Abstract
Successive mowing are the major maintenance costs of lawns. Thus, both the expenditure with mowing and the visual and physiological aspect of the lawn have led to the search for alternatives to mechanical management. Thus, this work aimed to study the effects of different rates of imazapic herbicide applied alone or combined with imazapyr as a growth regulator of Bahiagrass (Paspalum notatum) and St. Augustine grass (Stenotaphrum secundatum). The experimental design was a randomized block with four replicates, and the treatments consisted of six rates of imazapic herbicide (35; 70; 105; 140; 175 and 210 g a.i. ha-1) for both species, three rates of imazapic + imazapyr in tank mix (15.57 + 5.25; 23.625 + 7.875; 32.5 + 10.5 g a.i. ha-1) for Bahiagrass and four rates of imazapic + imazapyr mixture (7.875 + 2.625; 15.57 + 5.25; 23.625 + 7.875; 32.5 + 10.5 g a.i. ha-1) for St. Augustine grass. The effect of the treatments was evaluated by observing visible injury symptoms, canopy height, height and number of inflorescences and total dry matter of clippings. Applications of imazapic alone or combined with imazapyr were effective in reducing plant height, number and height of inflorescences and total amount of dry matter of clippings produced by Bahiagrass plants. Imazapic provided satisfactory control of St. Augustine growth, but its utilization caused an increase in the number of inflorescences present in the lawns.
Highlights
The grass species Bahiagrass (Paspalum notatum Flügge) and St
The experimental design was a randomized block with four replicates, and the treatments consisted of six rates of imazapic herbicide (35; 70; 105; 140; 175 and 210 g a.i. ha-1) for both species, three rates of imazapic + imazapyr in tank mix (15.57 + 5.25; 23.625 + 7.875; 32.5 + 10.5 g a.i. ha-1) for Bahiagrass and four rates of imazapic + imazapyr mixture (7.875 + 2.625; 15.57 + 5.25; 23.625 + 7.875; 32.5 + 10.5 g a.i. ha-1) for St
Applications of imazapic alone or combined with imazapyr were effective in reducing plant height, number and height of inflorescences and total amount of dry matter of clippings produced by Bahiagrass plants
Summary
The grass species Bahiagrass (Paspalum notatum Flügge) and St. Augustine (Stenotaphrum secundatum (Walter) Kuntze) are some of the main types of turfgrass used in lawns grown in the most diverse environments and for numerous purposes, whether in residential, industrial and public areas as well as in airports, parks, square gardens, roadsides and sports fields, found in countries with equatorial, tropical and subtropical climates (Li et al 2011; Coan et al 2012).One of the main characteristics of Bahiagrass is the formation of a dense lawn due to the interweaving of stolons that penetrate the soil and root. The visual aspect of lawns with this species can be damaged by the great number of flower stems, which often have shades of color that clash with the color of the grass blades (Gates et al 2004). Both blades and flower stems may reach excessive heights, requiring constant mowing to maintain plant height uniformity and visual quality of the lawn (Marchi et al 2016). St. Augustine grass, in turn, does not require much care when growing but requires medium to highly fertile and well-drained soils and adequate light conditions. In turn, does not require much care when growing but requires medium to highly fertile and well-drained soils and adequate light conditions
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