- 著者
- Yuki Fujiwara Tomoko Takahashi Toshie Yoshioka Fusao Nakasuji
- 出版者
- JAPANESE SOCIETY OF APPLIED ENTOMOLOGY AND ZOOLOGY
- 雑誌
- Applied Entomology and Zoology (ISSN:00036862)
- 巻号頁・発行日
- vol.37, no.1, pp.103-109, 2002 (Released:2003-04-25)
- 参考文献数
- 31
- 被引用文献数
- 49 60
Fecundity and egg size were compared in adult of the females adult diamondback moth, Plutella xylostella (Lepidoptera: Yponomeutidae) treated and untreated with sublethal doses of fenvalerate in order to understand the physiological significance of insecticidal hormoligosis. The 4th stadium larvae were treated with fenvalerate at LD25 or LD50. More eggs were laid by treated females at LD25 than untreated females, although the difference was only marginally significant (p=0.07). However, the eggs laid by treated females at LD25 and LD50 were significantly smaller in size than those laid by the control. The reproductive effort (fecundity×egg size) did not differ between treated females and the control. The treatment of a sublethal dose (LD50) against the parent affected the development and survival of offspring at immature stages of males. The hatchability of smaller eggs laid by treated females at LD25 tended to be lower than those of controls under different humidity conditions, and the difference was apparent at a humidity of 29%. The survival rate of the offspring at immature stages was lower in the treatment group (LD25) than in the control group, and development tended to be prolonged in the former group at temperatures higher than 20°C.
- 著者
- Hiroshi Jinguji Yuki Fujiwara Kazuhisa Ohtsu Moono Shin Motoko Morimoto
- 出版者
- The Japan Society of Medical Entomology and Zoology
- 雑誌
- 衛生動物 (ISSN:04247086)
- 巻号頁・発行日
- vol.72, no.3, pp.199-204, 2021-09-25 (Released:2021-09-14)
- 参考文献数
- 49
- 被引用文献数
- 1
The increase in the number of imported cases of dengue fever in Japan is of particular concern as Aedes albopictus is a vector of dengue fever. Due to the potential for insecticide resistance and the impact of insecticides on non-target species, increased attention is being paid to alternative methods of pest control. Placing salt in used tires has been recommended by the Ministry of Health, Labor and Welfare in Japan as a means of controlling mosquitoes. However, the effectiveness of salt as a larvicide against Ae. albopictus are currently unclear. This study examined the acute toxicity of sodium chloride against first and fourth larval instars of Ae. albopictus. Acute toxicity tests were conducted according to World Health Organization guidelines. The susceptibility of Ae. albopictus larvae was tested against 0.25%, 0.5%, 0.75%, 1.00%, 1.25% and 1.5% NaCl solutions. Larval mortality was correlated with an increase in NaCl concentration and exposure duration. First instar Ae. albopictus larvae were more sensitive to NaCl than fourth instar, and 72-h LC90 values for first and fourth larval instars were 0.49% and 1.01% NaCl, respectively. Our results suggest that the application of 0.5% NaCl to a habitat for 3 days is effective for Ae. albopictus control.