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Evaluation Studies
Journal Article
Research Support, Non-U.S. Gov't
Influence of Interval Between Postharvest Lettuce Residue Management and Subsequent Seeding of Broccoli on Cabbage Maggot (Diptera: Anthomyiidae) Infestation on Broccoli.
Journal of Economic Entomology 2017 October 2
Larval stages of cabbage maggot, Delia radicum (L.) (Diptera: Anthomyiidae), attack the roots of Brassica crops and cause severe economic damage. In the Salinas Valley of California, Brassica crops are often planted after successive lettuce (Lactuca sativa L.) crops. The interval between postharvest soil incorporation of lettuce residue and the subsequent Brassica crop can be as short as 7 d, which could influence D. radicum infestation on broccoli (Brassica oleracea var. italica Plenck). In 2014 and 2015, the effect of intervals between crops (IBC) on D. radicum infestation was evaluated. The treatments were 7, 20, 33, and 48 d IBC, and NL (no lettuce), 7, 21, 36, and 49 d IBC in 2014 and 2015, respectively. Insect counts and feeding damage on broccoli was assessed during 3-6 wk after planting. Adult Delia fly captures were significantly greater at 7 d than 36-49 d IBC in both years. In both years, D. radicum eggs collected were significantly greater at 7 d than at 33 d or 36 d IBC plots. Larvae collected were significantly greater at 7 d IBC than all other treatments in 2014, but not in 2015. Similarly, severity of feeding injury was significantly greater in 7 d than 33 d or 48 d IBC in 2014, but not in 2015. In 2015, broccoli with no prior lettuce had significantly lower Delia flies and D. radicum egg densities than 7 d or 21 d IBC. The implication of these results as a cultural control tactic for D. radicum infestation is discussed.
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