The publications in this collection do
not reflect current scientific knowledge
or recommendations. These texts
represent the historic publishing
record of the Institute for Food and
Agricultural Sciences and should be
used only to trace the historic work of
the Institute and its staff. Current IFAS
research may be found on the
Electronic Data Information Source
site maintained by the Florida
Cooperative Extension Service.
Copyright 2005, Board of Trustees, University
CFS University of Florida
AGRICULTURAL RESEARCH AND EDUCATION CENTER
Research Report SAN 84-4 September 1983
S SWEET CORN NEMATICIDE TRIAL
SH. L. Rhoades
Sweet corn is an important vegetable crop ih Florida that has grown
from an annual production of approximately 6000 acres in 1947-48 to over
55,000 acres having a total value of over 61 million dollars in 1981-82.
Approximately 25 to 30% of the area in production consists of fine sandy
soils where the sting nematode, Belonolaimus longicaudatus, is a severe pest
of sweet corn as well as many other vegetable crops. While many other plant
nematodes parasitize and injure sweet corn, experience has shown that the
majority of yield losses on sandy soils in Florida have resulted from sting
In the late winter and spring of 1983, a nematicide trial was conducted
at AREC-Sanford on Myakka fine sand infested with B. longicaudatus and the
lance nematode Hoplolaimus galeatus. The experiment was designed to compare
the efficacy of the soil fumigant Soilbrom 90 (EDB) with several organophos-
phorus and carbamate nonfumigant nematicides. The experimental design was a
randomized complete block with five replicates. Plot size was 5 feet (2 rows)
X 38 feet (1.5 m X 11.6 m). The nematicides involved in the experiment were:
1. Soilbrom 90 (EDB), Great Lakes Chemical Corporation.
2. Nemacur (fenamiphos), MOBAY Chemical Corporation.
3. Mocap (ethoprop), Rhone-Poulenc, Inc.
4. Furadan (carbofuran), FMC Corporation.
5. Vydate (oxamyl), E. I. DuPont de Nemours & Co., Inc.
6. Counter (terbufos), American Cyanamid Company.
The EDB was injected 6 inches deep in-the-row with a single chisel
whereas the nonfumigants (Counter, Furadan, Mocap, Nemacur, and Vydate) were
all applied as granules in 15-inch bands and incorporated 2-3 inches deep
with rotary spiked wheels. In addition, Nemacur and Vydate were applied as
liquid formulations in water sprayed on the surface in 15-inch !ands, then
incorporated in the same manner as the granules. The EDB was applied on
Feb. 24, 1983, and all other treatments on March 2. 'Gold Cup' sweet corn
was planted on March 3. A stand count was made on-March 18, soil samples
were collected on May 12 for nematode population determination and the corn
was harvested on May 31.
The results are presented in Table 1. None of the treatments affected
standard ear size was significantly increased by all treatments. EDB,
Nemacur, and Counter greatly reduced sting nematode populations and yields
were increased significantly. Although there was no reduction of sting
populations by Furadan and Mocap and very little for Vydate, yields were
increased significantly. This may be due to early control or prevention of
I feeding by the nematodes until the corn was established, or through control of
soil insects. Only the soil fumigant EDB gave good control of lance nematodes,
however, yields were just as high in some of the nonfumigant treatments
indicating that this nematode had little effect on results of the test. Those
treatments providing best control of sting nematodes were the highest yielding.
Table 1. Effect of nematicides on nematode populations and yield
of sweet corn.
Nematodesx Avg. ear
Treatment Rate/A Sting Lance Standy wt. (Ib) Yieldz
Check -- 203 400 246 0.46 9
EDB 1.5 gal 18 21 298 0.58 30
Nemacur 2 Ib 4 233 276 0.57 25
3 13 244 272 0.58 30
Furadan 2 227 359 239 0.55 21
S3 248 676 271 0.58 22
Counter 2 4 374 274 0.60 28
S3 21 260 271 0.62 32
Mocap 2 241 617 279 0.56 23
3 262 400 266 0.57 23
Vydate 2" 211 430 284 0.55 21
3 137 504 278 0.56 19
Nemacur (liquid) 2 9 360 282 0.60 31
3 5 271 280 0.59 31
Vydate (liquid) 2 194 512 298 0.56 23
3 159 517 264 0.58 25
LSD .05 N.S. 0.07 7
xAverage number of nematodes extracted from 100 cc of soil.
YNumber of plants per plot.
Pounds obtained from 95 sq. ft. of plot.