Compsns for increasing fruit yields - contg auxins, gibberellins and phenyl-urea derivs

摘要

Compsns for increasing fruit yields contain (a) an auxin, (b) a gibberellin, and (c) are deriv. of formula R1-NHCONHR2 (where R1 is H, an opt. substd. hydrocarbon radical or an opt. substd. heterocyclic gp.; R2 is opt. substd. phenyl). Application of the compsns. to apples and drupes during or after blossoming increases fruit setting, reduces fruit drop, increases fruit size, and even induces parthenocarpy in unpollonated blossom. Component (a) is pref. 1-naphthylacetic acid, 2-naphthyloxyacetic acid or a salt or ester thereof, or a chlorinated phenoxyalkanoic or benzoic acid or a salt or ester thereof. Component (b) is pref. gibberellin A3, A4 or A7. Component (C) is pref. a urea deriv. in which R1 is opt. substd. phenyl or heterocyclyl, and is esp. diphenylurea. The wt. ratio of (c) to (b) is pref. 0.5-20:1 (esp. 5-20:1) and the wt. ratio of (a) to (b) is pref. 1:100-10:1 (esp. 1:10-5:1). The prefd. compsns. are eq. spray washes contg. 10-250 ppm (a), 10-500 ppm (b) and 10-100 ppm (c).