Pests Continued from Page 7
annual trend and regional informa- tion,” Hasegawa said. “All of these pests are increasing with the heat.” Data reported in the app show a close correlation between regional thrips populations and the average tempera- tures measured at weather stations in Salinas, Soledad and King City. Thrips are important largely because they transmit impatiens necrotic spot vi- rus, which causes stunting and necrosis on the inner leaves. Because there is no treatment for infected lettuce, virus management requires a complex combination of reducing thrips populations and re- moving weeds that host both thrips and INSV. While 2021 was a relative moderate year for this virus, UCCE researchers es- timated that INSV caused $100 million in damage to Monterey County lettuce in 2020. This year, the disease has again been relatively widespread, they said. Different types of aphids can infest Central Coast region lettuce. They in- clude foxglove, green peach, lettuce and potato aphids. The monitoring data reported in the new pest app show that aphids, too, have increased along with warmer temperatures in all three regions of the Salinas Valley. While aphids carry and transmit many viral diseases, the lettuce aphid can be particularly troublesome because it
They said the app can be used “to quickly view current thrips, diamond- back moth and aphid abundances where pest populations are increasing the fastest, and how previous years’ pest populations responded to changes in temperature.” Researchers say they hope to add new features over time for the app, which can be found online at salinaspestmap. shinyapps.io/salinas-pestmap. They are soliciting feedback from farmers on improving the product and its data pre- sentations for helping growers manage their pest-control decisions. Meanwhile, they say the information currently provided by the application is useful for knowing the level of insect pest pressure throughout the Salinas Valley and in each region from year to year—rather than deciding whether an application would make sense in a par- ticular field. After opening the app, users can choose to access the latest informa- tion on thrips, aphids or diamondback moths. Another option on the front page of the app is to navigate to a sec- tion with three years of historical data tracking the pests as the temperature rises or falls. All three of these pests have increased with the warmer growing seasons in re- cent years. “The industry tells us they can use
A trap in a broccoli field, above, captures and photo- graphs diamondback moths. At right, U.S. Department of Agriculture entomologist Daniel Hasegawa monitors traps and pest populations.
Photo/University of California, Riverside
seeks refuge near the heart of the plant, where it can be shielded from insecti- cides and cause cosmetic damage. Diamondback moth larvae feed on the growing points of young cole-crop plants, frequently stunting growth of the crop.
Like the other pests, diamondback moths have increased in numbers with higher temperatures in the Salinas, Soledad and King City areas. (Bob Johnson is a reporter in Monterey County. He may be contacted at bjohn11135@gmail.com.)
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The U.S. Department of Agriculture Agricultural Marketing Service has signed an agreement to provide $23 million in funds to purchase locally sourced foods for California school meal programs. “This cooperative agreement sup- porting California schools is anoth- er example of how USDA is working to build a more resilient food system rooted in local and regional produc- tion,” said USDA Under Secretary for
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The California Department of Education will use the money to pur- chase and distribute foods through the Local Food for Schools Cooperative Agreement Program. The purchases are intended to im- prove child nutrition and build rela- tionships between schools and farmers, USDA said.
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amz_r1_22_K142_4,75x6_Zoll_4c_ZA-TS_en_us.indd 1 8 Ag Alert November 2, 2022
22.08.22 10:42
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