05/21/98 - Bradenton and Umatilla Mediterranean Fruit Fly Update - DACS

Provided by Dr. Marion Fuller
Florida Department of Agriculture and Consumer Services (FDACS)

Report Dated 05/20/98

Bradenton

Medfly count is now 373 with most detections in the treated area. Two flies were picked up outside the core area, one about 200 meters west of the western boundary, one about 3/4 mile east of the eastern boundary.

Ground bait treatment was essentially completed over the weekend in the 2 square mile area in the center of the "core". As of Monday, only 10 property owners had refused access. More problematic has been the folks who are not at home. These residences are not treated on initial contact - an informational packet is left with them. They are visited again and permission sought. This is resource intensive, and efforts are underway to obtain permission for subsequent treatments in the event that no one is home at the time an applicator is in their area. Because ground bait applications are less effective than aerial application (80% is one figure I've heard), it is particularly critical to get as many properties treated as quickly as possible.

Treatments are continuing in the core area in response to the new finds. In addition, ground bait treatments were applied to host materials within a 200 meter radius of the two finds outside the core area.

Environmental Monitoring: - No report

Health Monitoring - Three informational calls have come into the Manatee County Health Department (as of Monday). No health related concerns have been reported.

A member of SCRAM (Citizens Against Malathion) is working with the Department to organize volunteers to assist with fruit pickup outside the treatment area.

Umatilla

The fly count is 1314 (I was off by one last time) with the two latest flies found within the treatment area. These finds will not impact the size of the treatment area.

There are currently 3,406 traps deployed in the regulated area: 2665 Jackson traps, 485 yellow panel traps, 206 McPhails, and 50 IPTs. Ground crews continue to apply to host materials in the buffer zones around sensitive sites.

Regulatory personnel have conducted 445 inspections and signed 71 compliance agreements. These activities relate to fruit movement in and out of the quarantine (regulated) area.

Final DNA results are in, and the more refined DNA analysis remains consistent with the flies detected in the Tampa area last year.

The next aerial treatment is scheduled for Saturday morning. Treatment days have been moved to Saturday to give us Sunday if environmental conditions aren't favorable. We want to avoid weekdays since we prefer not to go up until after 9:00 am on weekdays. While that helps miss children at bus stops or unloading at school, it is also the time when wind speeds are more likely to start increasing, and it gives a shorter window for application while most people are indoors.

Environmental Monitoring - The following are results from water samples taken from monitored lakes, after the second aerial bait application.

Yale 0.1 - 0.3 ppb (between MDL of 0.1 ppb and PQL of 0.3 ppb)
Crescent 1.9 ppb
Bay(5/11) 1.6 ppb
Bay (5/12) 1.2 ppb
Enola BDL
Geneva 0.3 ppb
Palm 0.3 ppb
East Lake 0.3 ppb

NOTE: Two samples were obtained from Bay Lake, since it had a higher post application result than the others we've been monitoring, after the first application. These results are comparable to those of the other areas monitored. GPS spray patterns indicate better attainment of desired buffer zones at this lake also.

Bioassessments -Samples were taken after the second application from Lakes Gibson, South Twin, Umatilla, East, and Crescent. Gross observation indicate fish swimming, damsel flies flying, and the samples themselves alive with macroinvertebrates. Usually, this type of sampling is done by fixing the sample with formalin, then looking at numbers and diversity of species present. Here, the counts are being done "live" so as not to assume all creatures picked up were live. (I believe this was also done with the pre-application samples, but need to confirm it). Again, the object is to determine if malathion is affecting the numbers/diversity of the biota.

Laboratory results are expected by the end of this week, or early next week.

The Department of Environmental Protection will also do a third round of sampling during the week of July 6, after completion of sprays, to see what the status is at that point.

Health Monitoring - Lake County Deptartment of Health received another call concerning possible health effects. This brings the total to three. This caller is an elderly individual with a history of respiratory problems, who is concerned about exacerbation of her condition. The Department of Health is following up.

Thanks again to the agencies/individuals who are providing me with their information to include in this report. It makes my job easier, and benefits us all!

FDACS - Division of Plant Industy: Mediterranean fruit fly information
USDA APHIS: Mediterranean fruit fly information
UF/IFAS Fact Sheet ENY-809: The Mediterranean Fruit Fly
UF/IFAS Fact Sheet ENY-626: Mediterranean Fruit Fly: What Floridians Need To Know


The UF/IFAS Pest Alert WWW site is at: http://pestalert.ifas.ufl.edu/