THE ABSORPTION, TRANSLOCATION AND BREAKDOWN OF SCHRADAN APPLIED TO LEAVES, USING 32P‐LABELLED MATERIAL

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Abstract
A study of translocation of 3aP‐labelled schradan in apples, chrysanthemums, broad and runner beans and Coleus, has shown light to be an important factor.The main direction of translocation is upwards but some schradan does travel downwards. In apples translocation takes place mainly in the phloem but some may take place in xylem particularly upwards.No major difference has been observed in the ratio translocated/absorbed for Coleus, beans and chrysanthemums but in apples this proportion is greater.The breakdown of schradan into non‐chloroform extractables varies between the plant species and is far greater in beans than in Coleus.In chrysanthemums and apples the breakdown appears similar throughout the plant whilst in beans and possibly Coleus the breakdown in the untreated sections is higher.Concentrations necessary for the kill of certain species of aphides are given.