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

January 4, 1999

PD01-99

Olive Fruit Fly (OLFF)

Between December 24 and December 31, 1998, ninety-nine (99) OLFF were trapped in Los Angeles and Orange Counties.

Los Angeles County

Ninety- eight OLFF were trapped December 24-30, 1998, in Los Angeles County. All of the finds are within the Westwood/West Los Angeles OLFF treatment area. Two of the OLFF were detected on new properties.

West Los Angeles / Westwood

New Trap Location

Holman Avenue - December 29 - one female OLFF found in a McPhail trap placed in an olive tree.

Selby Avenue - December 30 - one sexually mature male and one sexually immature, unmated female. Both found in a McPhail trap placed in an olive tree.

Previous Trap Location

Eastborne Street - December 29 - three OLFF were found in a McPhail and CHAMP trap placed in an olive tree.

Holman Avenue - December 29 - one male was found in a McPhail trap placed in an olive tree.

Pelham Avenue - December 30 - one sexually mature male and one sexually immature, unmated female were found in a CHAMP trap placed in an olive tree.

Santa Monica Blvd - December 29 - thirty-five females and forty-eight males were found in McPhail and CHAMP traps.

Selby Avenue - December 30 - four sexually mature males, one sexually mature, mated female, and one sexually immature, unmated female were found in McPhail and CHAMP traps.

Orange County

Rossmoor

New Trap Location

One male OLFF was detected on December 24th in a McPhail trap placed in a pineapple guava along Martha Ann Drive. The find is approximately eight miles from the first OLFF trapped on December 2 in Orange County (PD110-98).

CDFA trappers Arcadio Diaz and Ernesto Ronquillo are credited with finding the OLFF.

CDFA Insect Biosystematist Kevin Hoffman made the determinations.

Olive fruit fly does not respond to cuelure or methyl eugenol. CDFA has increase the McPhail trap density, as needed, to 80 traps per square mile in the core square mile and 40 McPhail traps per square mile in the eight adjacent square miles. In addition, AM panel/CHAMP traps have been deployed at the same density as the McPhail traps within the delimitation trapping area. CDFA is continuing a larval survey in the area of recent finds.

Since October 19, 1998, a total of 166 olive fruit flies have been trapped in California. One hundred and sixty-two (162) OLFF have been trapped in the Westwood/Palms area of Los Angeles and larvae have been found on nine properties. In response, CDFA has initiated ground malathion bait to all olive trees within 200 meters of these finds. Also, two OLFF have been trapped at separate sites in Manhattan Beach and Inglewood areas of Los Angeles. CDFA has increased trapping according to protocol around these finds.

In addition to Los Angeles County, two OLFF has been trapped in Garden Grove and Rossmor, Orange County and CDFA has increased trapping according to protocol around these finds.

SUMMARY - 1998 OLIVE FRUIT FLY FINDS
County	Adults Trapped	Date Last Adult Trapped	Larval Properties
Los Angeles	164	12/30/1998	9
Orange	2	12/24/1998	0
Totals	166		9

Prepared by: John Pozzi