Lygus Continued from Page 13
removal typically costs $2,700anacreover the course of the season. That trails only harvest in labor costs. Thereareother promisingnewanswers to the persistent problemof lygus-feeding damage to strawberries. It is most severe inareas of theCentral Coast region, where berry harvest extends into late spring and early summer, when pest populations reach their peak. Anexperimental insecticide that should be registered in thenext twoor three years has shown intrials theability tocontrol the pest far longer thanexistingmaterials that suffer fromresistance issues. The pest has developedwidespread re- sistance to malathion and other organo- phosphate insecticides. While the bug vacuum shows great promise for integrated pest manage- ment or organic systems, Bolda said he has had success in his most recent trials to replace materials that suffer from re- sistance problems. “I finally have a product that really works,” he said. Bolda compared the experimental material—identified by Syngenta as ISM555—withthe larvicideCormoranand the pyrethroidMustangMaxx in trials at a Watsonville berry farm in 2021. Therewas a significant difference in the
This bug vacuum, above, can remove lygus bugs, upper right, from four rows of strawberries in a single pass. It was developed with help from pro- duction manager John Lin, lower right, and fellow researchers at the Strawberry Center at California Polytechnic State University, San Luis Obispo.
residual effectiveness of the new experi- mental insecticide, Bolda said. “Twenty days after application, all of the materials are looking fine,” he said. “Byproviding twomonths of suppression, ISM555 represents a paradigm shift in ly- gus management. It looks like one or two applications for the season.” The numbered material also showed some effectiveness on thrips, which feed
on strawberry flowers before they have a chance to set fruit. “Workwill continueon thishighlyeffec- tive insecticide,” Bolda said. Headdedthat Syngenta isworking toget thematerial registered by 2025. Inadditiontovacuumsandinsecticides, weedcontrol isanimportantmanagement tool, especially in thewinter, toprevent ly- gus populations frombuilding up before the next season. Many weeds commonly found near Central Coast fields host lygus, includ- ing California poppy, groundsel, filaree,
lambsquarters, little mallow, lupines and mustards. Inadditiontoweeds, second-year straw- berries also host lygus. These survivors have already demonstrated the ability to resist control strategies. A parasitic wasp and a nymphal para- sitoid are two control strategies, but they are unable to keep lygus populations be- low the extremely low threshold for eco- nomic damage. (Bob Johnson is a reporter in Monterey Coun t y . He may b e c on t a c t ed a t bjohn11135@gmail.com.) of Agriculture Farm Service Agency and Natural Resource Conservation Service programs for NorthCoast farmers; walnut blight biology and management; walnut husk fly research; pesticide use laws and regulations; California walnut marketing; orchardmanagementpractices tooptimize treehealthandyield;andfall freezedamage, decision-makingand follow-up treecare. To register for the meeting, go to https://ucanr.zoom.us/webinar/register/ WN_3l5MHkZMTUOBNwbsmZTgsg.
Walnut meeting set for April The 2022 Lake County Walnut Update will beheldApril 1, 8:30a.m. to12:30p.m., as a Zoom meeting. The “room” will be open at 8 a.m.
Saving Farms Saving Profits Saving Futures
The meet ing wi l l cover status of University of California walnut-related programs in Lake County, overviewof the 2021 growing season, and 2022 outlook and concerns. Specific topics include UC Fruit and Nut Research and Information Center walnut-related content; U.S. Department
CHAPTER 12
Imagine a Better Future | Restore Your Farming Legacy Eliminate debt. Stop foreclosure. Stop repossessions. Cancel bad vendor and packing house contracts. Sell farmland with little to no capital gains tax.
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14 Ag Alert March 16, 2022
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