Abstract
Abstract The addition of a 70 second superior oil to Sevin (carbaryl; 1-naphthyl-N-methyl-carbamate) sprays enhanced the thinning effect on both spur ‘Golden Delicious’ and spur ‘Starkrimson Delicious’ apples (Malus domestica Borkh.). Vydate (oxamyl; methyl N’, N’-dimethyl-N [(methylcarbamoyl)oxy]-l-thiooxamimidate) gave excellent thinning of spur ‘Golden Delicious’ without phytotoxic symptoms but increased fruit lenticel russeting. The addition of another oil ICI 411 F (17% surfactants) or 2,4,7,9-tetramethyl-5-decyn4,7 diol ethylene oxide adduct 65% by weight (Surfynol 465) to Sevin increased the thinning effect of Sevin on spur ‘Golden Delicious’. The Surfynol 465-Sevin combination also caused more russeting than most other Sevin combinations. The addition of Hydroxyethyl cellulose (HEC), Polyvinylpyrrolidone (PVP-K-30) and Sorbitol (Sorbo) did not alter the thinning effect of Sevin.
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