Canada will once again implement additional temporary import requirements for U.S. origin romaine lettuce for Fall 2023. The additional requirements will be in effect from September 28, 2023 to December 20, 2023. As with previous years’ requirements, Canada will require imported romaine lettuce and/or salad mixes containing romaine lettuce originating from the Salinas Valley counties of Santa Clara, Santa Cruz, Monterey, or …

Maeli Melotto and her team at the UC Davis Department of Plant Sciences are looking for strains of lettuce that are genetically stronger at resisting bacteria that can make people sick. Their work has led to the identification of a gene that could play a role in the plant’s susceptibility to E. coli, a bacterium that causes potentially lethal intestinal illness. …

The FDA is releasing the findings of a sampling assignment for which FDA collected and tested romaine lettuce from commercial coolers in Yuma County, Arizona during February and March 2021. The agency tested the lettuce for Shiga toxin-producing Escherichia coli (STEC), specifically enterohemorrhagic Escherichia coli (EHEC), and Salmonella spp. This assignment was part of the FDA’s ongoing surveillance following multistate E. coli O157:H7 outbreaks of foodborne illness in recent years …

The U.S. Food and Drug Administration will be collecting and testing samples of lettuce grown in California’s Salinas Valley from local commercial coolers from May through November 2021. The agency will test the samples for Shiga toxin-producing Escherichia coli (STEC), including E. coli O157:H7, and Salmonella spp. as part of ongoing surveillance efforts following reoccurring outbreaks linked to this region, including most recently in the fall of …

A recent report of viral disease on lettuce from our neighbor (Yuma, Arizona) caught our attention since this is highly relevant to our production system (please find information on the first link below). The name of the virus is “Impatient Necrotic Sport Virus” (INSV), which is a tospovirus, similar to the virus that attacks tomato to cause tomato spotted wilt …

Effective control of western flower thrips (WFT) to prevent cosmetic scarring and contamination is important in spring lettuce crops, and now that INSV has been found infecting plants in Yuma lettuce, management becomes even more important.  For most of the growing season, WFT numbers have been below average based on sticky trap counts, field reports and population densities here at YAC. …

California leads the nation in vegetable production, accounting for 39% of the U.S. vegetable acreage. The value of California’s 2020 utilized vegetable production dropped 0.9% to $7.68 billion compared to 2019’s value of $7.74 billion according to the USDA National Agricultural Statistics Service, Pacific Regional Field Office. Despite the decrease in state’s overall total value of utilized production, crops showing an increase …

Despite the tremendous need, there are currently no preemergence herbicides that are organic-compliant. Steam injected into the soil such that the soil temperatures reach >140°F for 15-20 minutes will kill weed seed in the soil. The effect of this reduction in the seedbank viability results weed control in the treated area that persists for several weeks or months, similar to …

In 2020 the incidence of Pythium wilt (caused by Pythium uncinulatum) of lettuce has increased in severity and in the number of affected fields. Pythium infections in lettuce fields have been observed frequently, but not always, occurring with INSV infection. As a result, there has been confusion distinguishing between these two diseases and the role of each of them in causing …

Weed control in lettuce and other crops is a key issue this time of year. Purslane is particularly problematic and is adapted to warm conditions and can grow very rapidly especially during July and August. At times growers and PCA’s are disappointed with the efficacy of Kerb on this weed. Kerb is effective in controlling purslane but it is readily …