Role of a Soil Fungicide and Two Nematicides in Maintaining Bermudagrass and Creeping Bentgrass Turf1
- R. V. Sturgeon and
- K. E. Jackson
Soil-borne pathogens and pests play an important role in the initiation of many turfgrass disease syndromes. Among these, plant parasitic nematodes and fungi damage the plant's root system. A healthy root system is needed to support optimum plant growth, so vital in the plant's ability to recover or withstand environmental stresses. The interaction between plant parasitic nematodes and soil-borne fungal pathogens has not been adequately investigated on turf. Symptoms of root diseases are commonly overlooked and attributed to other causes such as low fertility, drought, or damage from other pests.
Two non-fumigant nematicides, O,O-Diethyl O-[4-(methysulfinyl)phenyl] phosphorothioate (Dasanit®) and O-Ethyl S, S-Dipropyl Phosphorodithioate (Mocap®), and a soil fungicide, pentachloronitrobenzene plus 5 Ethoxy-3-trichloromethyl-1, 2, 4-thiadiazole (Terraclor Super-X®), were applied alone and in combinations to three cultivars: ‘Sunturf,’ ‘Tifgreen,’ and ‘U-3’, bermudagrass [Cynodon dactylon (L.) Pers.]. Plots receiving only Terraclor Super-X® 10-2.5G at 454 g ai (PCNB)/92.9 m2 when compared to non-treated plots made the greatest improvement in shoot density the 2nd year. Combinations of Dasanit® at 204 g ai/92.9 m2 and Terraclor Super-X® at 454 g ai (PCNB)/92.9 m2 were applied to an established creeping bentgrass (Agrostis palustris Huds.) nursery composed of a selection from ‘Seaside’ (HCC-7-2). Following severe moisture stress about 1 September, plots receiving summer (28 July and 22 August) applications of Terraclor Super-X®-Dasanit® combinations showed less than 10 % reduction in shoot density as compared to over 60 % reduction in non-treated plots. Bermudagrass plots receiving Terraclor Super-X® produced a significant increase in shoot density the second season and typical “Spring Dead Spots” filled in.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © 1980. . Copyright © 1980 by the American Society of Agronomy, Crop Science Society of America, Soil Science Society of America, and International Turfgrass Society, 5585 Guilford Rd., Madison, WI 53711 USA