RESIDUAL BEHAVIOUR OF PACLOBUTRAZOL ON AND IN FRUITS AND LEAVES OF VINE CROP.

Vine trees were treated with Paclobutrazol 25% W/V at the rate of 240 nil per feddan in the vine orchard of the Horticulture Research In­stitute, ARC, Giza on May8,1988. Residues of Paclobutrazol were deter­mined using a simple modified technique in the fruits and leaves of vine. Persistence, penetration, pre - harvest intervals , half life value and ef­fect of washing and boling after the washing process were also evaluat­ed. The data obtained indicated that Paclobutrazol is highly penetra­tive in the leaves immediately after application. Fast degradation of the compound during the first day was folloowed by a slow decomposition during the consequent intervals on and in the leaves. Paclobutrazol was of short persistence having a half life value of 14.4 hours. No residues wer detected in vine fruits and the pre - harvest intervals reached one day as determined for washed and boiled leaves.