Abstract
Minor modifications were made in published methods for laboratory rearing of Diabrotica undecimpunctata howardi Barber, which increased the number of adult beetles produced. Observations were made on the biology of this insect which included emergence ratio of males to females, period of oviposition, number of eggs laid, and egg fertility. Significantly more males than females emerged on the first day of emergence. Overall emergence did not vary significantly from a 1:1 sex ratio. Under the conditions of this test 59% of the eggs hatched and 66% of the larvae completed development to adults. It was found that female beetles oviposited on about 1/3 of the days available for oviposition. No Thythmic pattern was observed in oviposition. Parthenogenetic reproduction did not occur. Egg fertility of females that had been separated from males after 24 hours decreased sharply after 14 days. Apparently multiple copulations are necessary for normal fertility.
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