| Material Information
||Efficacy of an experimental chemical, Fosthiazate, for management of the Javanese root-knot nematode in tobacco, 1992
||IFAS NFREC Quincy research report
||3 leaves : ; 28 cm.
||Rich, J. R ( Jimmy Ray ), 1950-
North Florida Research and Education Center (Quincy, Fla.)
||North Florida Research and Education Center
||Place of Publication:
||Tobacco -- Diseases and pests -- Control -- Florida ( lcsh )
Nematode diseases of plants -- Control -- Florida ( lcsh )
||government publication (state, provincial, terriorial, dependent) ( marcgt )
non-fiction ( marcgt )
||Statement of Responsibility:
||Jimmy R. Rich.
||Research report (North Florida Research and Education Center (Quincy, Fla.)) ;
| Record Information
||University of Florida
||All rights reserved by the source institution and holding location.
||oclc - 84850596
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Copyright 2005, Board of Trustees, University
APR 1 5 1993
University of Florida
EFFICACY OF AN EXPERIMENTAL CHEMICAL,
FOSTHIAZATE, FOR MANAGEMENT OF
THE JAVANESE ROOT-KNOT NEMATODE
IN TOBACCO 1992
IFAS NFREC Quincy Research Report 92-13
Jimmy R. Rich
Route 3 Box 4370
Quincy, Florida 32351
The nematology program at the NFREC, Quincy, conducts research
to reduce nematode damage in crops that are important to north
Florida. Nematicide trials are a large part of this effort. The
trial reported herein was conducted to evaluate the efficacy of a
new chemical from ISK Biotech, fosthiazate, for management of the
Javanese root-knot nematode in flue-cured tobacco.
MATERIALS AND METHODS
The field trial was conducted at the IFAS Suwannee Valley
Agricultural Research and Education Center, Live Oak, in a Lakeland
fine sand soil (93% sand, 4% silt, and 3% clay) infested with the
Javanese root-knot nematode, Meliodogyne javanica. The field was
previously cropped to soybeans. In mid-March, the field was turned
with a moldboard plow to 10" deep and leveled by double discing.
On March 24, 1,3-D was applied with a single chisel in-row to a
depth of 12". Fosthiazate and fenamiphos were applied on April 3
as broadcast applications. Application of these materials was made
in 20 gal/A of water with a tractor-mounted CO2 sprayer containing
8004 teejet nozzles. The materials were double-disced to
incorporate to a depth of 3-5". All plots were bedded and "NK 326"
tobacco was transplanted 18" apart in-row on April 3. The trial
was arranged in a randomized complete block design containing six
replicates. Plots were 2 rows, each 44" wide, and 25' long. The
crop was maintained under irrigation during the growing season.
Tobacco was observed weekly for phytotoxicity. Root gall
ratings were conducted on two plants in each plot 121 days after
transplanting, using a gall scoring system of 0-4. Tobacco was
harvested 4 times, green weights recorded and converted to cured
weight (x 0.15). Tobacco yield was calculated to represent lbs./A
The 1,3-D and fenamiphos treatments significantly improved
tobacco yields as compared to the control (Table 1). No
significant differences in yield were found among the fosthiazate
treatments and any of the other chemical treatments or the control.
As rates of fosthiazate increased to 3.75 ai/A, tobacco yield
similarly and numerically increased among these treatments
Root-galling was significantly reduced by the two highest
rates of fosthiazate, and the 1,3-D and fenamiphos treatments
(Table 1). Lower root gall ratings were generally apparent as
rates of fosthiazate increased. No phytotoxicity was observed in
any of the treatments.
Tobacco yields were relatively low due to excessive moisture
resulting in leaching of applied fertilizer. Also, initial
populations of M. javanica were high with densities of 274/100 cm3
at planting. These factors may have contributed to the less than
optimum performance of the lower rates of the non-fumigant
nematicide, fosthiazate. These data suggest, however, that the
lower rates of fosthiazate (1.875 and 2.813 ai/A) did not provide
adequate control of M. javanica. Thus, it is suggested that rates
of 3.75 ai/A or higher should be tested in the future.
Table 1. Influence of nematicides on root gall index and tobacco
yield in a field infested with Meloidogyne javanica,
Rate/ Yield Root
Material Acre' lbs./A Galling2
1,3-D 6.000 gal. 2537 a 1.00 bc
fenamiphos 6.000 lbs. a.i. 2450 a 0.42 c
fosthiazate 3.750 lbs. a.i. 2253 ab 0.92 bc
fosthiazate 5.625 lbs. a.i. 2243 ab 1.09 bc
fosthiazate 2.813 lbs. a.i. 2011 ab 1.92 abc
fosthiazate 1.875 lbs. a.i. 1941 ab 2.25 ab
control -- 1578 b 3.25 a
S1,3-D (Telone II) was injected in-row with a single chisel; the
fosthiazate and fenamiphos were broadcast and double-disc
incorporated to 3-5" deep.
2 Root gall index ratings were based on a 0 4 scale with 0 = no
galling and 4 = 76% or greater of the root system galled.