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Copyright 2005, Board of Trustees, University
University of Florida LIBR
CENTRAL FLORIDA RESEARCH AND EDUCATE I
I 4O Sanford, Florida
UL.U t)U 0 u-t
Research Report SAN 85-10 November 15, 984
i.F.A.S. -Univ. of Florida
CUCUMBER NEMATICIDE TRIAL U
H. L. Rhoades
Cucumber is an important vegetable crop in Florida with a reported value of
$36.9 million in 1982-83 produced on 15,900 acres. It is produced primarily on
fine sand type soils where it is attacked by several plant nematode species.
Particularly important are the sting nematode, Belonolaimus longicaudatus, and
the root-knot nematodes, Meloidogyne spp.
In the late winter and spring of 1984, a nematicide trial was conducted at
CFREC-Sanford on Myakka fine sand infested with B. longicaudatus, Meloidogyne
incognita, and the lance nematode, Hoplolaimus galeatus. It was designed to
determine the phytotoxicity of Telone II to cucumber when applied only one day
before planting (the normal waiting period is 14 days) and compare the efficacy
of this soil fumigant with several organophosphorus and carbamate nematicides.
The experimental design was a randomized complete block with five replicates.
Plot size was 5 feet (1 row) X 38 feet. The nematicides involved in the test were:
1. Telone II (dichloropropene), NOR-AM Chemical Company
2. Nemacur (fenamiphos), MOBAY Chemical Corporation
3. Mocap (ethoprop), Rhone-Poulenc, Inc.
4. Furadan (carbofuran), FMC Corporation
5. Counter (terbufos), American Cyanamid Company
6. Vydate (oxamyl), E. I. DuPont de Nemours & Company, Inc.
7. Standak (aldoxycarb), Union Carbide Agricultural Products Company
The cucumber ridges were prepared on February 27, 1984. On March 5, approxi-
mately 2 inches of the ridges were removed with a leveling board then Telone II
was applied by injection at 6 inches deep and at 10-inch intervals with a hand
fumigun. Granular formulations of Nemacur, Mocap, Counter, and Furadan were
applied in a 15-inch band and incorporated 2-3 inches with spiked rotary wheels.
Liquid formulations of Furadan, Vydate, and Standak were sprayed in a 15-inch band
then incorporated in the same manner as the granules. Liquid and granular formu-
lations of Furadan were also applied in the seed furrow just before planting and
liquid Vydate was applied as a foliar spray (4 weekly sprays beginning 2 weeks
after planting). 'Poinsett' cucumbers were planted on March 6. Normal cultural
practices were followed and the cucumbers were harvest 7 times during May 5 -
June 4. Soil samples were collected for ectoparasitic nematode population
determination on April 4 and the roots were indexed for root-knot nematode galling
on June 5.
The results are presented in Table 1. Surprisingly, Telone II applied only
one day before planting was only slightly phytotoxic. ,This was expressed in
slightly delayed germination (1-2 days). However, subsequent growth was rapid
Sand no plant injury was observed. All treatments, but liquid Furadan, applied in
the furrow greatly reduced sting nematode populations and all but Mocap and
Furadan (applied in the furrow) significantly increased yield. Only the soil
fumigant, Telone II, was effective for controlling the lance nematode. Telone and
Nemacur were the most effective against root-knot. Furadan applied as a liquid
* formulation in the seed furrow appeared to be phytotoxic since plants were stuntuc
with drooping leaves during early growth.
Table 1. Effect of nematicides on nematode populations and yield of cucumbers.
Sting Lance Root-knot Yield
Treatment Rate/A nemas nemas indexb (bu/A)
Check -- 68 240 4.07 106
Telone II 3 gal 20 4 1.47 527
Nemacur 2 lb 3 202 2.00 518
3 6 200 1.80 621
Mocap 2 12 159 3.57 314
3 4 206 2.57 197
Counter 2 8 263 3.97 426
3 3 204 3.41 449
Furadan 2 6 159 3.79 345
3" 18 135 3.73 391
(liq. 15-inch band) 2 36 219 4.27 438
(liq. in furrow) 2 62 260 4.10 217
granss. in furrow) 2 37 210 4.27 320
Vydate 2 28 202 3.60 571
(2 lb soil + 1 lb
foliar spray) 3 16 167 2.23 569
(4 foliar sprays) 2 11 172 2.50 508
Standak 2 7 227 3.03 599
LSD 0.05 0.72 227
aAverage number of nematodes extracted from 100 cc of soil.
bBased on an index of 1, no galling; to 5, severe galling.