Flower Bud Induction Overview and Advisory

Flower Bud Induction

 

NOTICE FOR CITRUS EXTENSION AGENTS & SPECIALISTS AND GROWER NEWSLETTERS
The following information has been developed as part of the Decision Information System for Citrus

L.  Gene Albrigo, Horticulturist Emeritus
Citrus Research & Education Center, Lake Alfred, FL

 

Archives of past Flower Bud Induction Advisories

 

Flower Bud Induction Overview and Advisory
NOTICE FOR CITRUS EXTENSION AGENTS & SPECIALISTS AND GROWER NEWSLETTERS
The following information has been developed as part of the Decision Information System for Citrus

L. Gene Albrigo, Horticulturist Emeritus
Citrus Research & Education Center, Lake Alfred, FL

FLOWER BUD INDUCTION ADVISORY #6 for 2017-2018-2/1/18

Gene Albrigo, Horticulturist Emeritus, Citrus Research & Education Center, Lake Alfred, FL

This is a service to our citrus growers posted on the CREC website. The indicated Expert System on intensity and time of bloom can be accessed at the designated Web Site: http://disc.ifas.ufl.edu/bloom

If you are not familiar with the website and flower bud induction in citrus you should read the overview section in the first advisory this year.

Current status:  We have excellent induction, but continuing cold temperature conditions have slowed down flower bud development.  One warm event occurred around December 14 to 23 and another generally about January 9 to 19 depending on location.  Initiation of growth of the first flowering wave (cohort) occurred with about 630 to 800 hours of inductive temperatures and the second cohort occurred with about 800 to 1400 hours of induction depending on location.  The River had only the second timing of flowers initiated according to the Citrus Flowering Monitor System.  Overall citrus groves have very good levels of induction and most areas should have at least two waves of slightly overlapping flowering cohorts. 

Full bloom dates are now projected to be from February 18 to March 1 and a second from March 13 to 29 depending on the area.    In two severely declining Valencia groves near Lake Alfred the first wave is scattered over the trees, and this wave is mostly at the pinhead stage.  Valencia groves examined near Ft. Meade were in better condition but still showed a scattering of new flush with pinhead flowers.  A few popcorn to open flowers were observed from earlier off-season flower buds.

Off-season flowering: Open flowers and popcorn stages were observed on earlier visits to blocks from Lake Alfred to Frostproof and additional flowers are still showing up.  Valencia trees appeared to have more of this than Hamlin, but numbers were low and scattered in all cases.  I have not detected a light flush of these growing flower buds this winter that we have seen in previous winters.  Perhaps the hurricane, uneven leaf loss and uneven stresses on the trees are contributing to the less even patterns for both off-season and the first spring cohort flowering.

If you have any suggestions or questions, please contact me (albrigo@ufl.edu)