EVALUATION OF CONTROL OF EUROPEAN CORN BORER, OSTRINIA NUBILALIS (HUBNER), BY X-RAY INDUCED STERILITY

Journal Article · Wed Aug 01 04:00:00 EDT 1962 · Dissertation Abstr.

OSTI ID:4748031

Walker, J R

Records on emergence from four groups of untreated European corn borer larvae, involving 11560 invividuals, showed that on the first day of emergence 50% of the moths were females. After the first day of emergence, males outnumbered females with a gradual shift to more females during the latter part of the emergence period. The sex ratio of the moths studied was approximately 57% males and 43% females. Mating studies indicated that corn borer moths had a poor to moderate fecundity level. In cages containing eight males and eight females only 67.7% of the females mated. Also only 58-88% of the eggs deposited by females in the control matings hatched. Exposure of 1day old nmale moths to 32000r resulted in 1% egg hatch when they were mated to untreated females. The irradiated males competed equally with untreated males for virgin females. A ratio of eight irradiated males to four untreated males to eight untreated females resulted in 39.4% hatch of the deposited eggs. The survival of the irradiated males compared favorably with untreated males under laboratory conditions. Exposure of pupae to x rays resulted in a reduction in the percent of egg hatch as the dose was increased. Female pupae were more susceptible to the eIfects of irradiation than male pupae. The percent of egg hatch varied with the age of the pupae at the time of treatment, younger pupae been more susceptible to irradiation than older pupae.

• Research Organization: Iowa State Univ. of Science and Tech., Ames
• NSA Number: NSA-16-033349
• OSTI ID: 4748031
• Journal Information: Dissertation Abstr., Journal Name: Dissertation Abstr. Vol. Vol: 23
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

EFFICIENCY
INDUSTRIAL APPLICATIONS OF ISOTOPES AND RADIATIONS
INSECTS
IRRADIATION
SEX
X RADIATION