For instance, in 2011, Thompson et al. (2014) reported resistant, intermediate, and susceptible wheat cultivars treated with Quilt or Stratego producing yields 4.09%, −0.46%,
and 1.41% greater than the respective untreated plots.1 In 2012, Enzalutamide research buy these yield increases were 19.86%, 19.76%, and 15.67% respectively. Although our finding in 2012 could be attributed to differences in uncontrollable factors between the treated and untreated groups, it is possible that the disease severity in the untreated plots could have increased since the day it was last measured (i.e., an undetected late disease infection in the untreated plots). On the other hand, Zhang et al. (2010) and Hunger and Edwards (2012) explain that EGFR signaling pathway fungicides protect the yield potential by increasing the activity of the plant antioxidants and by slowing
chlorophyll and leaf protein degradation, which allows plants to keep their leaves longer and use more nutrients during late developmental stages (Morris et al., 1989 and Dimmock and Gooding, 2002). Several results, although expected, were also important to confirm. For example, similar to Orum et al. (2006), there were statistical differences in yields (Table 5) and net returns (Table 6) among locations during each year. Statistical differences in locations are usually attributed to agronomic practices such as crop rotation, soil quality, and disease severity (Orum et al., 2006), or attributed to different fungicides and temperature conditions (Tadesse et al., 2010). Statistical differences among locations in this study may be attributed to small differences in the two soil types, rainfall, elevations over the sea level, and/or several other uncontrollable factors such as temperature and wind (Table 2). There were also statistical differences in yield (Table 7) and net returns (Table 8) among the cultivars during each year. Thompson et al., 2014, Edwards et al., 2012 and Ransom and McMullen, 2008,
and Mercer and Ruddock (2005) explain that wheat cultivars that are susceptible to common foliar diseases are more likely to generate positive returns when treated with fungicide. Among the four cultivars considered in this study, Coker 9553 was the most susceptible cultivar to common foliar diseases, followed Metalloexopeptidase by Magnolia (Table 1). Among the untreated plots, Coker 9553 had the highest yield and it was statistically different from Magnolia and Pioneer 25R47 in 2011; and statistically different from the other three cultivars in 2012 (Table 7). Among the treated plots, Coker 9553 also had the highest yield and it was statistically different from the other three cultivars in both 2011 and 2012 (Table 7). Although Coker 9553 provided the highest average yield in each of the two years (Table 7), it did not necessarily provide the highest average net return from treatment in both years (Table 8).