scholarly journals Monitoring Resistance to Spinosad in the Melon Fly (Bactrocera cucurbitae) in Hawaii and Taiwan

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Ju-Chun Hsu ◽  
David S. Haymer ◽  
Ming-Yi Chou ◽  
Hai-Tung Feng ◽  
Hsaio-Han Chen ◽  
...  

Spinosad is a natural insecticide with desirable qualities, and it is widely used as an alternative to organophosphates for control of pests such as the melon fly,Bactrocera cucurbitae(Coquillett). To monitor the potential for development of resistance, information about the current levels of tolerance to spinosad in melon fly populations were established in this study. Spinosad tolerance bioassays were conducted using both topical applications and feeding methods on flies from field populations with extensive exposure to spinosad as well as from collections with little or no prior exposure. Increased levels of resistance were observed in flies from the field populations. Also, higher dosages were generally required to achieve specific levels of mortality using topical applications compared to the feeding method, but these levels were all lower than those used for many organophosphate-based food lures. Our information is important for maintaining effective programs for melon fly management using spinosad.

2018 ◽  
Vol 68 (5) ◽  
pp. 499-507 ◽  
Author(s):  
Shravan Manbhar Haldhar ◽  
Dilip Kumar Samadia ◽  
Rakesh Bhargava ◽  
Balu Ram Choudhary ◽  
Dhurendra Singh

2013 ◽  
Vol 18 (1) ◽  
Author(s):  
Elizabeth M. Yako ◽  
Noreen P.B. Nzama

The focus of this study was to explore and describe influences on decision making related to infant feeding methods in the context of HIV and AIDS. Study objectives were: (1) to explore and describe the influences on decision making related to infant feeding methods selected by the mother during the antenatal period and (2) to describe the reasons related to a change in infant feeding method in the postnatal period. This cross-sectional study used the quantitative approach and a descriptive design. A convenience sample of 60 mothers in the prevention of mother-to-child transmission programme participated in this study. Data were collected six weeks post-delivery and analysed using SPSS 17.0 software for Windows. The mean age of the mothers was 26.5 years, range 19 to 41 years (SD 5.3). At six weeks 73% (n = 44) of the mothers maintained the infant feeding method selected antenatally and 27% (n = 16) had changed methods. Using a Chi-square test, the difference between groups was significant (x2 [df 1] = 19, p < 0.000). Every HIV-positive mother (100%, n = 28) continued with the method selected antenatally, compared with 50% (n = 16) of all HIV-negative mothers (n = 32). The reasons for deciding to change methods included going back to school or work; illness of babies; painful breasts; and advice from significant others. Most mothers maintained the feeding methods selected antenatally. HIV-positive mothers were more likely to adhere to the initial decisions made antenatally than HIV-negative mothers.Hierdie studie is gedoen om deeglike navorsing uit te voer en om ‘n beskrywende verslag te kan lewer rakende die invloed van besluitneming met die voedings metodes op babas in die konteks van MIV en VIGS. (1) Deeglike navorsing om beskrywende verslag te kan lewer rakende die besluitnemings met betrekking tot die baba voedings metodes wat deur die moeder geselekteer is gedurende die voorgeboorte periode, en (2) om die redes te beskryf aangaande die verandering in die baba voedings metode nageboortelike periode.Kwantitiewe benadering was gebruik, waartydens 60 moeders deelgeneem het, aan die oordraagbaarheid van moeder na baba. Inligting was ingewin ses weke na geboorte van die baba. Die gemiddelde ouderdom van die moeders was 26.5 jaar, gewissel tussen die ouderdomme van 19 tot 41 jaar (SD 5.3). Op ses weke het 73% (n = 44) van die moeders volgehou met die voedingsmetode wat hulle geselekteer het voorgeboortelik. Sewe-en-twintig (n = 16) het die verkose metodes verander. Die ‘Chi-square’ toets was gebruik, en die verskil tussen die groepe was beduidend (x² [df 1] = 19, p < 0.000). Elke MIV-positiewe moeder (100%, n = 28) het voortgegaan met die metode wat hulle voorgeboortelik verkies het, in vergeleke met 50% van moeders (n = 16) wat MIV negatief was (n = 32). Die redes vir die veranderings, was om teruggekeer na hul werk of skool, borste wat pyn en deur die invloed van ander invloedryke mense. Die meeste moeders het gebly by hul metode wat hulle voorgeboortelik gekies het, spesiaal MIV-positiewe moeders.


2013 ◽  
Vol 684 ◽  
pp. 303-306
Author(s):  
Eugene Rhee ◽  
Ji Hoon Lee

There are various feeding methods of antenna like as coaxial probe, coupling, parasitic elements, and impedance matching. This paper adopted the microstrip line method as the feeding method of the antenna. The high frequency structure simulator is used to analyze the characteristics of the T-shaped microstrip antenna with various patch dimensions. In comparison with the basic microstrip antenna, this proposed T-shaped microstrip antenna with 40.38 % of patch dimensions has the optimum characteristics of resonant frequency, return loss, and radiation pattern at 2.0 GHz band.


2008 ◽  
pp. 2332-2335
Author(s):  
George Hangay ◽  
Susan V. Gruner ◽  
F. W. Howard ◽  
John L. Capinera ◽  
Eugene J. Gerberg ◽  
...  

2021 ◽  
Vol 30 (2) ◽  
pp. 179-185
Author(s):  
Farhana Ferdousi ◽  
Shanjida Sultana ◽  
Tangin Akter ◽  
Pinakshi Roy ◽  
Shefali Begum

The flight activity and flight muscle of the melon fly, Bactrocera cucurbitae (Coquillett) (Diptera: Tephritidae) were observed. The Tethered technique was used to observe the flight activity in this study. The flight activity, and wing and flight muscles were compared between male and female melon flies. The results indicate that the female was relatively better and strong flier than the male. The mean duration of the flight activity of the females was 13.90 min/hour and of the males was 7.12 min./hour. The mean length, width, volume of wings of the males were 6.07 mm, 2.67 mm and 10.99 mm³, respectively. On the other hand, the mean length, width and volume of the wings of females were 7.07 mm, 2.87 mm and 15.60 mm³, respectively. In case of wing muscles, the mean volume of dorsal longitudinal muscle (DLM) in male and female was found 5.20 mm³ and 5.67 mm³, respectively. The mean length of flight wing muscle of male and female was 2.22 and 2.23 mm, respectively and the mean breadth of male and female was 1.65 and 1.77 mm, respectively. Dhaka Univ. J. Biol. Sci. 30(2): 179-185, 2021 (July)


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