Compsn. for defoliating cotton plants - contain phenyl-sulphonyl- or hetero-aryl-sulphonyl-urea and opto n-phenyl-tetra:hydro-phthalimide synergist

摘要

Compsns. for defoliating cotton plants contain a substd. sulphonylurea (I) or alkali metal or alkaline earth metal salt and opt. an N-phenyl-tetrahydrophthalimide synergist (II). A = (2-Cl-, 2-carbomethoxy-, 2-carboethoxy, 2-(2-chloroethoxy)-or 2-(2-methoxyethoy))-phenyl, 2-carbomethoxybenzyl, 3-dimethyl-carbamoyl-2-pyridyl, 1-methyl-4-methoxycarbonyl-5-pyrazolyl or 2-carbomethoxy-3-thienyl; R2 = H or methyl; R3 = methyl, methoxy, difluoromethoxy, Cl or methylamino; R4 = methyl, methoxy, difluoromethoxy or ethoxy; Z = CH or N; R5 = H, F or Cl; R6 = -CH=C(R7)-CO-OR8, OR11 or (i); R7 = H, Cl, Br, CN or 1-6C alkyl; R8 = H, 1-8C alkyl, 1-8C alkenyl, 3-4C alkynyl, 1-8C akloxyalkyl, 1-8C alkylthioalkyl, phenyl-1-8C alkyl or 3-6C cycloalkyl; R9 = H or 1-4C alkyl opt. substd. by OH, halogen, CN, SH, 1-4C alkoxy, 1-4C alkylthio, 1-4C alkylcarbonyloxy or 1-4C alkoxycarbonyl-1-4C alkylthio; R10 = H or 1-3C alkyl; R11 = 1-4C alkyl, 3-4C alkenyl, 3-4C alkynyl, 1-4C alkylcarbonyl, 1-4C alkoxycarboinyl-1-4C alkyl, tetrahydrofurfuryl, dihydropyranylmethyl, dihydrothio-pyranylmethyl, tetrahydropyranylmethyl or tetrahydrothiopyranyl-methyl; X = O or S; n = 0 or 1. USE/ADVANTAGE - The new compsns., which are applied prior to reaping, are active in low amts., e.g. 0.1g-3 kg/ha. They effectively prevent the appearance of new shoots and give higher quality fibre. The compsns. are better defoliants than compsns. contg. the cpds. described in eg DE3413565 and US4127405.