Refinement of IPM programs for the vine mealybug (Planococcus ficus) in the San Joaquin Valley table grapes

Vine mealybug has become the most significant insect pest of table grapes in the lower San Joaquin Valley. Even a small number of mealybugs can cause significant problems due to zero-tolerance policies for insects in fresh-market fruit. For the last several years many efforts have been underway to develop effective management programs for this pest. The purpose of this project was to take existing programs, which were primarily developed in Fresno County, CA raisin grape vineyards, and determine how they can be refined for improved IPM in table grapes in the lower San Joaquin Valley. This paper will discuss findings from the 2010 research season. This includes information on regional nuances in vine mealybug biology that are specific to the lower Valley, observations regarding differences in how this pest interacts in table grapes compared to wine or raisin grapes, and results from in-season insecticide trials. These trials evaluated existing products such as Lorsban, Applaud and Admire for their affects on vine mealybug and compared that to newer products such as Movento, Clutch, Venom and Platinum. The presentation will conclude with statements regarding how to utilize information from these trials while developing season-long approaches to vine mealybug management.