Plant Health & Pest Prevention Services Pest Detection/Emergency Projects
DETECTION ADVISORY

November 16, 1998

PD94-98

Mediterranean Fruit Fly (Medfly)

Riverside County

Lake Elsinore

One mated female Medfly was found on November 12, 1998, in a McPhail trap along Machado Steet. The trap had been placed in a persimmon tree and the site is near previous Medfly finds (PD89-98).

Riverside County Department of Agriculture trapper and Federal I.D. sorter Laura Doughty and Kathleen Villalobos are credited with finding the Medfly.

Since October 22, 1998, seventy-four (74) Medflies have been trapped at 32 separate sites in the Lake Elsinore area. Larvae have been found on four properties. CDFA initiated ground treatment with malathion bait to all properties within 200 meters of the finds and the second application is in progress. The second soil drench treatment with diazinon to larval properties and adjacents is continuing. Sterile Medfly releases (SIT) began on
November 6, 1998.

The CHAMP/yellow panel, Jackson and McPhail traps are being removed from the SIT release area and are being replaced with Integrated Pheromone McPhail Traps (IPMT). They are being deployed at five traps per square.

A quarantine area of 180 square miles has been established.

CDFA Insect Biosystematist Kevin Hoffman made the determinations.

SUMMARY - 1998 MEDITERRANEAN FRUIT FLY FINDS
County	Adults Trapped	Date Last Adult Trapped	Larval Properties
Marin	1	07/14/1998	0
Orange	11	10/27/1998	1
Riverside	74	11/12/1998	4
San Diego	7	08/02/1998	0
Totals	93		5

Prepared by: John Pozzi