Prohexadione-calcium Decreases Fall Runners and Advances Branch Crowns of `Chandler' Strawberry in a Cold-climate Annual Production System

Abstract

<jats:p>Balancing vegetative growth with fruiting is a primary concern in strawberry (<jats:italic>Fragaria</jats:italic> ×<jats:italic>ananassa</jats:italic> Duch.) production. Where nursery plant selection and preconditioning are inadequate for runner control, additional approaches are needed. The gibberellin biosynthesis inhibitor prohexadione-Ca (commercial formulation Apogee) was tested over two seasons for suppressing fall runners of `Chandler' plug plants in a cold-climate annual hill production system. Prohexadione-Ca was applied as a foliar spray at active ingredient concentrations ranging from 60 to 480 mg·L<jats:sup>-1</jats:sup>, either as a single application 1 week after planting, or repeated at 3-week intervals. The lowest rate resulted in inadequate runner control, with some runners producing malformed daughter plants. Higher rates resulted in 57% to 93% reductions in fall runner numbers, with a concomitant increase in fall branch crown formation. There were no effects of the prohexadione-Ca treatments on plant morphology the following spring, and no adverse effects on fruit characteristics or yield. Chemical names used: prohexadione-calcium, calcium 3-oxido-4-propionyl-5-oxo-3-cyclohexene-carboxylate.</jats:p>

Characterisation of the DELLA subfamily in apple (Malus x domestica Borkh.)

“…For example, exogenous GA is used to control flowering time and increase fruit size, and inhibitors of GA biosynthesis are applied to restrict vegetative growth (Black 2004;Greene 1989Greene , 1999. Apple (Malus x domestica Borkh.)…”

Low Tunnel and Cultivar Effects on Day-neutral Strawberry Yield and Characteristics in New Hampshire

“…The gibberellic acid synthesis inhibitor prohexadionecalcium (commonly known as Apogee; BASF Corp., Research Triangle Park, NC) has been approved in Canada to assist with runner management (BASF Canada, Mississauga, ON, Canada). However, despite trials in Maryland, Massachusetts, and Maine showing that applications can significantly reduce runner initiation and even improve fruit yields in strawberry (Black, 2004;Green and Schloemann, 2010;Handley et al, 2009), the product has not been approved in the United States. Thus, other tools are needed.…”

Proheksadioni-kalsium lisää mansikan satopotentiaalia avomaalla

“…Kasvihormonien roolia mansikan hankasilmujen erilaistumissa on selvitetty muutamissa tutkimuksissa. Gibberelliinin on havaittu edistävän mansikan rönsynmuodostusta (Thompson & Guttridge 1959) ja gibberelliinisynteesi-inhibiittorit lisäävät juurakon haaroittumista ja vähentävät rönsynkasvua (Nishizawa 1993, Black 2004. Proheksadioni-kalsium (ProCa) on gibberelliinisynteesiinhibiittori, joka estää aktiivisen gibberelliinin muodostumista väliaikaisesti (Griggs ym.…”

“…2004. ProCaa on tutkittu jonkin verran myös mansikan kasvunsäädössä Yhdysvalloissa ja Kanadassa (Black 2004, Reekie & Hicklenton 2002.…”

“…Voimakas rönsyntuotanto keskikesällä vähentää mansikan satopotentiaalia Suomen oloissa, koska se kuluttaa resursseja juurakoiden kasvulta ja kukintojen muodostumiselta. ProCan tiedetään vähentävän rönsynmuodostusta mansikalla (Black 2004, Reekie & Hicklenton 2002. Yhdysvalloissa tehdyssä tutkimuksessa vähentyneen rönsynmuodostuksen ei kuitenkaan havaittu vaikuttavan seuraavan vuoden satoon (Black 2004).…”