Abstract
This is a preliminary report of work done in 1923 by the Ohio Experiment Station. The life history of the insect, Pyrausta nubtlalis Hubn., as it occurs in northeastern Ohio, is briefly summarized. There is one generation per year. Careful observations made in a definite area along the lake front showed an average infestation of more than one percent in Lake and Ashtabula counties in northeastern Ohio. The average for other lake counties is considerably less. The maximum infestation for the state is seventeen percent, found by Federal workers in a thirty acre field of dent corn near Toledo in Lucas County. No conclusive statement in regard to the efficiency of the clean up measures. prosecuted in Ashtabula county in the spring of 1923 can be made at this time. A study of infested stalks showed clearly that the stubble left in the field must be seriously considered in our future control measures. Native predators and parasites are almost negligible. Three weed hosts are recorded. Although the borer has increased greatly in numbers during the past season no commercial damage has been done.
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