Abstract
Abstract Pik-Off (PO), a Ciba-Geigy Corp. product, has been field evaluated under an Environmental Protection Agency (EPA) experimental permit. Although PO does not usually produce as good abscission as some other chemicals, it appears satisfactory for many uses. From a cost and residue standpoint, PO appears to be in an advantageous position, and it is compatible with the ‘Valencia’ cultivar (Citrus sinensis (L.) Osbeck). PO should not be used with surfactants. Its effect is decreased by rain (within 24 hours of application) and low temperatures. PO is restricted by label as to total quantity which can be applied per ha. However, results of a series of volume versus concentration field tests showed that increased amounts of material per ha substantially improved abscission performance, particularly on larger trees.
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