scholarly journals Colony Suppression and Possible Colony Elimination of the Subterranean Termites Coptotermes formosanus and Reticulitermes speratus by Discontinuous Soil Treatment Using a Diluent of Fipronil Suspension Concentrate

Insects ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 334
Author(s):  
Shuji Itakura ◽  
Johji Ohdake ◽  
Takashi Takino ◽  
Kiwamu Umezawa
Keyword(s):  
Residue Analysis ◽  
Coptotermes Formosanus ◽  
Test Area ◽  
Soil Treatment ◽  
Subterranean Termites ◽  
Microsatellite Genotyping ◽  
Reticulitermes Speratus ◽  
Before And After ◽  
Ground Monitoring ◽  
Colony Level

We assessed the efficacy of a discontinuous soil treatment using a diluent of fipronil suspension concentrate in controlling colonies of Coptotermes formosanus and Reticulitermes speratus. In-ground monitoring stations were installed at Isogi Park and Kindai University, and individual termites inhabiting the stations were collected for four or six years to determine the numbers and locations of colonies present in test areas before and after the discontinuous soil treatment. Microsatellite genotyping indicated that two C. formosanus and two R. speratus colonies in the test area at Isogi Park and five R. speratus colonies in the test area at Kindai University were active and that their territories fluctuated every year. One of the two C. formosanus colonies at Isogi Park and one of the five R. speratus colonies at Kindai University were subjected to discontinuous soil treatments with fipronil and were strongly affected by the treatment at the colony level, resulting in the suppression and possible elimination of colonies. Termite activity of the fipronil-treated colony of C. formosanus was detected within one week after the discontinuous soil treatment and was not found for more than two years (28 months), while termite activity of the fipronil-treated colony of R. speratus was detected within four days and three weeks after the discontinuous soil treatment and was not detected thereafter for three years. Fipronil residue analysis showed that workers of C. formosanus moved at least 28 m and that workers of R. speratus moved 6 m from the treated soil locations for up to three weeks.

Effects of Heat Treatments of Wood on the Feeding Behaviour of Two Subterranean Termites

Holzforschung ◽  
1999 ◽  
Vol 53 (3) ◽  
pp. 225-229 ◽  
Author(s):  
S. Doi ◽  
Y. Kurimoto ◽  
W. Ohmura ◽  
S. Ohara ◽  
M. Aoyama ◽  
...  
Keyword(s):  
Feeding Behaviour ◽  
Coptotermes Formosanus ◽  
Hot Water ◽  
Steam Treatment ◽  
Subterranean Termites ◽  
Termite Species ◽  
Reticulitermes Speratus ◽  
Japanese Beech ◽  
Hot Water Extraction ◽  
Choice Feeding

Summary This paper deals with the results of choice feeding tests of two termite species, Coptotermes formosanus Shiraki and Reticulitermes speratus (Kolbe), with steam-treated and dry-heated samples of Japanese commercial woods. Some steam-treated species were heavily attacked by C. formosanus and R. speratus while all dry-heated samples were attacked not more than unheated controls except for the combination Japanese larch-R. speratus. The steam treatment in some wood species produced feeding attractants which were removed by hot water extraction. Termite species showed some differences in the susceptibility to these substances. Attraction of the termites to steam-treated Japanese beech was different from that to the steam-treated softwoods. These phenomena were discussed with references to heat treatment of wood as well as to termite attractive factors.

scholarly journals Significant Feeding Deterrent of Berberine from Tali kuning(Tinospora dissitiflora Diels) Against Two Subterranean Termites Coptotermes formosanus Shiraki and Reticulitermes speratus Kolbe

2017 ◽  
Vol 3 (1) ◽  
pp. 18-22
Author(s):  
Wahyudi Wahyudi ◽  
Yoshito Ohtani ◽  
Hideaki Ichiura
Keyword(s):  
Coptotermes Formosanus ◽  
Feeding Deterrent ◽  
Subterranean Termites ◽  
Chloroform Fraction ◽  
Reticulitermes Speratus ◽  
Chemical Substances ◽  
Berberine Chloride ◽  
Mass Losses ◽  
Coptotermes Formosanus Shiraki ◽  
Filter Papers

Antifeedant activities of berberine isolated from the chloroform fraction of Tali kuning (Tinospora dissitiflora Diels) were evaluated against two subterranean termites, Coptotermes formosanus Shiraki and Reticulitermes speratus Kolbe, respectively. The chloroform fraction of methanol extracts of Tali kuning and authentic berberine chloride were used for comparison. Three replicates and levels of concentrations, 12.5, 25, and 50 mg/ml, respectively, were employed. Filtepapers treated with three chemical substances were used to evaluate the mass losses of the filter paper consumed by the termites, and filter papers treated only with MeOH were used for control. Mass loss (MS), termite mortality (TM) and antifeedant index (AFI) were used to determine the antifeedant variables. The results indicated that regardless of three chemical substances tested, the MS recorded from C. formosanus Shiraki were 2.87 times higher than those of R. speratus Kolbe, and among three levels concentration, 50 mg/ml gave the lowest MS (2.13%). Authentic berberine chloride gave the highest TM (99%), followed by chloroform fraction (88%) and berberine (73%). Interestingly, all antifeedant variables employed in this study gave AFI values less than 20%, indicating significant feeding deterrent activity against two subterranean termites.

scholarly journals Chosen statistical methods for the detection of outliers in real estate market analysis

2020 ◽  
Vol 19 (2) ◽  
Author(s):  
Beata Śpiewak ◽  
Anna Barańska
Keyword(s):  
Real Estate ◽  
Statistical Methods ◽  
Residue Analysis ◽  
Functional Model ◽  
Real Estate Market ◽  
Market Analysis ◽  
Parameters Estimation ◽  
Estimation Of Parameters ◽  
Before And After ◽  
Detection Of Outliers

The paper contains the comparison of mechanism of two separately constructed statistical methods for the detection of outliers in real estate market analysis. For this purpose, databases with various types of real estate from local markets were created. Then the estimation of parameters of functional models describing dependencies prevailing on the examined markets was carried out. Subsequently, statistical tools called Baarda method and model residue analysis were used to detect outliers in the collected datasets. The last stage was a comparison of the obtained results of the parameters' estimation of the analyzed models and the measures of their quality, before and after the removal of outliers. The obtained results indicate that algorithms of chosen statistical methods, detecting outliers, allow to eliminate a smaller number of them, at the same time obtaining an improvement of the parameters of the functional model and its adjustment to the analyzed dataset. This gives the premise for the development of criteria for the selection of statistical methods that look for gross errors in the analyzed databases, among others, depending on functional model used, type of property and number of properties.

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