illinois

2014 ◽  
Vol 15 (3) ◽  
pp. 92-96 ◽  
Author(s):  
Guirong Zhang ◽  
Carl A. Bradley
Keyword(s):  
United States ◽  
Southern Illinois ◽  
Cercospora Sojina ◽  
North Central ◽  
East Central ◽  
The North ◽  
Central United States ◽  
Soybean Leaf ◽  
Soybean Leaves ◽  
Central Illinois

Historically, frogeye leaf spot (FLS, caused by Cercospora sojina) of soybean has been observed more frequently in the southern United States than the north-central United States. However, in recent years, FLS field observations have increased in the north-central United States. To better understand the survival rate of C. sojina in Illinois, a field study was conducted at three locations: Monmouth (west-central Illinois), Urbana (east-central Illinois), and Dixon Springs (southeastern Illinois). At each location, soybean leaves affected by FLS were placed at depths of 0, 10, and 20 cm and retrieved at different durations up to 24 months. To determine the viability of C. sojina in the collected leaves, a greenhouse bioassay was used. Survival of C. sojina declined equally with time at all three locations through 19 months. After 24 months, C. sojina from leaves that had been placed at Monmouth and Urbana were no longer viable, whereas leaves that had been placed at Dixon Springs produced viable inoculum. Depth of leaf placement had no effect on survival of C. sojina at any of the locations. These results suggest that planting a nonhost crop for two years in central Illinois will reduce levels of C. sojina inoculum to a negligible amount; however, soybean farmers in southern Illinois may need a longer rotation for FLS management. Accepted 10 May 2014. Published 23 July 2014.

Epidemiology of Melampsoramedusae leaf rust of poplars in the north central United States

1980 ◽  
Vol 10 (3) ◽  
pp. 257-263 ◽  
Author(s):  
K. D. Widin ◽  
A. L. Schipper Jr.
Keyword(s):  
United States ◽  
Leaf Rust ◽  
North Central ◽  
East Central ◽  
Growing Seasons ◽  
The North ◽  
Central United States ◽  
Natural Range ◽  
Poplar Leaf ◽  
Populus Spp

Development of the aecial and uredial stages of Melampsoramedusae leaf rust of poplar in relation to the phenology of its hosts (Populus spp. and Larix spp.) was monitored from March until October during two consecutive growing seasons in central Iowa, east central Minnesota, and north central Wisconsin. Both years, in Wisconsin, larch needles flushed in early May and poplar leaves flushed in mid-May to late May. Aeciospores of M. medusae were found on spore traps only at the Wisconsin site (within the natural range of larch) from May 19 until the end of June in 1975 and 1976. Uredospores were present in the north central United States from mid-June through late September during both years. Temperatures between 15° and 20 °C and periods of precipitation favored uredospore production. Poplar leaf rust was found successively later at more southerly locations.

scholarly journals Genetic Variation of Sclerotinia sclerotiorum from Multiple Crops in the North Central United States

PLoS ONE ◽  
2015 ◽  
Vol 10 (9) ◽  
pp. e0139188 ◽  
Author(s):  
Laura Aldrich-Wolfe ◽  
Steven Travers ◽  
Berlin D. Nelson
Keyword(s):  
United States ◽  
Genetic Variation ◽  
Sclerotinia Sclerotiorum ◽  
North Central ◽  
The North ◽  
Central United States

Relation of algal biovolume to chlorophyll a in selected lakes and wetlands in the north-central United States

1995 ◽  
Vol 52 (2) ◽  
pp. 416-424 ◽  
Author(s):  
James W. LaBaugh
Keyword(s):  
United States ◽  
North Dakota ◽  
Chlorophyll A ◽  
Linear Relation ◽  
Algal Biomass ◽  
Open Water ◽  
Light Penetration ◽  
North Central ◽  
The North ◽  
Central United States

Algal chlorophyll a is commonly used as a surrogate for algal biomass. Data from three lakes in western Nebraska, five wetlands in north-central North Dakota, and two lakes in north-central Minnesota represented a range in algal biovolume of over four orders of magnitude and a range in chlorophyll a from less than 1 to 380 mg∙m−3. Analysis of these data revealed that there was a linear relation, log10 algal biovolume = 5.99 + 0.09 chlorophyll a (r2 = 0.72), for cases in which median values of chlorophyll a for open-water periods were less than 20 mg∙m−3. There was no linear relation in cases in which median chlorophyll a concentrations were larger than 20 mg∙m−3 for open-water periods, an occurrence found only in shallow prairies lakes and wetlands for years in which light penetration was the least.

Processing Snap Bean Variety Responses to Applied Nitrogen and Irrigation in the North Central United States

2015 ◽  
Vol 107 (4) ◽  
pp. 1401-1410 ◽  
Author(s):  
Yi Wang ◽  
Matthew D. Ruark ◽  
Amanda J. Gevens ◽  
Don T. Caine ◽  
Amanda L. Raster ◽  
...  
Keyword(s):  
United States ◽  
Snap Bean ◽  
North Central ◽  
The North ◽  
Bean Variety ◽  
Central United States ◽  
Applied Nitrogen

scholarly journals Management strategies for early‐ and late‐planted soybean in the north‐central United States

2020 ◽  
Vol 112 (4) ◽  
pp. 2928-2943
Author(s):  
Emma G. Matcham ◽  
Spyridon Mourtzinis ◽  
Shawn P. Conley ◽  
Juan I. Rattalino Edreira ◽  
Patricio Grassini ◽  
...  
Keyword(s):  
United States ◽  
Management Strategies ◽  
North Central ◽  
The North ◽  
Central United States
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