Interrelation of factors influencing populations of the European corn borer in Boone County, Iowa

Development of methods for the prediction of European corn borer flight and egg deposition

“…First generation Coleman (1954), Weekman (1957), and Jarvis (1961) discussed the seasonal history of the com borer in Iowa, The corn borer overwintered as mature larvae within debris from com plants of the previous growing season. Overwintering pupation began the following spring about mid-May and was completed by early June.…”

“…Most of the egg masses were deposited on the under surface of the com plant leaves. According to Jarvis (1961) the majority of first-generation eggs hatched, but some eggs were missing, some were eaten by predators, some were dried up, and some were in fertile.…”

“…Weekman (1956) reported 9 to 88 percent pupation of first-generation larvae in Boone County, Iowa, First-genera tion pupation began in mid-to late July and continued through mid-August. Jarvis (1961) reported that maximum pupation was 92% during 1957 and 1959 in Boone County. Emergence covered the period from late July to late August.…”

“…Second-generation oviposition began in late July or early August and continued until early September. Egg masses of that generation were most frequently laid on leaves near the ear, but may be found on the stalk, on the leaves, or on the ear husks, A higher percent of secondgeneration eggs than first-generation eggs were hatched according to Jarvis (1961). Cox (1955) described the feeding habits of second-generation larvae in Iowa.…”

“…During several seasons, a second-generation moth flight (third sea sonal flight) occurred in Boone County, Iowa according to Jarvis (1961).…”