Evaluation of Enclave fungicide for anthracnose and dollar spot control on a creeping bentgrass putting green 2013

摘要

The fungicide, Enclave, was evaluated for its effect on anthracnose and dollar spot. The study was conducted at the NC State Turfgrass Field Lab in Raleigh, NC on 'Dominant Plus' creeping bentgrass maintained as a golf course putting green. Plots weremowed 6 times per week at 0.140-in. (early Jan-15 Jul) and 0.150-in. (16 Jul-30 Sep) with clippings collected. The study was irrigated to prevent drought stress. Fertilizer was applied as 28-5-18 on 2 week intervals from mid-May through Aug. Acelepryn (4 oz/acre) was applied for control of insect pests on 24 Jun. Wetting agent was applied as Revolution (5 fl oz/1000 sq ft) every three weeks from 16 May through 28 Aug. QP Mefenoxam (1 fl oz/1000 sq ft), Segway (1.0 fl oz/1000 sq ft), and Subdue MAXX (1fl oz/1000 sq ft) were applied for control of Pythium diseases on 17 Jun, 15 Jul, and 8 Aug respectively. Individual plots were 3 ft x 6 ft and arranged in a randomized complete block with 4 replications. Treatments were applied in water equivalent to 2gal per 1000 sq ft with a CO2 powered sprayer equipped with a TeeJet AI9508E nozzle at 50 psi. All treatments were initiated on 12 Jun and reapplied as indicated in the table. Anthracnose severity (% turf area exhibiting symptoms) was assessed on 6 and 20 Aug and 4 Sep. Dollar spot was assessed as number of foci per plot on 26 Jun and 4 Sep. Algae development was evaluated as percent area infested on 20 Aug. Turfgrass quality was evaluated on 6 and 20 Aug and 4 Sep, using a 1 to 9 scale (9=best, 5=acceptable) based on color, density, and uniformity. Data were subjected to analysis of variance and means separation by Waller-Duncan k-ratio t-test (k=100).