![]() ![]() Differences in grub tolerance were however, observed to be a function of turfgrass cultivar. Few species related differences were identified. Grub survival and weight gain, foliar growth and root loss were compared among turfgrass species and cultivars. Turf grown in pots in the greenhouse was infested with second and third instar larvae in this two year study. Ten cultivars of seashore paspalum were comparedįor their response to Japanese beetle, Popillia japonica Newman, larval root feeding. Seed germination at temperatures below 25C in light with 0.2% KNO3 was less that 20% at 3 weeks. The highest germination rate observed at 3 weeks was 75% at 25:35C with a 12h photoperiod using 0.2% KNO3. Seeds were germinated at various constant temperatures (20, 25, 30, and 35C), and diurnal temperatures (20:30, 25:30, and 25:35C (night:day)) with and without light, and in distilled water or 0.2% KNO3. Experiments were conducted to determine the effect of environment (light, temperature and KNO3) on seed germination responses in seashore paspalum. Seed from the pilot production of this cultivar harvested by Turf Seeds in Oregon during 2002 demonstrated a high level of seed dormancy with a tetrazolium test of 91% but a germination rate of only 5% at room temperature. The first seeded cultivar of seashore paspalum has been developed. Great promise for continued improvement of the level of salt tolerance within this halophytic species. The genotypic variability among ecotypes demonstrated in this experiment combined with the development of a screening method to efficiently identify ecotypes with superior salt tolerance offers Two new genotypes, SeaIsle Supreme and SI 99 with salt tolerance levels superior to any previous reports were identified. Salt tolerant cultivars are expected to have the ability to maintain growth and thereby have minimal reduction in total biomass when exposed to salt. Higher ratings of visual appearance of turf quality presented as leaf firing ratings and higher biomass production (clip weight, verdue weight, crown and root weight, and total biomass weight) are positive indicators of salt tolerance. Large genotypic differences were observed for all traits measured. Progress 01/01/06 to 12/31/06 Outputs Six replications of 15 genotypes including 14 seashore paspalum genotypes and one ultra-dwarf bermudagrass genotype, TifEagle were simultaneously evaluated in a greenhouse study at each of three salt concentrations. Impacts investigator retired 2007 Publications PROJECT MODIFICATIONS: Not relevant to this project. ![]() TARGET AUDIENCES: Not relevant to this project. Progress 10/01/02 to 09/30/07 Outputs OUTPUTS: investigator retire 2007 PARTICIPANTS: Not relevant to this project. Responses, deep rooting capability/persistent root plasticity. TALL FESCUE: stress tolerance evaluations involving acid soils, drought, high heat and humidity, disease (especially brown patch-Rhizoctonia solani) Investigations into bioremediation capabilities of paspalum. Development of a seeded seashore paspalum. Ecotype assessment for various insect and disease responses. ![]() Greens management protocols to maximize performance. Investigations into variable release fertilizer products to streamline judicious use of fertilizers on paspalum. Best management practices (BMPs) will be developed for preemergence and postemergence herbicide efficacy on paspalum including encroachment issues with other grass species. Winter hardiness traits will involve an initial strategy involving molecular modulation of bioactive gibberrelic acid content. Project Methods SEASHORE PASPALUM: Using multiple environmental stresses (acid soils, high/low temperatures, cyclic drought, salinity, high bulk density non-expanding clay soils) to identify persistent rooting ecotypes. ![]()
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