Abstract
SummaryOf seven chemicals sprayed onto apple flowers before flowering or at petal-fall stage one fungicide (triadimefon) increased fruit set, and one insecticide (chlorpyriphos) and the growth regulator (paclobutrazol) decreased it. These three chemicals sprayed at green-cluster stage also reduced eventual leaf size. Later sprays of chlorphyriphos and paclobutrazol sometimes reduced, and gamma-HCH sometimes increased, bourse shoot growth.
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