Effect of low temperature between fractionated-dose irradiation doses on mating of the West Indian sweetpotato weevil, <Emphasis Type="Italic">Euscepes postfasciatus</Emphasis> (Coleoptera: Curculionidae) |
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Authors: | Norikuni Kumano Takashi Kuriwada Keiko Shiromoto Dai Haraguchi |
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Institution: | 1.Okinawa Prefectural Plant Protection Center,Naha,Japan;2.Ryukyu Sankei Co. Ltd.,Naha,Japan |
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Abstract: | The effectiveness of the sterile insect technique (SIT) depends on the ability of released sterile males to mate with and
inseminate wild females, but the use of gamma radiation to induce sterility negatively affects both somatic and reproductive
cells of the sterilized insects. Recently, the effectiveness of fractionated-dose irradiation (FI), in which a sterilizing
dose is delivered over time in a series of small irradiations, has been demonstrated in the West Indian sweetpotato weevil
Euscepes postfasciatus (Fairmaire). FI improves male mating propensity compared with acute irradiation; however, this renewed technique takes a
long time (72 h in the present circumstances) compared with the traditional technique (approximately 20 min) using single-dose
irradiation (150 Gy) to fully sterilize this weevil. The extra time required by FI might negatively affect the quality of
released sterile males, because weevils expend limited resources, such as metabolic energy or sperm, in mating freely in this
period. We evaluated whether the temporal storage of weevils at low temperature (5°C and 15°C) improves the quality of sterile
males compared with the normal condition (25°C). Temporal storage at low temperature in FI improves male mating propensity.
For example, the sexually active phase of males exposed to 15°C was 18 days at least after irradiation. This period was longer
than that of normal males (14 days). Meanwhile, this manner delayed male reproductive development and temporarily reduced
mating competitiveness ability. If considering the long active phase of sterile males exposed to 15°C, these disadvantage
would be cancelled out. We discuss the advantage of FI with temporal storage at low temperature in the eradication program
using SIT for E. postfasciatus. |
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