Full TGIF Record # 172086
Item 1 of 1
Publication Type:
Content Type:Abstract or Summary only
Author(s):Watschke, T. L.
Author Affiliation:Professor, Turfgrass Science
Title:Turfgrasses and plant growth regulators safety
Section:Weed control in turfgrass
Other records with the "Weed control in turfgrass" Section
Source:Turfgrass Research Results. 1992, p. 50.
# of Pages:1
Publishing Information:[University Park, PA: Pennsylvania State University, College of Agricultural Sciences, Agronomy Dept., Entomology Dept., Horticulture Dept., Plant Pathology Dept.]
Keywords:TIC Keywords: Growth regulators; Non-target effects; Growth; Chemical injury; Chemical safety; Mode of action; Gibberellic acid; Rooting; Tillers (vegetative); Environmental factors; Interactions
Abstract/Contents:"For decades, chemicals such as Maleic hydrazide have been available for use on turfgrasses to suppress seedhead emergence and reduce vegetative growth. Early chemicals were primarily mitotic inhibitors; and therefore, growth regulation was mostly a function of reduced cell division at all plant meristems. As a result, decreases in tillering, rooting, and stolon and rhizome growth have been reported as typical side effects of growth regulator use. In addition, some degree of foliar color change has frequently been observed. Depending on the species being treated, the chemical used, the rate, and time application all influence whether the plant responses cited above are either magnified or diminished. More recently, chemicals have been commercialized that primarily reduce growth via the inhibition of gibberellic acid. Thus, reduction of cell elongation is primarily responsible for reduced growth rather than a reduction in cell division. A rate dependent foliar discoloration has frequently been reported for turf treated with gibberellic acid inhibitors. However, decreased rooting and tillering have not been shown; and, in some studies, rooting and tillering have increased for treated turf. Resistance to wilting and greater water use efficiency have also been reported. The growth suppression due to inhibition of gibberellic acid can also be antidoted by foliar applications of gibberellic acid. Although little information exists on the influence of environmental conditions on growth regulator safety, it has been observed that greater injuries (both discoloration and thinning) more frequently occur if turf is treated while under heat and/or moisture stress. The safe use of plant growth regulators can also be influenced by other chemicals. For example, decreases in safety have been found when mitotic inhibitors have been applied in combination with gibberellic acid inhibitors. Also, gibberellic acid inhibitors have been observed to cause more injury when used with fungicides that also have been shown to interfere with gibberellin biosynthesis. Other fungicides and nitrogen fertilizers have been shown to improve growth regulator safety."
Note:Reprint appears in Proceedings of the 47th Annual Meeting of the Northeastern Weed Science Society, vol. 47 1993, p. 135
This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Watschke, T. L. 1992. Turfgrasses and plant growth regulators safety. Turfgrass Research Results. p. 50.
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