Plantation Field Laboratory Mimeo Report 63-1
NEMATODES AND THEIR CONTROL IN TURF GRASS
J. A. Winchester
During 1962 a large number of lawns were sampled for nematode identification
in St. Lucie, Martin, Palm Beach and Broward Counties. St. Augustinegrass was
sampled most frequently. From this survey it appeared that all of our lawn
grasses may be parasitized by most of the plant nematodes that are known in
South Florida. One exception to this is an undescribed cyst nematode which was
found only on St. Augustinegrass.
A greenhouse test was made to study the pathogenicity of several nematodes
on seven different grasses in sandy soil. The results of this study are sum-
marized in the following table:
Roselawn St. Augustinegrass
1/ Rated from 0-4 for none to severe reduction in growth and vigor of the grass.
Both of the root knot nematodes used in the study are common to Florida and
their feeding resulted in moderate to severe stunting and yellowing of the grass
although the root knot galls were very small. The Cyst nematode did not survive
and caused no injury to the Bermudagrass but its feeding on St. Augustinegrass
caused very severe stunting and yellowing.
A nematocide test was started on March 15, 1963 in an Ormond Bermudagrass
planting at the Plantation Field Laboratory. Sting nematodes were present in
low numbers in all plots.
/ Prepared for presentation at Field Days at Plantation Field Laboratory,
Ft. Lauderdale, on May 1 and 2, 1963.
/ Assistant Nematologist, Everglades Experiment Station, Belle Ga de, Fla.
The treatments in this test and a gross vigor rating made on April 19, 1963
are given below:
Bayer 25141 10%
Bayer 25141 lo
Rate/100 sq. ft.
Average Vigor 1
SVigor rating of 0-4 for increase in grass vigor compared with untreated grass.
A St. Augustinegrass lawn in West Palm Beach with a large cyst nematode
population was treated on March 1, 1962 with DBCP at the rate of 1 pint per
700 square feet applied as a drench. This treatment was applied at monthly
intervals for 3 months. Four months after the study was initiated no larvae
or viable eggs were found in the treated plots while large numbers were found
in the untreated plots. The treated grass recovered its green vigorous condi-
tion while the untreated plots were very stunted.