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Copyright 2005, Board of Trustees, University
(g7 A Agricultural Research & Education Center
0 IFAS, University of Florida
5007-60th Street East
Bradenton, Florida 34203
Bradenton AREC Research Report BRA1983-23 July, 1983
PRELIMINARY HERBICIDE SCREENING FOR STATICE
J. P. Gilreath
Weed control in field grown statice (Limonium sinuata L.) in Florida has
received limited attention in the past and none of the more recent
herbicides has been evaluated for potential use. Although statice is
generally grown on raised, mulched beds, growers still have significant
weed problems in the row middles. In addition, spray drift is frequently
a problem when controlling weeds in row middles'.and statice is extremely
sensitive to vapors of at least one compound, paraquat. Drift of Lasso
has also been reported to be injurious to statice. Therefore; preliminary
screening of herbicides was conducted in the spring of 1983 to determine
their effects on statice growth.
Materials and Methods
'Kemps Blue' statice transplants, donated by Manatee Fruit Co., were
used in the experiment. One lot was transplanted into 6-inch pots
containing Myakka fine sand, while the second lot was transplanted into
a peat-perlite-sand medium in 6-inch pots. The first lot was transplanted
March 18, 1983 after the pots were treated with the various preemergence
herbicides on March 16 and 17. Applications were made with a CO
backpack sprayer delivering 26.6 gallons per acre. Immediately following
application, pots were watered to incorporate or activate the herbicide
treatments. Postemergence treatments were applied in the same manner on
April 4, 1983. Each treatment was replicated five times with single
plant experimental units. Significantly more flower panicles developed
on plants treated with Goal than on pla
The second lot of plants, which were grown in artificial medium,
was transplanted March 18, 1983 and treated with postemergence over the
top applications of all the herbicides on April 4 and 5 with a CO2
backpack sprayer delivering 26.6 gallons of spray preparation/acre.
This set of treatments was also replicated five times and was included
to determine any phytotoxicity from repeat in-the-row applications and
worst case drift when applications are made to row middles. Treatments
are listed in Tables 1 and 2. Plants were grown on outdoor benches and
were hand watered. The first lot of plants were harvested April 26 and
the second lot was cut May 3, 1983. Data on number of bloom spikes,
root establishment (rated where 1 = roots established and 2 = roots not
established or dead) and shoot fresh weight were recorded and analyzed
by analysis of variance and treatment means were ranked by Duncan's new
multiple-range test at the 5% level of significance.
~iAention of a specific herbicide does not constitute an endorsement by the
author or the University of Florida.
2Assistant Professor (Weed Scientist).
Results and Discussion
Statice appears to have tolerance to a number of herbicides (Table 1).
Only soil applications of Kerb and Sencor reduced shoot fresh weight to
a level less than that obtained in the untreated check. Due to the high
degree of variability among replicates, a number of herbicides which
reduced shoot weight relative to the untreated check did not produce a
statistically significant reduction. Based on shoot weight, the most
promising herbicides are Sonalan, Treflan, Prowl, Prefar + Alanap,
Ronstar (both formulations), Dacthal and Eptam. Although there were no
significant differences between the herbicide treatments and the
untreated check, root establishment was quite poor with Lasso, Devrinol,
Kerb, Sencor and Fusilade. Number of flower panicles was not affected
by the herbicide treatment compared to the check treatment, presumably
due to the extreme variability between replicates.
When preemergence herbicides were applied over the top of established
statice, Lasso, Devrinol, Sonalan, Treflan, Prowl, Prefar-t+ Alanap,
Ronstar (2G and 2EC formulations), Dacthal and Eptam did not reduce
shoot fresh weight compared to the check treatment (Table 2). It is
interesting to note that Devrinol applied over the top stimulated statice
growth relative to the check, but soil applications produced low shoot
weight. Kerb and Sencor applied postemergence were phytotoxic and
completely killed the plants.
Considering shoot weight data from Tables 1 and 2, the most promising
herbicides for additional future work are Sonalan, Treflan, Prowl,
Prefar + Alanap, Ronstar (2G), Ronstar (2EC), Dacthal and Eptam.
Influence of herbicide treatment on
conducted in pots. Bradenton, FL.
growth of 'Kemps Blue' statice in preliminary herbicide
Rate Method of No. of flower Root Shoot
Treatment (lb. a.i./A) applications panicles establishmenty fresh weight (g)
Check -- 1.6abc 1.4ab 90.2a-dx
Lasso 1.5 pre 1.4abc 1.9a 54.9d
Devrinol 2.0 pre l.0abc 1.9a 57.0d
Surflan 2.0 pre 1.4abc 1.6ab 59. d
Bolero 4.0 pre 1.2abc 1.2b 76.7a-d
Kerb 2.0 pre 0.4bc 1.9a 10.7e
Goal 0.5 pre 2.4a 1.2b 87.8a-d
Dual 2.0 pre 1.6abc 1.6ab 65.9cd
Sencor 0.5 pre O.Oc 2.0a O.Oe
Sonalan 1.0 pre 1.6abc 1.4ab 100.3abc
Treflan 1.0 pre 0.8abc .1.4ab 90.2a-d
Prowl 1.0 pre 1.2abc 1.2b 106.5ab
Prefar + Alanap 5.0 + 3.0 pre 0.4bc 1.4ab 104.3ab
Ronstar (2G) 4.0 pre 1.4abc 1.Ob 112.6a
Ronstar (2EC) 4.0 pre 0abc 1.6ab 86.9a-d
Dacthal 8.0 pre 1.8ab 1.4ab 100.7abc
Eptam 3.0 pre 1.4abc 1.4ab 106.3ab
Hoelon 0.5 pre 1.2abc 1.-6ab 89.2a-d
Poast 0.5 post 0.6bc I 2b 81.2a-d
Fusilade 0.5 post 1.2abc 1.9a 71.2bcd
Blazer 0.25 post 1.8ab 1.6ab 68.3cd
ZHerbicides were applied preemergence (pre) or postemergence (post). .
YRoot establishment was visually evaluated where 1 = roots established and 2 = roots not established.
XTreatment means followed by the same letter are not significantly different at the 5% level as determined
by Duncan's new multiple-range test.
Table 2. Influence
'Kemp Blue' statice
Bradenton, FL. Spri
of postemergence herbicide treatments on growth of
in preliminary herbicide screening conducted in pots.
(lb. a.i./A) Shoot fresh weight (g)
5.0 + 3.0
ZTreatment means followed by the same letter are not significantly different
-at the 5% level, as determined by Duncan's new multiple-range test.