SAG RIIU SJU ,AL RSFARCHIAND-EDUCATION -C NTER
I ... Quincy, Florida JUN 29197
Quincy AREC Mimeo Report NF-1972-1
REDUCING PESTICIDE RESIDUES ON CIGAR-WRAPPER TOBAC jcFL%8IEUi of EiOrTda
William B. Tappan
Pesticide residues on tobacco of all types have become a major concern of tobacco
growers in all the tobacco producing areas of the World. West Germany has taken action to
make effective as of January 1, 1973, stringent pesticide residue restrictions on all tobacco
leaf and products imported into that country. Other countries, and particularly those of the
European Common Market, are expected to follow West Germany's lead in passing residue
legislation of some type in the near future. With that prospect in mind, the countries
exporting tobacco to European markets will have to insure that their tobacco leaf and products
meet the residue requirements.
In view of current residue data, the flue-cured tobacco grower in the United States is
in an apparently good position with respect to pesticide residues on that particular tobacco
type. However, it is evident that the cigar-wrapper tobacco grower in the Florida-Georgia
area must do something to reduce pesticide residues on wrapper tobacco in order to meet the
residue restrictions proposed by West Germany.
With the advancement of insect control technology over the past 20 years, the reduction
of pesticide residues on cigar-wrapper tobacco without jeopardizing insect control is within
the realm of possibility.
A program of reducing pesticide residues on cigar-wrapper tobacco in the Florida-Georgia
area is outlined in the following table. If the grower plans to transplant the crop on or
about March 15, he would need to apply Diazinon, 15% granules broadcast on the soil surface
and incorporate the material to a depth of 4 to 6 inches about March 1 for wireworm control.
As soon as the Diazinon has been applied, an application of Dylox, 5% bait should be broad-
cast on the soil surface and left undisturbed for about 2 weeks before transplanting for
cutworm control. The day before or the same day as transplanting, an application of Di-Syston,
15% granules should be broadcast on the soil surface and incorporated to a depth of 2 to 4
inches for aphid and flea beetle control. The Di-Syston treatment will give protection to
the tobacco foliage against aphids and flea beetles for about 6 weeks after transplanting.
No other applications of an aphicide should be needed during that period of time. Approxi-
mately 2 to 3 weeks after transplanting, foliage applications of Bacillus thuringiensis should
begin and continue on a weekly schedule for the remainder of the growing season to control
budworms, cabbage loopers and hornworms. Should any of the worm pests or aphids become a
problem later in the season, the grower could use an application of Thiodan, 4% dust or
Lannate, 2.5% dust or 0.125% spray as a spot-treatment to effect needed control. The Bacillus
treatments will leave no chemical residue on the leaf. If Thiodan or Lannate applications
are needed, it would be advisable to limit the number of applications of either material to 2
each. In a season of moderate insect infestations, late applications of Thiodan or Lannate
may not be needed.
The grower must remember that if this program is to be effective, the weekly schedule
of Bacillus applications must be adhered to strictly.
AGRICULTURAL RESEARCH AND EDUCATION CENTEf
PEST CONTROL PROGRAM FOR REDUCING PESTICIDE RESIDUES ON CIGAR-WRAPPER TOBACCO
IN THE FIELD
Weekly-2 to 3
14% G, 15 lbs. Soil
5% B, 20-30 lbs. Soil
15% G, 15-27 lbs. Soil
ASC, S, 1-2 qts.
WP, S, 1-3 lbs. or
2.5-5.0% D, 20-30 Ibs.
4% D, 15-20 lbs.
2.5% D, 12-20 Ibs.
90% SP, 0.55 lb.
90% SP, S, 0.55 lb.
Cabbage Loopers, and
Cabbage Loopers, and
IB = Bait, D = Dust, G Granules, ASC = Lqueous Suspension Concentrate, WP = Wettable Powder,
SP = Soluble Powder, and S Sprays.
2As Needed When these materials are applied, Bacillus applications are not needed.
30ne application of Thiodan and Lannate may be applied for aphid control in late season; e.g., Thiodan
on May 7 and Lannate on May 21.
4An additional application of Lannate may be necessary on June 15 for aphid control.
5This rate is equivalent to a 0.125% spray at 25 gallons per acre.
_ .__ ___ ._ __ ; ___i