DETAILED DESCRIPTION OF THE INVENTION It now has been found that synergism in the defoliation of plants is exhibited by a combination of a thiozol-urea abscission agent and an adduct produced by reaction of sulfuric acid and an amide.
The thiozol-urea abscission agents of the present invention are characterized by the general formula ##STR1## in which R.
sub.
1 and R.
sub.
2 are independently selected from the group consisting of H.
sub.
2 and C.
sub.
1 to C.
sub.
5 organic radicals, R.
sub.
3 is a C.
sub.
1 to C.
sub.
50 organic radical, preferably C.
sub.
1 to C.
sub.
20, more preferably C.
sub.
1 to C.
sub.
10, and X is an oxygen or sulfur atom.
Preferred compounds of the above general formula are those compounds in which the radical R.
sub.
1 is hydrogen or alkyl with 1 to 3 carbon atoms, such as methyl or ethyl, the radical R.
sub.
2 is hydrogen or alkyl with 1 to 4 carbon atoms, such as methyl or ethyl, the radical R.
sub.
3 is alkyl with 1 to 4 carbon atoms, such as methyl or ethyl, cycyoalkyl with 5 to 8 carbon atoms, such as cyclopentyl, cyclohexyl or methylcyclohexyl, or a phenyl, halphenyl, methylphenyl or methoxyphenyl radical, and X is oxygen or sulfur.
Particularly preferred compounds are those in which the radicals R.
sub.
2 and R.
sub.
3 jointly form with the N atom an morpholino, piperidino or pyrrolidino group.
Examples of methods for formulating such compounds are found in U.
S.
Pat.
Nos.
4,294,605, issued Oct.
13, 1981, and 3,883,547, issued May 13, 1975, which are incorporated herein in their entirety by reference.
Exemplary compounds are set forth in Table A below in which the (D) following temperature refers to a decomposition temperature.
TABLE A
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Active Substance Physical Constant
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1.
N-phenyl-N'-(1,2,3-thiadiazole-
M.
P.
217.
degree.
C.
(D)
5-yl) urea
2.
N-ethyl-N-phenyl-N'-(1,2,3-
M.
P.
200.
degree.
C.
(D)
thiadialol-5-yl) urea
3
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