Preventing young trees from psyllids and infection with CLas through use of protective netting

Preventing young trees from psyllids and infection with CLas through use of protective netting

Report Date: 03/08/2019
Project: 18-032C   Year: 2019
Category: ACP Vector
Author: Fernando Alferez
Sponsor: Citrus Research and Development Foundation

During this initial 4-month period of the Project, spanning from December 1st 2018 to March, we have followed the chronology developed in our proposal. Our Project has 4 main objectives: Objective 1. Assessing tree growth and absence of psyllids and HLB disease symptoms (including CLas bacteria titer) under protective covering. Objective 2. Assessment of alternative netting approaches involved in �targeted�, �alternated� or �patterned� setup of IPC in groves for more cost-effective protection. Objective 3. Monitoring the transition from vegetative to reproductive stage in the covered trees as compared to the uncovered. Objective 4. Comparing IPC with CUPS-like systems. Objective 1: We assessed the trees (Valencia on Swingle) planted in our pilot study 14 months ago for HLB . Whereas 1/3 of the uncovered trees in the trial are already positive for HLB, all trees covered with IPC have tested negative. In addition we are quantifying leaf drop and comparing leaf drop in both treatments. We are now in the process of planting� trees of the varieties �Tango�, �SugarBelle� and �US Early Pride� with our collaborators in Polk County, as described in the proposal. Objective 2: This objective will start later this spring in both SWFREC grove and in our Polk County locations. Objective 3: The trial for this objective starts this month in Polk county and has started already in our grove at SWFREC. We have seen an significant advancement in flushing timing in IPC-covered trees. We have not seen any differences in blooming rate or intensity in IPC trees as compared to uncovered trees. We are assessing and rating the type of flushes each tree individually bears. Objective 4: We are currently planting 100 trees from Tango�, �SugarBelle� and �US Early Pride� in our CUPS facility, after trellis installation. As expected, a Ms student, Susmita Gaire, has joined the Project and is performing part of this work for her Masters degree. Results from this Project have been already presented at the Citrus Show in Fort Pierce this past January, and an update will be presented in Riverside at the IRCHLB meeting later this month.�


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