Pest Detection Program

This program provides the second line of defense (behind pest exclusion) against exotic pests through the early detection of new introductions before they become widely established.  This early pest detection is accomplished through visual survey and the use of detection traps.  Pest detection also supports pest free status required by other states and foreign countries which receive Merced County product.

Visual survey is conducted at high risk locations in Merced County which include: orchards and apiary yards which receive bees from locations suspected of being infested with exotic weeds and Red Imported Fire Ants; roadside rights-of-way for weed infestations; roadside rest area for weed, insect and disease infestations; and crop production areas for new infestations of special concern to the State.

The Agricultural Commissioner conducts pest detection trapping throughout the County for: Mediterranean Fruit Fly, Oriental Fruit Fly, Melon Fly, Mexican Fruit Fly, Japanese Beetle, Gypsy Moth, Light Brown Apple Moth, Sweet Potato Weevil, Khapra Beetle, Asian Citrus Psyllid, European Corn Borer, and European Pine Shoot Moth.  The Agricultural Commissioner also maintains pest detection traps for Glassy-Winged Sharpshooter, which is technically considered a Pest Management program.  In addition, the California Department of Food & Ag conducts pest detection trapping in the County for Cotton Pink Bollworm (considered a Pest Eradication Program).  Merced County's goal is to detect harmful pests before they become established, so that eradication is biologically and economically feasible.  A total of 3,429 pest detection traps were placed in Merced County and inspected a total of 33,308 times during the 2019 trapping season.

2019 Pest Detection Traps Placed & Serviced
Target PestInsect HostsTraps PlacedServicing
Asian Citrus PysllidCitrus6207,692
European Pine Shoot MothPine Trees312
Glassy-Winged SharpshooterNurseries/Urban Areas3922,828
Light Brown Apple MothOrnamental2882,699
European Grape Vine MothGrapes89012,130
Melon Fruit FlyVegetable Gardens95976
Oriental Fruit FlyFruit Trees3201,386
European Corn BorerCorn542
Gypsy MothShade Trees107524
Japanese BeetleTurf, Rose100519
Mediterranean Fruit FlyFruit Trees3201,386
Mexican Fruit FlyFruit Trees1692,501
Sweet Potato WeevilSweet Potatoes120613

If you have found a trap in your tree and would like it removed or if you would like to offer your tree to add a trap, please call us at (209) 385-7431.

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