Scheduling ACP spring spray selection based on the Citrus Flowering Monitor System

Scheduling ACP spring spray selection based on the Citrus Flowering Monitor System

Report Date: 05/19/2016
Project: 850   Year: 2016
Category: ACP Vector
Author: L. Gene Albrigo
Sponsor: Citrus Research and Development Foundation

The evaluation of the up-graded on-line ‘Citrus Flowering Monitor System’ continued with extensive grower and extension use and in making advisories to growers. No adverse comments were received and the system worked very well in collecting data for grower advisories. The totally abnormal weather pattern this past fall and early winter, essentially no cold induction before January 1st, has made advising and deciding on flower bud enhancement and spray scheduling a large challenge for the Florida citrus industry. Although we only have one year of data, it looks like 5 to 10 % open flowers is reached about 21 to 27 days before full bloom. Therefore, open flowers for PFD invasion was about March 3 to 9 for the first wave. This was the same date for stopping psyllid sprays that were not bee friendly. From May 3 to 9 flowers with petals were available to sustain PFD innoculum. The first estimates of vegetative flush were 7 to 10 days earlier than the 5-10 % open flower date suggesting a one week window for flush spray coverage with more effective chemicals for psyllid control.


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