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

November 2, 1998

PD80-98

Mediterranean Fruit Fly (Medfly)

Riverside County

Lake Elsinore

Forty six (46) Medflies were trapped from October 31 and November 1, 1998, at 15 sites within the Lake Elsinore Mediterranean fruit fly eradication zone. In addition, Medfly larvae were found at two sites. All of the finds were near the sites that two Medflies were previously trapped (PD78-98).

New Trap Location

Ainsworth Place - October 31 - 4 males found a CHAMP trap placed in a fig.

- November 1 - 2 mated females found a McPhail trap placed in a kumquat.

- November 1 - 3 males found a CHAMP trap placed in a fig.

Ainsworth Place - October 30 - 2 males found in a Jackson trap placed in an orange.

Ainsworth Place - October 31 - 4 males found a CHAMP trap placed in an orange.

- November 1 - 1 male found a CHAMP trap placed in a orange.

Ainsworth Place - October 30 - 2 males found a Jackson trap placed in a lemon.

- October 30 - 1 male found a McPhail trap placed in a lemon.

- October 31 - 2 mated females found a McPhail trap placed in an orange.

Ainsworth Place - October 31 - 4 males found a CHAMP trap placed in an apricot.

- November 1 - 2 male found a CHAMP trap placed in a apricot.

Alvarado Street - October 30 - 1 female found a McPhail trap placed in a peach.

- October 31 - 1 male and 2 mated females found a McPhail trap placed in a peach.

-November 1 - 1 mated female found a McPhail trap placed in a peach.

Amorose Street - October 31 - 1 male found a CHAMP trap placed in a lemon.

- November 1 - 2 males found a CHAMP trap placed in a lemon.

Amorose Street - November 1 - 1 male found in a CHAMP trap placed in a persimmon.

Amorose Street - October 31 - 1 male found in a CHAMP trap placed in a orange.

Amorose Street - October 31 - 1 mated female found in a McPhail trap placed in a persimmon.

Cleveland Court - November 1 - 1 male found in a CHAMP trap placed in a lemon.

Cobblestone Lane - October 30 - 2 males found a Jackson trap placed in an apple.

- November 1 - 1 mated female found a McPhail trap placed in a fig.

Machado Street - October 31 - 1 male found in a CHAMP trap placed in a orange.

Marcoleso Lane - November 1 - 1 male found in a CHAMP trap placed in a orange.

Tiller Lane - October 30 - 1 male found a Jackson trap placed in a pomegranate.

- November 1 - 1 male found a CHAMP trap placed in a pomegranate.

New Larval Location

Ainsworth Place - October 31 - one third and three second instar larvae found in a apple.

De La Lama Street - October 31 - one second and five third instar found in an Asian pear.

Since October 22, 1998, fifty-one (51) Medflies have been trapped at 20 separate sites in the Lake Elsinore area. Larvae have been found on two 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. Soil drench treatments with diazinon are planned for the larval properties.

The trap densities in the core square miles around the finds is 100 CHAMP/yellow panel traps and 25 McPhail traps per square mile. The trap density in the first buffer of eight square miles is 50 CHAMP/yellow panel traps per square mile, with a 25-20-10 array of CHAMP/yellow panel traps outside the first buffer.

Sterile Medfly releases (SIT) is scheduled to begin November 6, 1998.

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	51	11/01/1998	2
San Diego	7	08/02/1998	0
Totals	70		3

Prepared by: John Pozzi