Romero-Frias A.,National University of Colombia |
Romero-Frias A.,Antonio Narino University |
Murata Y.,Fuji Flavor Co. |
Bento J.M.S.,University of Sao Paulo |
Osorio C.,National University of Colombia
Bioscience, Biotechnology and Biochemistry | Year: 2016
The guava weevil, Conotrachelus psidii is an aggressive pest of guava (Psidium guajava L.) that causes irreparable damages inside the fruit. The volatile compounds of male and female insects were separately collected by headspace solid-phase microextraction or with dynamic headspace collection on a polymer sorbent, and comparatively analyzed by GC-MS. (1R,2S,6R)-2-Hydroxymethyl-2,6-dimethyl-3-oxabicyclo[4.2.0]octane (papayanol), and (1R,2S,6R)-2,6-dimethyl-3-oxabicyclo[4.2.0]octane-2-carbaldehyde (papayanal) were identified (ratio of 9:1, respectively) as male-specific guava weevil volatiles. Papayanal structure was confirmed by comparison of spectroscopic (EIMS) and chromatographic (retention time) data with those of the synthetic pure compound. The behavioral response of the above-mentioned compounds was studied in a Y-tube olfactometer bioassay, and their role as aggregation pheromone candidate components was suggested in this species. © 2016 Japan Society for Bioscience, Biotechnology, and Agrochemistry.
Endo N.,Japan National Agricultural Research Center |
Wada T.,Japan National Agricultural Research Center |
Sasaki R.,Fuji Flavor Co.
Applied Entomology and Zoology | Year: 2011
Seasonal catches of the bean bug, Riptortus pedestris (Fabricius), captured in traps containing the synthetic pheromone, were investigated under different field conditions from 2005 to 2007. In soybean fields, the number of bugs attracted to the pheromone traps increased after flowering and peaked 9-13 days after flowering. After these attraction peaks, the populations of adult bugs and nymphs increased in soybean fields. In traps located in grassland, however, only small numbers of the bugs were caught during the soybean flowering stages (from mid August to early September). The sex ratio of adults caught in the pheromone traps differed among soybean growth stages. Before flowering, more males were caught than females. After flowering, trapped females increased in number and the proportion of females exceeded 0.5 throughout the flowering periods. These results suggest that attraction to the pheromone may be affected by host plant phenology, and that females, in particular, respond strongly to the pheromone during flowering of the host plant soybean. © 2011 The Japanese Society of Applied Entomology and Zoology.
Tabuchi K.,Japan National Agriculture and Food Research Organization |
Taki H.,Japan Forestry and Forest Products Research Institute |
Iwai H.,Japan National Agriculture and Food Research Organization |
Mizutani N.,Japan National Agriculture and Food Research Organization |
And 3 more authors.
Environmental Entomology | Year: 2014
To determine differences in distribution patterns between the soybean pest Riptortus pedestris F. (Hemiptera: Alydidae) and its egg parasitoid Ooencyrtus nezarae Ishii (Hymenoptera: Encyrtidae) in source and cultivated habitats, we compared their abundances in soybean fields and forest edges, which were assumed to be the overwintering sites of R. pedestris. We set synthetic attractant-baited traps for both species over 2 yr in mid-August, just before R. pedestris normally colonizes soybeans. During one of the 2 yr, we also examined the rate of parasitism using an egg trap. The numbers of both R. pedestris and O. nezarae trapped at forest edges were higher than the numbers caught in soybean fields, suggesting that forest edges are important source habitats. Compared with R. pedestris, the abundance of O. nezarae in soybean fields was considerably lower than in forest edges, presumably because of differences in their dispersal abilities and their responses to landscape structure and resource distribution. Better pest control service by O. nezarae was provided at forest edges than in soybean fields. Therefore, when using pest control by O. nezarae in soybean fields, spatial arrangement and distance from the forest edge should be considered. © 2014 Entomological Society of America.
Nakajima Y.,Kyoto University |
Sakuma M.,Kyoto University |
Sasaki R.,Fuji Flavor Co. |
Fujisaki K.,Kyoto University
Annals of the Entomological Society of America | Year: 2010
Riptortus pedestris (F.) (Heteroptera: Alydidae) females oviposit not only on host plants but also on nonhosts, which may impose high costs on nymphs in terms of locomotion energy and time searching for host plants. Therefore, we hypothesized that second-instar nymphs have developed adaptive traits that help them access host plants, because the first feeding stage occurs during the second instar in this bug. We compared responses to the aggregation pheromone, relative leg lengths, and locomotion performance using a servosphere locomotion compensator as tests of physiological, morphometric, and behavioral traits, respectively, among the instars. We also investigated the effects of delayed feeding in the second instar on subsequent survival and development. Our results indicated that second-instar nymphs might have responded more sensitively to synthetic aggregation pheromone than other instars. Morphological measurements showed that second-instar nymphs had the longest relative leg length compared with other instars. The experiment using the servosphere revealed that second-instar nymphs had higher locomotion performance than did older nymphs, which may allow second-instar nymphs to walk a distance comparable to older nymphs, although their body size is much smaller. However, we did find that more than a 48-h delay in feeding after the first-instar molt decreased subsequent survival rates and that a later first-feeding led to a longer developmental period during the second instar. We concluded that R. pedestris nymphs have evolved various adaptive traits to enhance the probability of accessing host plants in response to the costly oviposition habit of adult females that lay eggs on nonhosts. © 2010 Entomological Society of America.
Fuji Flavor Co. | Date: 2007-03-13
insect traps for tobacco beetles using an attractant.