Researchers target a rice predator: tadpole shrimp
rials to use where tadpole shrimp have developed resistance. “Ininstanceswhere tadpoleshrimpmay be developing resistance to pyrethroids, DimlinandBelayareeffectivealternatives for growers,” advised Ian Grettenberger, UCCE entomology specialist. Seed midges have also been a more prominent arthropod pest in a number of areas in the SacramentoValley. Espino said researchers have seen seed midge damage at the Rice Experiment Station in Biggs and near Davis, and that he’s heard frompest control advisors who
have seen it too. This early-season pest feeds on the seeds and shoots of young rice seedlings and can prevent germination. Growers have seen less damage this year from armyworms, which can defo- liate the plants and are a particular con- cern during periods of stem elongation and grain formation. Armyworms became a significant problem a few years ago. These days, Espino emails trap counts fromnumerous
ByBob Johnson
“Tadpole shrimp have been a prob- lem for many years,” said Luis Espino, University of California Cooperative Extensionriceadvisor inButteandColusa counties. “In some areas, shrimp are get- tingharder tokillwithinsecticidesandthat isworrisome.Weare tryingmosquitofish.” In addition tomosquitofish, research- ers are also looking at alternative mate-
Tadpole shrimparebecomingmoredif- ficult to manage with chemicals in some rice-growing areas. Thesecrustaceanpests feedonthe roots and leaves of seedling rice and make it more difficult for the young plants to grow bymuddying thewaterswith their activity.
See PESTS, Page 14
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September 15, 2021 Ag Alert 9
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