Bermudagrass ( Cynodonspp. ) and Seashore Paspalum (Paspalumvaginatum

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Bermudagrass ( Cynodonspp. ) and Seashore Paspalum (Paspalumvaginatum Powered By Docstoc
					          Bermudagrass (Cynodon spp.) and Seashore Paspalum
      (Paspalum vaginatum) Cultivar Response to the Sting Nematode
                     (Belonolaimus longicaudatus)
                            Wenjing Pang, William T. (Billy) Crow, and Kevin E. Kenworthy
                                                              University of Florida
           1. Determine the range of response (resistance or tolerance) of bermudagrass and seashore paspalum cultivars to the
               sting nematode and identify the best performing cultivars.
           2. Investigate if a proposed alternative method for assessing sting nematode response is as effective or more effi-
               cient than traditional methods.

Start Date: 2008                                 pot. The experiments were main-
Project Duration: three years                    tained at a temperature range of
Total Funding: $31,407                           24o C to 34o C under natural day-
                                                 light. They were trimmed at 1.0-cm
      While sting nematodes are found            mowing height and fertilized once
                                                 every other week using 18-3-6 (N-
most commonly in sandy coastal areas, the        P-K) at a rate of 2 kg / 100 m2 (4 lb
University of Florida Nematode Assay Lab         / 1000 sq. ft) per year.
has diagnosed this nematode on bermuda-                    Experiments were har-
grass from inland areas of Alabama,              vested 90 days after inoculation by
Mississippi, Arkansas, Louisiana, Georgia,       removing a 5-cm diameter core
Tennessee, Texas, Oklahoma, Kansas, and          from the center of each pot.
California.                                      Nematodes were extracted from
          Recent        cancellation        of   the soil cores and counted under a
fenamiphos          (Nemacur,           Bayer    microscope. Roots were analyzed
Cropscience) has resulted in the need of         using WinRhizo root scanning
better nematode management tactics.              software to determine root lengths
Currently, Curfew Soil Fumigant (Dow             and surface areas.
                                                                                          In 2008, two experiments were conducted using six cultivars of
                                                                                          bermudagrass in one experiment and three cultivars of seashore
Agrosciences) is the most effective man-                   Reproduction and mean paspalum in the second.
agement for sting nematodes. However,            nematode counts were greatest on                             Similar reductions between
Curfew is not cost effective and environ-        'Champion' bermudagrass with no differ- ‘Champion’ and other cultivars will be
mental restrictions highlight the need for       ences between the remaining cultivars. more detrimental to ‘Champion’ due to its
alternative options.                             Significant differences were not found smaller root system. Because ‘Champion’
          Utilization of resistant or tolerant   between the seashore paspalum cultivars. was a better host for sting nematode repro-
cultivars is the most efficient, least costly    However; biologically, 'SeaDwarf' was the duction (least resistant) and its root system
practice for nematode management on turf.        best host for sting nematodes.                     was more heavily damaged (poor toler-
Although a range in responses of bermuda-                  Mean total root length compar- ance), it was considered the most suscepti-
grass to sting nematodes has been found,         isons were made within a given cultivar for ble cultivar to sting nematode damage in
most cultivars were reported as suscepti-        its uninoculated and inoculated treatments. this study. ‘SeaDwarf’ supported higher
ble. Information about the responses of          For all cultivars except 'TifEagle', the inoc- nematode reproduction than other seashore
several newer bermudagrass and seashore          ulated treatments led to reductions in total paspalum cultivars.
paspalum cultivars is lacking.
          Separate glasshouse experiments
                                                 root length. Differences between uninocu-                      Summary Points
                                                 lated controls and inoculated treatments
for bermudagrass and seashore paspalum                                                                  The sting nematode caused damage to
                                                 were significant only for ‘Champion’
will be conducted to assess the range of                                                            ‘Champion’, ‘Sea Isle 1’, and ‘Aloha’.
                                                 bermudagrass, and ‘Aloha’ and ‘Sea Isle 1’
these species for response to sting nema-        seashore paspalum.                                     Sting nematode damage was not as sig-
todes. In 2008, two experiments were con-                  The percent reduction of                 nificant to ‘TifSport’, ‘Celebration’,
ducted using six cultivars of bermudagrass       ‘Champion’ was similar to all bermuda- ‘Floradwarf’, ‘TifEagle’, ‘Tifgreen’, or
in one experiment and three cultivars of         grass cultivars except ‘TifEagle’. ‘SeaDwarf’.
seashore paspalum in the second.                 However, the uninoculated root length of               ‘Champion’ was the most susceptible
          All cultivars were propagated by       ‘Champion’ was approximately one-third bermudagrass cultivar exhibiting poor
means of nematode free aerial stolons into       of the other greens-type uninoculated root resistance and tolerance.
clay pots (1,500 cm3) with a USGA sand.          lengths. This may be the basis for the dif-            ‘SeaDwarf’ exhibited better tolerance
Once established, inoculations were done         ference observed for its inoculated than other seashore paspalum cultivars
on June 21, 2008 using 200 nematodes per         treatment.                                         studied.
2008 USGA Turfgrass and Environmental Research Summary                   51

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