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Interaction of nematicdes and biostimulants for nematode management on cucumbers and carrots
B. WESTERDAHL (1). (1) University of California, Davis, CA, U.S.A.

Two randomized complete block field trials with five replicates were conducted to evaluate the effectiveness compared to an untreated control (p=0.05) of timing of pre-plant applications (0, 7, 14, or 21 days) of Nimitz (fluensulfone; MCW-2; ADAMA USA, Raleigh, NC); with and without multiple irrigations; and with and without the addition of a plant growth regulator (PGR; More Power; StollerUSA, Houston, TX), and soil penetrant (SP; Forte; J. R. Simplot Company, Boise, ID) for management of root-knot nematode, <i>Meloidogyne javanica</i>. The trials, one on cucumber, and one on carrots, had 16 identical treatments, and were adjacent to each other in the same field. Both crops are commonly used as indicators of nematicide effectiveness.  For carrots, marketability of roots without nematode damage is most important. In contrast, for cucumbers, fruit yield is the most important factor. Overall, for cucumbers, there appears to be an advantage to using the PGR + SP additives. For example, the 7-day pre-plant treatments with PGR + SP with and without multiple irrigations, increased yields, while the same treatments without additives did not. Overall, both with and without PGR + SP, there appears to be an advantage to longer pre-plant intervals (14 and 21 days), both with and without additional irrigations. In contrast, in carrots, we did not see an advantage of the PGR + SP treatments.

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