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

FLOWER BUD INDUCTION ADVISORY #2 for 2018-2019-12/11/18

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 #2 for 2018-2019-12/11/18
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/bloomIf 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.

The on-line version has been updated so that you can shift from one FAWN weather site to another without back tracking. More FAWN sites have been added to the menu. Another added feature is that the total accumulated hours is now listed as is the projected hours to be accumulated the following week. Additionally estimates of the start of bud break for psyllid spray timing and 5-10 % open flowers to aid in managing psyllid sprays and bee movement for the bloom period will occur with the first initiation of flower bud growth.

Flower bud induction status in 2017-18 for the 2018-2019 crop -- n this El NiƱo winter, cool temperatures are accumulating and rainfall is occurring on the cold fronts as expected. Citrus locations currently have accumulated moderate inductive temperature hours, < 68 degrees F, of 430 to 600 hours from southern to northern areas, respectively. The next 7 days will have low cool temperature accumulation of 100 to 150 hours, south to north. The totals of 530 to 750 hours after this week should be 2/3rd to 3/4th of the total we would like to have for a good economic flower induction level. The following week (10 days out) still looks to be moderately cool with little chance of warm enough temperatures to stimulate bud growth.

Accumulation of cool temperatures and prevention of growth during a fall or winter warm spell is very important for good 2018-19 citrus production. The weather needs to continue to stay cool to prevent early initiation of bud growth, which can occur with daytime temperatures in the mid-80s for 7 to 10 days after accumulated cool inductive temperatures have reached 450 to 500 hours. Fortunately, we have had few continuous days of 80 degree daytime highs and 10 more days of cool weather are predicted by the weather service. Ten cool days will get us to Christmas which is a common date for a warm period to initiate flower bud growth. Continued cool weather until New Year's day would be even better.

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