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Resistance Potential of Chrysoperla carnea (Stephens) to Insecticides Used Against Sucking Complex of Cotton
Mubasshir Sohail,
Muhamad Haider Nasar,
Raza Muhammad,
Qadeer Ahmed Soomro,
Muhammad Usman Asif,
Jan Muhammad Maari
Issue:
Volume 4, Issue 1, March 2019
Pages:
1-7
Received:
30 November 2018
Accepted:
17 December 2018
Published:
5 March 2019
Abstract: The reported high loss mortality rate of green lacewing, (Chrysoperla carnea) have been attributed to diverse factors including unattended use of insecticides. Since chemical control is one of a significant practice to manage insect pest in cotton. However, this kind of practice may impair the natural control provided by generalist predator C. carnea. Although, natural control adoption is limited in crops, area and season due to wide-spread use of insecticides but presence of resistance potential in C. carnea may improve the design of solid IPM strategies. Herein, we aimed to assess the toxicity of four insecticides to two strains of C. carnea (viz. laboratory reared and field collected adults) and to evaluate their resistance potential by calculating their resistance ratio. LC50 was calculated at 24 h following topical application administered when the adults were 3 days old. Control adult mortalities were less than 10% at 24 h. The LC50 values (µl mL-1) for laboratory reared strains of each tested insecticide were: acetamiprid, 0.0064; bifenthrin, 3.75; chlorpyrifos, 0.067; and profenofos, 0.052. The LC50 values for field collected strains were 0.096 (acetamiprid), 34.8 (bifenthrin), 0.21 (chlorpyrifos) and 0.44 (profenofos). The toxicity of the test insecticide to C. carnea from more to least toxic was acetamiprid > profenofos > chlorpyrifos > bifenthrin. Field collected strain possessed 15 (acetamiprid)-, 9.28 (bifenthrin)-, 3.13 (chlorpyrifos)-, and 8.5 (profenofos)-fold more resistance than the susceptible population. These results are pretty worthwhile for integration of C. carnea in IPM programs, impairing with insecticides.
Abstract: The reported high loss mortality rate of green lacewing, (Chrysoperla carnea) have been attributed to diverse factors including unattended use of insecticides. Since chemical control is one of a significant practice to manage insect pest in cotton. However, this kind of practice may impair the natural control provided by generalist predator C. carn...
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Marine Mammals on the Egyptian Mediterranean Coast "Records and Vulnerability"
Mahmoud Mahrous Sayed Farrag,
Hamdy Omar Ahmed,
Mohamed Mohamed Mohamed TouTou,
Mohamed Mahmoud Eissawi
Issue:
Volume 4, Issue 1, March 2019
Pages:
8-16
Received:
24 December 2018
Accepted:
31 January 2019
Published:
14 March 2019
Abstract: This work documents strandings and sightings of vulnerable marine mammals on the Egyptian Coast of the Mediterranean Sea, with an emphasis on 2013 to 2018 as well as previous non documented strandings observed by other persons. Marine mammal cases were described and identified to six species: the fin whale (Balaenoptera physalus Linnaeus, 1758), the sperm whale (Physeter microcephalus), Gervais’ beaked whale Mesoplodon europaeus (Gervais, 1855), the common bottlenose dolphin (Tursiops truncates), the rough-toothed dolphin (Steno bredanensis) that which was stranded on the Gamasa coast and was not completely confirmed. The sixth species was California sea lion (Zalophus californianus Lesson, 1828) which was reported for the first time. Moreover, the monk seal (Monachus monachus) was also reported here but has not been observed by the authors; this observation increases the reported species on the Mediterranean coast of Egypt into seven species. The first five species are cetaceans including a baleen whale (Mysticeti) for first whale and toothed species (Odontoceti) for the remaining four species, while the last two ones belong to Pinnipeds (sea lion and monk seal). Most of the observed cases were strandings, while the sea lion was sighted alive. The sea lion is not endemic for Mediterranean sea and its presence may be an accidental or may escape from aquarium. There were also few other records of dead delphinid carcasses that were in a highly decomposed state and could not be identified. In conclusion, this work is important issue in term of documenting marine mammals in the Egyptian Mediterranean water and indicates that the coast has increasingly become a visiting area for many marine mammals, with a concomitant increase in stranding's. These observations reflect their vulnerability due to anthropogenic activities such as fishing operations, shipping, and seismic activities. Moreover, the Egyptian coast has shallower and wider continental shelf in the Nile Delta region which may increase the probability of marine mammals' visitors stranding's, particularly a mong species that inhabit deep water. The repeated sightings of these species may be due to climatic changes that affect their migration and mobility from one place to another. Stakeholders should pay more attention to marine mammals in Egypt through increased awareness and the continuous monitoring, documentation and mapping of recorded strandings to further suggest measures on how to protect these important and vulnerable species.
Abstract: This work documents strandings and sightings of vulnerable marine mammals on the Egyptian Coast of the Mediterranean Sea, with an emphasis on 2013 to 2018 as well as previous non documented strandings observed by other persons. Marine mammal cases were described and identified to six species: the fin whale (Balaenoptera physalus Linnaeus, 1758), th...
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Using Landsat Data to Assess the Status of Coral Reefs Cover along the Red Sea Coast, Egypt
Mostafa Khaled,
Frank Muller-Karger,
Ahmad Obuid-Allah,
Mahmoud Ahmed,
Sameh El-Kafrawy
Issue:
Volume 4, Issue 1, March 2019
Pages:
17-31
Received:
29 December 2018
Accepted:
16 February 2019
Published:
14 March 2019
Abstract: The Egyptian Red Sea coast has experienced rapid development since the 1970’s. In particular, the coastal area near the City of Hurghada has been transformed into a long strip of touristic villages and hotels in this short time span. This is an area that has historically had abundant and diverse coral reef communities. To assess possible impacts on benthic coral reef cover in the region, Landsat satellite data collected over the Red Sea from 1973 through 2015 were analyzed to estimate urban expansion in the Hurghada region, shoreline changes, and changes in coral reef cover over time. A time series of satellite observations using Landsat 1-MSS, Landsat 5-TM, Landsat 7-ETM+, and Landsat 8-OLI was assembled, with images acquired in 1973, 1984, 1987, 1992, 1998, 2000, 2003, 2010, and 2015. Images were geometrically, radiometrically and atmospherically corrected, and a water-column correction was implemented prior to comparing images to assess change in landcover. The results show that during the last 42 years, the coral reef cover decreased 6.21 Km2 while the built coastal area increased 13.4 Km2. These observations were used to compute total economic value (TEV) of coral reef habitats and the cost of degradation in terms of physical losses of coral reef area which equals about18.63$ Billion.
Abstract: The Egyptian Red Sea coast has experienced rapid development since the 1970’s. In particular, the coastal area near the City of Hurghada has been transformed into a long strip of touristic villages and hotels in this short time span. This is an area that has historically had abundant and diverse coral reef communities. To assess possible impacts on...
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Management of Septoria Tritici Blotch (Septoria tritici) of Bread Wheat (Triticum aestivum L.) in the Central Highlands of Ethiopia
Yitagesu Tadesse,
Alemayehu Chala,
Bekele Kassa
Issue:
Volume 4, Issue 1, March 2019
Pages:
32-41
Received:
25 December 2018
Accepted:
21 March 2019
Published:
13 April 2019
Abstract: Septoria tritici blotch (STB) is an economically important foliar disease in the major wheat-growing areas of Ethiopia. The current research was conducted to determine the impact of wheat varieties and fungicides on disease development and wheat yield. Besides, the effect of bread wheat varieties and fungicides on STB development, wheat yield was evaluated at Holleta and Kulumsa in a factorial field experiment involving three bread wheat varieties and six fungicide spray schedules. At Holetta, variety Kekeba had the highest AUDPC (2548) value followed by Madawalabu and Alidoro; whereas at Kulumsa the highest AUDPC (1509) was recorded on variety Madawalabu followed by Alidoro and Kekeba varieties. STB incidence and severity were significantly reduced by the application of fungicides across varieties but fungicide-variety combinations had differential effects on disease development. Wheat grain yields were the lowest from unsprayed plots regardless of variety and location. Kekeba variety treated with Mancozeb-Tilt-Mancozeb-Tilt (MTMT) fungicide combination produced the highest yield (5.05t/ha). The highest (577.31%) and lowest (-19.95%) marginal rate of return were obtained from Tilt and MTMT sprayed fields at Holetta planted with Kekeba and Madawalabu varieties, respectively. On the other hand, at Kulumsa, the highest marginal rate of return (886.88%) and the lowest marginal rate of return (-63.98%) was obtained from Tilt and Mancozeb sprays on Madawalabu and Alidoro varieties, respectively. The present findings confirmed the importance of STB in Ethiopia and the role fungicides play in managing the disease on partially resistant varieties.
Abstract: Septoria tritici blotch (STB) is an economically important foliar disease in the major wheat-growing areas of Ethiopia. The current research was conducted to determine the impact of wheat varieties and fungicides on disease development and wheat yield. Besides, the effect of bread wheat varieties and fungicides on STB development, wheat yield was e...
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