| Title: | "Effects of Irradiation Dose on Sperm Production, Insemination, and Male Mating Possible Period in the Sweetpotato Weevil (Coleoptera: Brentidae)" |
| Author(s): | Hiroyoshi S; Mistunaga T; Kohama T; Reddy GVP; |
| Address: | "Okinawa Prefectural Plant Protection Center, Maji, Naha, Okinawa, Japan. Okinawa Prefectural Agricultural Research Center, Makabe, Itoman, Okinawa, Japan. Kotobukiso, Nishikawacho, Itoman, Okinawa, Japan. Central Region Agricultural Research Center, National Agriculture and Food Research Organization, Kannondai, Tsukuba, Ibaraki, Japan. Department of Research Centers, Montana State University, Western Triangle Agrcultural Research Center, Conrad, MT" |
| ISSN/ISBN: | 1938-291X (Electronic) 0022-0493 (Linking) |
| Abstract: | "The sterile insect technique (SIT) has been used for the control or eradication of target insect pests. To successfully apply SIT, it is very important to clarify the effect of irradiation on male reproduction in the target pest, because their mating and spermiogenesis abilities affect the success of eradication program. The sweetpotato weevil, Cylas formicarius (Fabricius) (Coleoptera: Brentidae) is a notorious and worldwide pest of sweet potato. We investigated the effect of irradiation at five doses ranging from 0 (control) to 150 Gy on 9-d-old males. Survival rate of the control (no treatment) remained high from day 10 to 20 of adult life, whereas higher doses of irradiation reduced it, maximally by approximately 70%. Mating rates showed a similar tendency. Radiation dose neither affected sperm production nor sperm transfer at any dose, although spermiogenesis is active during the adult stage. However, radiation dose affected the lifetime total of ejaculated sperm number, likely because of fewer matings by irradiated males. These results suggest that use of a dose of 150 Gy or higher is appropriate for the final step of eradication of this weevil. At least, lower dose of irradiation may arise the inadequate sterilization, resulting in a failure of eradication program. We conclude that weekly release of sweetpotato weevil sterilized with high dose, achieving complete sterilization, could be useful for eradication program after reducing the population by male annihilation method" |
| Keywords: | "Animals Coleoptera/radiation effects Insect Control/*methods Insemination/*radiation effects Longevity/radiation effects Male *Radiation Dosage Sexual Behavior, Animal/*radiation effects Spermatogenesis/*radiation effects Weevils/*radiation effects;" |
| Notes: | "MedlineHiroyoshi, Satoshi Mistunaga, Takayuki Kohama, Tsuguo Reddy, Gadi V P eng England 2018/03/30 J Econ Entomol. 2018 May 28; 111(3):1151-1156. doi: 10.1093/jee/tox363" |
