Onion Maggot Control, 1996

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Abstract Onions were seeded at two commercial farms in Michigan: one in Grant (Newago Co.) on 15 May, and mother near Stockbridge (Ingham Co.) on 20 May. Single rows were planted using a vee-belt seeder with a 1 inch wide shoe. At the Stockbridge site plots *ere replicated four times and at Grant, five replications were used. A RCB design was used at both sites. Rate of seeding was 12 seeds/ft, for a total of 120 seeds per 10 ft plot. All treatments were incorporated into film coatings on the seeds except for the Lorsban treatment. All seed coat treatments included the fungicide Progro, except where noted. Starting two weeks after planting, plants in each replicate were counted and inspected weekly for onion naggot injury. Data reported are the average percent of the onion stand remaining in each treatment at harvest, calculated as the average of the number of >nions standing in each plot at harvest divided by the maximum stand achieved in the plot. Onions at the Stockbridge site were harvested on 8 Aug, and it the Grant site on 14 Aug. Percent data were arcsin square root transformed before analysis of variance. Untransformed data are reported in Table 1.