Development of Different Grass Species with the Use of the Growth Regulator Trinexapac-Ethyl

Abstract

-The use of synthetic compounds to retard the growth of lawns aims at reducing the number of operations for their maintenance. Thus, the main goal of the present study was to evaluate the effect of different doses of trinexapac-ethyl on the development and rooting of five different grass species. Bahiagrass, St. Augustine grass, Japanese lawn grass, Bermuda grass and, broadleaf carpetgrass were grown in pots of 20 L. The experimental design was completely randomized, with four replications. ) was applied at doses of 113+113, 226+113, 226+226, 452+113, 452+226, 452+452 in a sequential spraying, and also at single doses of 678 and 904. The second application was carried out 14 days after the first. On the day prior to applications all species were cut at 3 cm height. The phytotoxicity evaluations were performed weekly, and evaluations on plant height, number and height of inflorescences, biomass of aerial parts and roots were carried out 35 days after the second application. The trinexapac-ethyl application was effective in inhibiting the development of the Japanese lawn grass, Bermuda grass and broadleaf carpetgrass when applied in sequential doses higher than 226 g ha and, the visual appearance of lawns was not affected. In the case of St. Augustine grass and Bahiagrass species, the growth regulator did not promoted reduction in the growth of both grass species. Keywords: Paspalum notatum, Stenotaphrum secundatum, Zoysia japonica,Cynodon dactylon, Axonopus compressus, plant growth regulator. RESUMO -

Paclobutrazol as growth regulator in Bahiagrass

“…On the other hand, other growth regulators such as Trinexapac-ethyl in different doses had no effect on reducing dry mass for studied species (Marchi et al, 2017), as well as Prohexadione-calcium in split applications (Marchi et al ., 2016). When a product is used as a growth regulator, it is essential that it does not decrease leaf chlorophyll concentration (Gazola et al, 2016), as this will affect the turfgrass physiological processes, as well as green colour characteristic (Santos et al, 2019), and the relative chlorophyll index (RCI) results demonstrate this fact (Figure 3).…”

“…Studies on Brazilian conditions for growth control in Bahiagrass have been published in recent years (Marchi et al, 2016;Marchi et al, 2017;Barbosa et al, 2017;Dias et al, 2019), however none of them use Paclobutrazol as a growth regulator. In this context, the objective of the present study was to evaluate the use of Paclobutrazol doses as growth regulators in Bahiagrass.…”

Paclobutrazol and phenoxaprope-P-ethyl potential as growth regulator in Carpet grass Plus®

“…However, according to Kreuser (2015), mowing may be difficult due to the embankment slope, and also, resulting in higher expenses (Santos and Castilho, 2018). Thus, an alternative to this management would be the use of plant growth regulators (Dinalli et al, 2015;Marchi et al, 2017;Dias et al, 2019;Gazola et al, 2019). It has the function slower the plant growth, without causing visible damage, such as necrotic spots of phytotoxicity, discoloration or thinning, but allowing the maintenance of its aesthetics and characteristic green colour (Gazola et al, 2016;Dias et al, 2019).…”

“…It is a compound of triazole group and reduces plant growth by blocking the action of the enzyme ent-kaurene oxidase, which inhibits the conversion of ent-kaurene to ent-kaurenol, which prevents the formation of any type of gibberellin (Glab et al, 2020). On the other hand, for several products such as trinexapac-ethyl and prohexadione-calcium and the herbicides, imazethapyr, metsulfuron-methyl, imazaquin and glyphosate (Dinalli et al, 2015;Marchi et al, 2017;Queiroz et al, 2017;Dias et al, 2019;Gazola et al, 2019) there are reports as being used in lawns for growth control. However, for phenoxaprope-P-ethyl (post-emergent selective herbicide, which has phenoxaprope-P-ethyl as an active ingredient, which acts as an ACCase enzyme inhibitor) (Bayer, 2019) there is no use for this purpose.…”