scholarly journals Current status of Harmful Termites (Isoptera) in Hoi An Ancient Town and Effectiveness of Control of Main Harmful Coptotermes with Bait BDM 10

2017 ◽  
Vol 33 (4) ◽  
Author(s):  
Nguyen Quoc Huy
Keyword(s):  
Coptotermes Formosanus ◽  
Current Status ◽  
Control Effect ◽  
Termite Species ◽  
The Third ◽  
Coptotermes Gestroi

The results of investigations and assessments about termites damagging 178 buildings in the Hoi An ancient town identified 6 species of 2 genera and 2 families. In which, Coptotermes was dominant genus with 4 species, and Cryptotermes had 2 species. There were 102/178 investigated buildings being invaded by termites with various levels. There were 4 species identified as major pests for the Hoi An ancient town. The most dangerous termite species for building was Coptotermes gestroi, followed by Coptotermes formosanus, C. ceylonicus and Cryptotermes domesticus. 77 works which were invaded by Coptotermes had been treated with BDM10 bait. The results showed that the efficiency of termite treatment reached 100% in all of works, in which: 78.11% of the works had achieved the control effect just for the first treatmen; 19,39% of the works needed to be treated for the second time and only 2.5% of the works that were severely damaged, needed  the third time for control with bait.

scholarly journals Coptotermes formosanusandCoptotermes gestroi(Blattodea: Rhinotermitidae) Exhibit Quantitatively Different Tunneling Patterns

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Nirmala K. Hapukotuwa ◽  
J. Kenneth Grace
Keyword(s):  
Spatial Dispersion ◽  
Coptotermes Formosanus ◽  
Subterranean Termite ◽  
Foraging Strategies ◽  
Subterranean Termites ◽  
Termite Species ◽  
Coptotermes Gestroi ◽  
Distribution And Ecology ◽  
Tunneling Behavior ◽  
Made In

Tunneling behavior and the spatial dispersion of tunnels constructed by the subterranean termitesCoptotermes formosanusShiraki andCoptotermes gestroi(Wasmann) (formerly known asC. vastatorLight) (Blattodea: Rhinotermitidae) were examined in foraging arenas. The results indicated that these two termite species construct quantitatively different tunnel systems, supporting visual observations made in earlier studies.Coptotermes gestroiconstructed thin, highly branched tunnels, whileC. formosanustended to construct wider and less branched tunnels. Tunnels ofC. gestroishowed more spatial dispersion than those ofC. formosanus, and this species constructed a larger number of tunnels compared toC. formosanus. The presence or absence of food (wood) within the arena did not influence the tunneling pattern of either species. Although previous observations have suggested that these two termite species exhibit different tunneling behaviors; this is the first quantification of the differences. Comparative studies of the foraging behavior of subterranean termite species contribute to our understanding of their distribution and ecology and may help to improve pest management programs, particularly those based on placement of toxic baits. Moreover, differences in tunneling patterns may reflect different foraging strategies optimized for either tropical (C. gestroi) or subtropical/temperate (C. formosanus) environments.

scholarly journals Temperature Preference of Two Invasive Subterranean Termite Species and Their Hybrids (Blattodea: Rhinotermitidae: Coptotermes)

2019 ◽  
Vol 112 (6) ◽  
pp. 2888-2893 ◽  
Author(s):  
Jayshree S Patel ◽  
Thomas Chouvenc ◽  
Nan-Yao Su
Keyword(s):  
Parental Species ◽  
Coptotermes Formosanus ◽  
Subterranean Termites ◽  
Temperature Preference ◽  
Termite Species ◽  
Mean Temperature ◽  
Significant Difference ◽  
Temperature Ranges ◽  
Coptotermes Gestroi ◽  
The Mean

Abstract Temperature preference of two invasive subterranean termites, Coptotermes gestroi (Wasmann) and Coptotermes formosanus Shiraki (Blattodea: Rhinotermitidae), and their hybrids were determined in a horizontal thermal gradient. The activity of workers of four mating combinations: ♀C. gestroi × ♂C. gestroi (C. gestroi), ♀C. formosanus × ♂C. formosanus (C. formosanus), ♀C. gestroi × ♂C. formosanus (Hybrid G), and ♀C. formosanus × ♂C. gestroi (Hybrid F), when placed on the temperature gradients were videotaped and analyzed to determine the mean temperature preference values (mTPV). The temperature ranges for active termites were 21.9–39.5°C for C. gestroi, 11.1–39.5°C for C. formosanus, 25.3–38.2°C for Hybrid G, and 24.9–39.3°C for Hybrid F. There was no significant difference in the mTPV of C. gestroi and both hybrid mating combinations. The mTPV of both Hybrid G and Hybrid F was significantly higher than the parental species C. formosanus. Our results indicate that hybrid populations of C. formosanus and C. gestroi might be more active in tropical than temperate regions, and if established in temperate regions, they will be more active in summer months when the mean temperature exceeds 25°C.

scholarly journals Myopia control effect of defocus incorporated multiple segments (DIMS) spectacle lens in Chinese children: results of a 3-year follow-up study

2021 ◽  
pp. bjophthalmol-2020-317664
Author(s):  
Carly SY Lam ◽  
Wing Chun Tang ◽  
Paul H Lee ◽  
Han Yu Zhang ◽  
Hua Qi ◽  
...  
Keyword(s):  
Repeated Measures ◽  
Mean Difference ◽  
Historical Control ◽  
Control Group ◽  
Control Effect ◽  
Myopia Progression ◽  
The Third ◽  
Spherical Equivalent Refraction ◽  
Mean Differences ◽  
Myopia Control

AimsTo determine myopia progression in children who continued to wear the defocus incorporated multiple segments (DIMS) lenses or switched from single vision (SV) to DIMS lenses for a 1-year period following a 2-year myopia control trial.Methods128 children participated in this study. The children who had worn DIMS lenses continued to wear DIMS lenses (DIMS group), and children who had worn SV lenses switched to wear DIMS lenses (Control-to-DIMS group). Cycloplegic spherical equivalent refraction (SER) and axial length (AL) were measured at 6-month interval. Historical controls were age matched to the DIMS group at 24 months and used for comparing the third-year changes.ResultsOver 3 years, SER and AL changes in the DIMS group (n=65) were −0.52±0.69D and 0.31±0.26 mm; these changes were not statistically significant over time (repeated measures analysis of variance, p>0.05).SER (−0.04±0. 38D) and AL (0.08±0.12 mm) changes in the Control-to-DIMS group (n=55) in the third year were less compared with the first (mean difference=0.45 ± 0.30D, 0.21±0.11 mm, p<0.001) and second (0.34±0.30D, 0.12±0.10 mm, p<0.001) years.Changes in SER and AL in both groups over that period were significantly less than in the historical control group (DIMS vs historical control: mean difference=−0.18±0.42D, p=0.012; 0.08±0.15 mm, p=0.001; Control-to-DIMS versus historical control: adjusted mean differences=−0.30±0.42D, p<0.001; 0.12±0.16 mm, p<0.001).ConclusionsMyopia control effect was sustained in the third year in children who had used the DIMS spectacles in the previous 2 years and was also shown in the children switching from SV to DIMS lenses.

scholarly journals Concentration-Dependent Feeding Deterrence to 20-Hydroxyecdysone for Three Subterranean Termite Species (Blattodea: Rhinotermitidae)

Insects ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 218
Author(s):  
Lucas Carnohan ◽  
Sang-Bin Lee ◽  
Nan-Yao Su
Keyword(s):  
Reticulitermes Flavipes ◽  
Coptotermes Formosanus ◽  
Subterranean Termite ◽  
Choice Test ◽  
Molting Hormone ◽  
Feeding Deterrence ◽  
Insect Feeding ◽  
Substrate Consumption ◽  
Termite Species ◽  
Potential Methods

Effective active ingredients in toxicant bait formulations must be non-deterrent to insect feeding behavior at lethal concentrations. This study evaluated feeding deterrence for Coptotermes formosanus Shiraki, C. gestroi (Wasmann), and Reticulitermes flavipes (Kollar) when provided access to cellulose impregnated with various concentrations of the insect molting hormone, 20-hydroxyecdysone (20E). Termites were exposed to 20E concentrations of 200, 500, 1000 and 2000 ppm and to noviflumuron at 5000 ppm in a 24 h choice-test, and the mass of substrate consumption from treated and untreated media pads was compared for each treatment. 20E feeding deterrence was detected at 500, 1000 and 2000 ppm for C. gestroi, and at 2000 ppm for C. formosanus. No significant differences in consumption of treated and untreated substrate was detected at any concentration for R. flavipes. Potential methods for reducing deterrence are discussed.

Cryptotermes camelus (Isoptera: Kalotermitidae), a new drywood termite species from the Bolivian Chaco

Zootaxa ◽  
2021 ◽  
Vol 4938 (1) ◽  
pp. 145-147
Author(s):  
RUDOLF H. SCHEFFRAHN
Keyword(s):  
Exotic Species ◽  
New World ◽  
Caribbean Basin ◽  
Termite Species ◽  
The Third ◽  
Number Of Species ◽  
Asian Species ◽  
The Caribbean

Cryptotermes Banks, 1906 is the third most diverse kalotermitid genus worldwide after Glyptotermes Froggatt, 1897 and Neotermes Holmgren, 1911, with its greatest diversity found in the Neotropics (Krishna et al. 2013a). Furthermore, the greatest number of species of Cryptotermes are known from the Caribbean Basin (Scheffrahn & Křeček 1999, Casala et al. 2016, Scheffrahn 2019). Although Araujo (1977) and Bacchus (1987) list Cryptotermes domesticus (Haviland, 1898) from Trinidad (treated as mainland) and Panama, respectively, Scheffrahn & Křeček (1999) and Scheffrahn et al. (2009) doubt the existence of this Asian species in the New World. Without C. domesticus, the total extant Neotropical diversity of Cryptotermes is 29 endemic and three exotic species (Constantino 2020). 

Providing Data for Educational Policy in an International Context: The Third International Mathematics and Science Study (TIMSS)

1997 ◽  
Vol 13 (1) ◽  
pp. 49-58 ◽  
Author(s):  
Albert E. Beaton ◽  
Michael O. Martin ◽  
Ina V.S. Mullis
Keyword(s):  
International Perspective ◽  
Current Status ◽  
Informational Needs ◽  
Science Study ◽  
Educational Decisions ◽  
Comparative Performance ◽  
Policy Makers ◽  
International Context ◽  
The Third ◽  
Mathematics And Science

Policy-makers in many nations of the world are involved in educational reforms. In order to make effective educational decisions for the 21st century, policy-makers need information of a wide variety of kinds, for example, comparative performance data and curriculum information from other nations. National assessments can be valuable, but international surveys provide a broader base of information and allow countries to view their current status and planning within an international perspective. The purpose of this paper is to describe the goals of the Third International Mathematics and Science Study and the steps being followed to insure that the results from the study will meet the diverse informational needs of policy-makers.

scholarly journals Virgo and Gravitational-Wave Computing in Europe

2020 ◽  
Vol 245 ◽  
pp. 07050
Author(s):  
Stefano Bagnasco
Keyword(s):  
Gravitational Wave ◽  
Current Status ◽  
Low Latency ◽  
Observational Period ◽  
Compact Binaries ◽  
The Third ◽  
Compact Binary ◽  
Continuous Waves ◽  
The Us ◽  
Wave Event

Advanced Virgo is an interferometer for the detection of gravitational waves at the European Gravitational Observatory in Italy. Along with the two Advanced LIGO interferometers in the US, Advanced Virgo is being used to collect data from astrophysical sources such as compact binary coalescences and is currently running the third observational period, collecting gravitational wave event candidates at a rate of more than once per week. Data from the interferometer are processed by running search pipelines for several expected signals, from coalescing compact binaries to continuous waves and burst events. Furthermore, detector characterisation studies are run. Some of the processing needs to be done with low latency, to be able to provide triggers for other observatories and make multi-messenger observations possible. Deep searches are run offline on external computing centres. Thus, data needs also to be reliably and promptly distributed from the EGO site to computer centres in Europe and the US for further analysis and archival storage. Two of the defining characteristics of Virgo computing are the heterogeneity of the activities and the need to interoperate with LIGO. A very wide array of analysis pipelines differing in scientific target, implementation details and running environment assumptions have to be allowed to run ubiquitously and uniformly on dedicated resources and, in perspective, on heterogeneous infrastructures. The current status, possible strategies and outlook of Virgo computing are discussed.

Effects of Weed Control and Irrigation on the Growth of Young Pecans

1990 ◽  
Vol 4 (4) ◽  
pp. 892-894 ◽  
Author(s):  
Michael G. Patterson ◽  
Glenn Wehtje ◽  
William D. Goff
Keyword(s):  
Weed Control ◽  
Tree Growth ◽  
Chemical Control ◽  
Growing Season ◽  
Control Effect ◽  
Carya Illinoensis ◽  
Maximum Increase ◽  
Tree Diameter ◽  
The Third ◽  
Selective Chemical

The effect of irrigation and weed control by various mechanical and chemical means was evaluated over a 4-yr period on newly planted pecans [Carya illinoensis(Wang.) K. Koch]. Weed control effect on tree growth became evident in the second growing season, and became more pronounced after the third and fourth season. After the fourth season, the maximum increase in tree diameter (384%) was achieved with comprehensive, herbicide-based weed control. Mowing provided a 224% increase, which was equivalent to the untreated (229%). Disking and selective chemical control of grass weeds resulted in 339 and 292% increase, respectively. Cumulative increase in tree diameter was 316 and 271% with and without irrigation, respectively.

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