Fungicide Efficacy in NCLB Management
- Research has demonstrated the economic value of fungicide applications depends on the primary factors of disease pressure, application timing, and hybrid susceptibility
- No disease threshold for NCLB
- High residue due to reduced and no-till practices and corn after corn rotation can lead to an increase in inoculum
- Even at low levels of NCLB pressure, fungicide application has shown an economic benefit
Figure 4. Average yields from 40 Pioneer® GrowingPoint®agronomy trials in Iowa in 2015 comparing DuPont™ Aproach® Prima fungicide applications with low, moderate, and high NCLB pressure.
- Corn hybrids have varying levels of genetic resistance to NCLB
- Pioneer hybrids vary from a score of a 3 to 6 on a 1 to 9 disease scale (1 = susceptible to 9 = tolerant)
- Fungicide applications protect yields of all hybrids including moderately-resistant hybrids
Figure 5. Average yields from 40 Pioneer GrowingPoint agronomy trials in Iowa in 2015 illustrating the yield advantage of a fungicide application on Pioneer® brand hybrids with varying disease scores.
- The goal is to protect yield by preventing infection on the ear leaf and above as the plant enters the reproductive stage
- DuPont Aproach Prima fungicide is most effective when applied prior to disease infection or soon after infection
- Fungicides applied at tasseling to early silking stages (VT to R1) have the greatest likelihood of an economic return
Figure 6. Field trial comparing DuPont Aproach Prima fungicide pretassel applications in corn to untreated corn with high NCLB pressure.
Figure 7. Average yields from 40 Pioneer GrowingPoint agronomy trials in Iowa illustrating the value of timely fungicide applications.