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

November 12, 1998

PD89-98

Mediterranean Fruit Fly (Medfly)

Riverside County

Lake Elsinore

One male Medfly was found on November 9, 1998, by Riverside County trapper Laura Doughty in a Jackson/trimedlure trap along Stoneman Steet. The trap had been placed in a apple tree and the site is near previous Medfly finds (PD88-98).

Riverside County Department of Agriculture trapper and CDFA I.D. sorter Laura Doughty and Dorinda Singer are credited with finding the Medfly.

Since October 22, 1998, seventy-three (73) Medflies have been trapped at 31 separate sites in the Lake Elsinore area. Larvae have been found on four properties. CDFA initiated ground treatment with malathion bait spray to find properties and adjacents. Ground treatment of all properties within 200 meters of the finds began on October 31 and will continued around these new finds. 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	73	11/09/1998	4
San Diego	7	08/02/1998	0
Totals	92		5

Prepared by: John Pozzi