PROSULFURON AFFECTS TRUNK SHAKER EFFICIENCY AND YIELDS OF VALENCIA ORANGES

WHITNEY, JODIE D.

Abstract


Three replicated, split plot design harvesting experiments were conducted in 1997 and 1998 to study the effects of using prosulfuron abscission chemical and a trunk shaker on the fruit removal efficiency and yield in Valencia orange trees. The 2 main plot treatments were prosulfuron and no prosulfuron, and the subplot treatments were harvesting with a trunk shaker and handpicking. Prosulfuron was sprayed at 30 ppm in 250 gal per acre on 3 dates (late April, mid May, late May) in 1997 and harvested 2 to 3 weeks post spray. Averaged over all 3 dates, prosulfuron increased mature fruit removals by the trunk shakers an average of 6 percentage points from 82 to 88%. In 1998, prosulfuron reduced the yields of the handpicked trees by 15, 34, and 6% at the 3 dates, compared to reductions of 17, 42, and 26% by the combination of prosulfuron and the trunk shaker.

Keywords


citrus harvesting; abscission

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283