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

August 3, 1998

PD36-98

Mediterranean Fruit Fly (Medfly)

San Diego County

El Cajon

Five male Medflies were found on July 30, 1998, by San Diego County Department of Agriculture trapper Sulpicio Agnes Jr. in a Jackson/trimedlure trap. The trap was placed in an apricot tree along Camino de la Costa. An unmated female Medfly was trapped three days later at a site about a block away along Beaumont Avenue. The fly was found by CDFA inspector Emelina Liscano in a CHAMP/yellow panel trap placed in a nectarine tree.

When the first Medflies were trapped, the trap density was 10 Jackson/trimedlure and 5 McPhail traps per square mile.

In response, CDFA and San Diego County have increased the trap density to 100 CHAMP/yellow panel traps and 25 McPhail traps per square mile in the core square mile area around the finds. The trap density in the first buffer of eight square miles is 50 CHAMP/yellow panel traps per square mile. The trap density ouside the first buffer is a 25-20-10 array of Jackson/trimedlure traps.

In addition to increased trapping, CDFA has initiated an eradication program in a ten-square-mile area around the finds. Ground treatments of malathion/bait spray of all hosts within 200 meters has been initiated. Also, sterile release of Medflies (SIT) in a ten-square-mile area around the finds is scheduled to begin Friday, August 7, 1998.

CDFA Insect Biosystematist Kevin Hoffman determined that the male Medflies were sexually mature and the female fly was unmated and sexually mature.

SUMMARY - 1998 MEDITERRANEAN FRUIT FLY FINDS
County	Adults Trapped	Date Last Adult Trapped	Larval Properties
Marin	1	07/14/1998	0
Orange	1	07/27/1998	0
San Diego	6	08/02/1998	0
Totals	8		0

Prepared by: John Pozzi