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Tuesday, January 23, 2018

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2597. Herrman, T. and M.V. Wiese. 1984. Foot rot control in winter wheat using tillage, rotation, variety, fungicide, and nitrogen variables.. ID Agr. Expt. Sta. CIS #737.
Worst infection with conventional tillage; Stephens a more resistant variety; 3 yr rotation had lowest level, also lower levels with peas versus lentils; fungicides increased yields 4-6 bu/ac; no effect of level of N fertilizer; evidence from other areas that green manure could reduce infection levels; late fall tillage reduces infection; reduced tillage intensifies other diseases such as Cephalosporium stripe and Fusarium root rot. T: disease incidence by tillage, variety, fungicide.

4774. Murray, Tim. 1990 Jan.. Fungicide resistant footrot in wheat.. presentation at STEEP Annual Review, Moscow, ID.
Strawbreaker footrot (Pseudocercosperella herpotrichoides) is becoming resistant to some common fungicides (Benlate, Topsin, Mertek). Incidences have been documented in continuous wheat and in 2 and 3 year rotations. Crop rotation will give moderate control. Two new varieties have some resistance to the disease - Hyak and Madsen. Delayed seeding date is the best control strategy. Dealy about 7-10 days, so planting occurs in late September. For crop monitoring, a 10% obvious infection is the economic threshold for treatment. There appears to be reduced footrot in reduced tillage systems.

5735. Rasmussen, P.E. and C.R. Rohde. 1988. Stubble burning effects on winter wheat yield and N utilization under semiarid conditions.. Agronomy J. 80:940-942.
Burning vs. not burning was examined at 3 nitrogen levels over 6 years (3 crops). Burning had no effect on grain yield or grain N uptake. Burning increased straw yield when wheat was fertilized by N, but had no effect on straw N uptake. Burning did not decrease foot rot incidence or severity, but did reduce downy brome density. T: Effects of stubble burning and N fertilization on grain and straw of winter wheat 1980-85. Effect of stubble burning on foot rot infection. Effect of stubble burning on downybrome infestation.

11057. Cook, R.J.. 1980. Fusarium foot rot of wheat and its control in the Pacific Northwest.. Plant Disease 64:1061-1066.
Fusarium foot rot occurs mainly in low to intermediate rainfall areas of the PNW (20-40 cm) where wheat is grown after fallow. The disease appears related to water stress. Sometimes nitrogen use can induce water stress and was blamed for the disease. Wheat varieties vary in their susceptibility to the disease. The disease can be controlled by minimizing pathogen population increases and by reducing or delaying water stress. Oats should be avoided since they are an excellent host for the disease. Actions to improve water infiltration and storage reduce the chance of water stress. By maintaining residue on the surface, airborne saprophytic fungi will colonize it and prevent Fusarium from doing so. N applications should be based on realistic yields so water stress will not be induced. September seeding, rather than August, avoids excessive foliar growth which can induce water stress.

11067. Cook, R.J. and J.T. Waldher. 1977. Influence of stubble-mulch residue management on Cercosporella foot rot and yields of winter wheat.. Plant Disease Reporter 61:96-100.
The stubble-mulch method of residue management at Pullman, WA, did not favor more Cercosporella foot rot than the moldboard plow method. Foot rot was generally less severe on wheat in stubble-mulched plots, apparently because of poorer wheat growth already in early fall. This poorer wheat growth in certain years was not corrected by benomyl application. In general, Cercosporella severity was directly proportional to plant size and vigor in the fall, regardless of tillage method.

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