Fungicides
Fourteen different fungicides were applied in a quantity of 4,796 lbs, representing 3.7% of the overall total pounds of A.I. applied (Table 9). Frequency of use ranged from <1 to 5.4%, with none of the fungicides used by more than 5.5% of the respondents. Quantities of each fungicide used ranged from 0.3 lbs to 2,022 lbs (Table 9). Three of the fungicides listed in Table 8 were used in quantities of approximately 700 pounds of A.I. or more, including 2,022 lbs of mancozeb, 1,526 lbs of chlorothalonil, and 686 lbs of PNCB.
| Table 9. Ohio Turfgrass Pesticide Use Report for 2001 by Active Ingredient (A.I.) – Pesticide Type, Fungicide, and Minor-Use Fungicide. | ||||
|---|---|---|---|---|
| Active Ingredient (A.I.) | Applicators Who Used A.I. (%) | A.I. Used (lbs) | Total Pounds of A.I. Used (%) | Mean Pounds of A.I. Used Per Acre (lbs/A) |
| Chlorothalonil | 5.4% | 1,525.7 | 1.2% | 6.892 |
| Iprodione | 1.8% | 108.9 | 0.1% | 0.009 |
| Mancozeb | 2.4% | 2,022.0 | 1.6% | 5.814 |
| Myclobutanil | 3.0% | 135.6 | 0.1% | 0.034 |
| PNCB | 3.6% | 686.3 | 0.5% | 11.0 |
| Propiconazole | 3.0% | 143.4 | 0.1% | 0.040 |
| Triadimefon | 5.4% | 106.7 | 0.1% | 0.894 |
| Minor-Use Fungicides | ||||
| Aluminum Tris | <1.0% | 0.3 | <0.1% | 0.009 |
| Fenarimol | 2.4% | 4.3 | <0.1% | 0.015 |
| Mefenoxam | 1.2% | 43.1 | <0.1% | 0.215 |
| Metalaxyl | <1.0% | 1.4 | <0.1% | 0.038 |
| Thiophanate-methyl | 3.0% | 16.4 | <0.1% | 0.312 |
| Trifloxystrobin | <1.0% | 1.0 | <0.1% | 0.004 |
| Vinclozolin | <1.0% | 1.1 | <0.1% | 0.063 |
The seven fungicides used by respondents in quantities of 44 lbs or less (Table 9) are classified as minor-use fungicides for this report. Most of the minor-use fungicides were used by less than 3% of the respondents, and each accounted for less than 0.1% of all the pesticide A.I.’s reported. Based on the quantities reported, fungicides were used on very limited acreage.
In addition to herbicides, insecticides, and fungicides, use of three other chemicals was reported, including dazomet, a soil fumigant used by two researchers to prepare research plots, and the plant-growth regulators mefluidide and trinexapac-ethyl used by two commercial applicators (Table 10). Both commercial applicators managed residential and commercial turfgrass, and one also managed school turfgrass and athletic fields.
| Table 10. Ohio Turfgrass Pesticide Use Report for 2001 by Active Ingredient (A.I.) – Pesticide Type, Other. | ||||
|---|---|---|---|---|
| Active Ingredient (A.I.) | Applicators Who Used A.I. (%) | A.I. Used (lbs) | Total Pounds of A.I. Used (%) | Mean Pounds of A.I. Used Per Acre (lbs/A) |
| Dazomet | 1.2% | 262.4 | 0.2% | 6.363 |
| Trinexapac-ethyl | <1.0% | 0.4 | <0.1% | 0.024 |
| Mefluidide | <1.0% | 0.2 | <0.1% | 0.010 |