Corn Yield Response to Foliar Fungicides in Dry Conditions
Rationale and Objective
- The potential for foliar fungicide treatments to be economically beneficial in protecting corn yield under moderate to high foliar disease pressure is well documented.
- Recent claims have also indicated possible plant health and drought tolerance benefits associated with strobilurin fungicide treatments even in the absence of significant disease pressure.
- Disease pressure is generally lower under drought conditions, as development and spread of several common foliar diseases is favored by moisture and humidity.
- The abnormally dry conditions experienced in IA and MO during the 2011 and 2012 growing seasons allowed evaluation of fungicide performance with low disease pressure.
||Field-length strips with strobilurin fungicides applied in strips perpendicular to the rows
||43 locations in IA and MO in 2011-2012
||4 per location, 34 total
- Plots were established according to standard C-Pro protocol of 4 hybrids planted at 4 populations per location.
- Yield monitor data from these plots were analyzed in Pioneer FIT Studio® to remove common sources of yield monitor error. Fifty-foot buffer areas were removed from the plots to account for potential drift from fungicide treatments in the checks.
- The average yield response to foliar fungicides in strip trials conducted in 2011 and 2012 was well below the average response observed in a survey of IA and MO on-farm trials conducted between 2007 and 2010.
- Yield results indicate that a foliar fungicide treatment is much less likely to be economically beneficial under low disease pressure associated with hot and dry conditions.
- Previous research has shown that hybrid response to fungicides can vary widely based on genetic disease tolerance and disease pressure. 2011-2012 results showed that hybrid response can vary even when pressure is low.
- Yield response to foliar fungicide treatment was not affected by plant population.
- Target fungicide applications based on hybrid genetic disease tolerance and local crop conditions.
- Consult with your local Pioneer sales professional for guidance on fungicide applications for the hybrids on your farm.
- When evaluating hybrid performance, don't compare treated vs. untreated hybrids; the variability in hybrid responses could result in misleading information on the value of a hybrid.
2011-2012 data are based on average of all comparisons made in 43 locations through 2012. Multi-year and multi-location is a better predictor of future performance. Do not use these or any other data from a limited number of trials as a significant factor in product selection. Product responses are variable and subject to a variety of environmental, disease, and pest pressures. Individual results may vary. All products are trademarks of their manufacturers.