Mosquito larval surveys were carried out on Yap Islands in October and November 1999, Larvae were collected from 60 natural and artificial habitats. A total of 723 larvae belonging to 10 species including two unidentified species were collected. Among them, Aedes hensilli was the most predominant species collected (70.0%) followed by Ae, maehteri (13.4%), Ae, lameltdertts (8,4%) and Culex quinquefasciatus (4,8%), The sarne surveys were also carried out at 56 larval habitats on four inhabited islands of Ulithi Atoll (Mogmog, Falarop, Asor and Fassarai) in October 2001, A total of 658 larvae were collected from 56 habitats on the islands. Two mosquito species, Ae, hensiUi (71.9%) and Cx, guiquansciatus (28.1%) were collected from 51 and 9 habitats, respectively. Since Ae. aegJtPti and Ae. albQPictus were not collected in the present survey, Ae. hensitli may be implicated as a putative dengue vector in case of an outbreak, Two species, Cx. annutirostris and Ae. Iamelliferns were newly recorded species from Yap Islands,
We have constructed a novel trap experimentally utilizing the behavior of the poultry red mite and compared with precedent other traps in abroad. Firstly, we prepared two types of trap, "nonparallelboard trap" as a novel trap and "parallel-board trap", and we compared the rate of collected mites. Each trap was constituted of overlapping two boards, "nonparallel-board trap" was one side of two boards connected, and "parallel-board trap" was set two boards paralleled. As a result of the comparison, the rate of mites collected by "nonparallel-board trap" was more than "parallel-board trap". On the next investigation, we have compared some "nonparallel-board trap" made of cedar, Japanese cypress, bamboo and polyvinyl chloride for a consideration of appropriate material. The mites were collected by cedar and Japanese cypress more than others, and the statistical significance was recognized in this comparison. Moreover, in the latest investigation, the number of mites collected by this "nonparallel-board trap" made of cider was significantly more than corrugated cardboard and thick card traps previously reported. Therefore, the novel "nonparallel-board trap" might capture the mites efficiently, and it is assumed that the trap is a utilized tool for monitoring and exterminating in the poultry farm, revealing ecology of the mites.
The poultry red mite (Dermanyssus gallinae) is a serious problem for the poultry industry worldwide. However, the relationship between the mite population and the damage that they cause is still unclear. In this study, the mite population in poultry houses was examined using an established trap method, and the risk of blood-stained eggs caused by the mites was assessed. Traps were placed once a week outside the egg channels and/or on the floor in two poultry farms in Fukuoka Prefecture, Japan, from April 2012 to July 2014. The numbers of blood-stained eggs and total eggs were counted at weekly intervals. The results showed that the number of mites increased from April to May, and reached a peak around the beginning of June when the average temperature and humidity were >24°C and 70-90%, respectively. In the segmented model, the correlation between the proportion of blood-stained eggs and the number of mites or temperature was positive over a threshold. In conclusion, our established trap method is useful for monitoring mites and can be used to predict when poultry farms should be treated to prevent appearance of blood-stained eggs.
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