scholarly journals Factors Affecting the Reproduction and Mass-Rearing of Sclerodermus brevicornis (Hymenoptera: Bethylidae), a Natural Enemy of Exotic Flat-Faced Longhorn Beetles (Coleoptera: Cerambycidae: Lamiinae)

Insects ◽  
2020 ◽  
Vol 11 (10) ◽  
pp. 657
Author(s):  
Costanza Jucker ◽  
Ian C.W. Hardy ◽  
Serena Malabusini ◽  
Silvia de Milato ◽  
Giacomo Zen ◽  
...  

Many species of long-horned beetles are invasive pests causing significant economic damage in agro-forestry systems. They spend the majority of their life-cycle concealed inside natural wood or wooden packaging materials and are largely protected from adverse environmental conditions and pesticide sprays. Biological control via parasitoid natural enemies including members of the bethylid genus Sclerodermus, has proven effective against some long-horned beetles that are invasive in China. In Europe, the biocontrol potential of native Sclerodermus species is being evaluated with a view to developing efficient mass-rearing techniques and then actively deploying them against invasive Asian beetles. Here, we continue evaluations of S. brevicornis by establishing that groups of females that have already reared offspring to emergence are capable of reproducing subsequent hosts and by evaluating the lifetime reproductive capacity of individual females provided with successive hosts. Additionally, we assess the laboratory shelf-life of adult females stored for different times at different temperatures including cold storage, and then assess the post-storage reproductive performance of groups of females provided with a single host. We found that adult female longevity declines with increasing storage temperature and that most aspects of subsequent performance are negatively affected by high temperatures. The adaptability to low temperature storage enhances the suitability of S. brevicornis to mass-rearing programs and thus biocontrol deployment.

2021 ◽  
Vol 27 (1) ◽  
pp. 79-91
Author(s):  
Waheed Ali Panhwar ◽  
Kamran Ahmed Pathan ◽  
Abdul Manan Shaikh ◽  
Safdar Ali Ujjan ◽  
Javed Ahmed Ujan ◽  
...  

The longhorn beetles belongs to family Cerambycidae. The beetles are present in almost all ecosystems, except the ocean and Polar Regions. They are most the important biological control agents into agro-ecosystems. The beetles help in the biological control they eat extensive assortments of tree dwelling, soil dwelling insects and also eat caterpillars, maggots, aphids, bug, ants, wasp. Long horned beetles were gathered from different sites (agricultural fields and their surrounding vegetation) of district Naushahro Feroze with insect net (7.79 cm in diameter and 49.9 cm in length) and hand picking. A of 234 specimens were captured from October 2018 to July 2019. The material was identified into 07 species out of 06 genera. Of which Batocera rubus (Linnaeus, 1758), New Record from Sindh, Batocera rufomaculata (Charles De Geer, 1775), New Record from Sindh, Apriona cinerea (Chevrolat, 1852), New Record from Sindh, Archopalus exoticus (Sharp, 1905), New Record from Pakistan Macrotoma crenata (Fabricius, 1801), New Record from Pakistan, Prionus corpulantus (Bates, 1878) New Record from Sindh, Dorysthenes hugelii (Redtenbacher, 1848), New Record from Pakistan. The highest ratio of specimens were recorded from Mehrabpur and lowest ratio of specimens were recorded from Moro.


Foods ◽  
2022 ◽  
Vol 11 (2) ◽  
pp. 185
Author(s):  
Jing Du ◽  
Yingxue Lin ◽  
Yuan Gao ◽  
Yanyan Tian ◽  
Jixiang Zhang ◽  
...  

Processed unhusked rice is prone to mildew during storage. In this study, the storage conditions were simulated at temperatures of 20, 30, and 35 °C and a relative humidity of 40%, 60% and 80%, respectively. The water, fatty acid, and total starch content and the peak viscosity, mold colony number, protein secondary structure, and spatial structure of rice were monitored in order to propose the critical point of mildew during storage. In the process of rice from lively to moldy, the water content, fatty acid contents and the peak viscosity were increased. The total starch content decreased and then showed a slow increasing trend, while the microstructure of the powder particles changed from smooth and complete to loosen and hollow. With the increase in storage time, the vibration of the amide Ⅰ band of the rice samples decreased slightly, indicating that the total contents of β-fold, β-turn, α-helix, and random curl of the rice protein also changed. PCA (Principal Component Analysis) analysis showed that rice mildew index was closely related to temperature and humidity during storage. In our investigation, the best and most suitable temperature and relative humidity for rice storge is 20 °C and 40%, respectively. These results suggested that temperature and environmental humidity are vital factors affecting the physicochemical properties and nutrient changes, which provides a theoretical basis for the early warning of rice mildew during storage.


Author(s):  
O. K. Halchynska ◽  
◽  
Ya. V. Yarmolenko ◽  

The main condition for ensuring the economic efficiency of agricultural livestock rearing is the maintenance of wellbeing of farm animals, which is characterized by high productive qualities and the necessary reproductive capacity. At the same time, outbreaks of diseases of various etiologies, including parasitic, are often the cause of reduced productivity of animals. Pest insects control is important in the conditions of intensive animal husbandry, when at big farms and complexes animals are concentrated in large numbers. This increases the risk of reproduction and rapid spread of many insects that parasitize farm animals and are carriers of infectious and invasive diseases and cause economic damage due to reduced animal productivity and quality of raw materials. Protection of animals from ecto- and endoparasites requires the development and creation of highly effective antiparasitic drugs, because providing the necessary range of means to combat diseases of animals, inexpensive in price, in user-friendly forms is a way to further development of animal husbandry. Recent years mark a development of the domestic market of medicines for veterinary use, an increase in the number of registered drugs, the development of enterprises producing medicines, an increase in the number of companies engaged in pharmaceutical activities in both wholesale and retail. All this speaks of the prospects of the market of medicines for veterinary use. Specialists working in the field of production and sale of medicines need immediate, objective and reliable information on the state of the pharmaceutical market. This information has a significant volume and dynamism. Identifying the peculiarities of the formation of the market of veterinary goods at the state level should contribute to the improvement of management methods in this sphere, and the development of veterinary entrepreneurship. Therefore, the reorientation of domestic pharmaceutical companies to the principles of marketing will ensure the search, development and production of effective and competitive drugs, which will meet the pressing needs of customers. The aim of the work was to study the structure of the domestic pharmaceutical market, namely veterinary insectoacaricides. Our research focused on such tasks as studying the nomenclature of veterinary insectoacaricides of foreign and domestic manufacturers by the following indicators: manufacturers, species, forms of release and means of administration. The study of imported products also focused on the country of manufacture according to the State Register of Medicines. The study uses the methods of survey, analysis, comparison, generalization to get the required information. Statistical method was used to process the obtained data. Insectoacaricides are a significant share of the domestic pharmaceutical market. The study group is represented by 186 drugs of domestic and foreign manufacture, which is about 3% of the total number of all registered drugs. Of the 186 registered drugs, 35.5% (66) are imported and 64.5% (120) are domestic. Among insectoacaricides of foreign manufacture, the largest market share is occupied by Merial and KRKA, d.d., Novo mesto – 10.6% each (7 drugs each), KVP Pharma and Veterinar-Product GmbH – 9.1% (6 drugs), and among domestic companies the products of TOV “UKRBIONIT”; VK “KRUG”; TOV “NOVA PLUS” comprises 14.2% (17 drugs), TOV “Vetsintez” and TOV “NOVA PLUS” - 10.8% (13 drugs each), TOV “MEDIPROMTEK”, TOV company “Product”, TOV “NVP “SUZIRIA” – 8.3% (10 drugs each). The implementation of marketing activities which includes the research of the pharmaceutical market, allows companies to better adapt to market economy conditions, determine tactics of competitive behavior, adapt to change, improve strategy, change the production process according to consumer requirements and needs.


2019 ◽  
Author(s):  
V.I. Surzhikov

В статье приведены результаты анализа работ отечественных авторов, посвященных оценке экономического и социального ущерба, наносимого опасными гидрологическими явлениями (наводнениями). Все методики носят рекомендательный характер. Авторами принимаются во внимание различные факторы, влияющие на размер ущерба. Использование различных критериев, составляющих ущерб, приводит к получению разных цифр. Большинство методик не являются комплексными, не учитывают региональную специфику. Чаще всего определяется только реальный или прогнозный прямой ущерб, в то время как косвенный ущерб не рассчитывается. Преобладают оценки экономического ущерба в связи с ориентацией статистики на учет материальных ценностей. Социальный ущерб от наводнений оценить сложнее. Однако ущерб здоровью пострадавших от наводнений людей представляет не меньшую проблему, чем ущерб экономики. В статье отмечается, что для минимизации негативного воздействия, наносимого опасными гидрологическими явлениями (наводнениями), чрезвычайно важным является определение территорий потенциально подверженных риску наводнений. Выделено три этапа. На первом этапе требуется создание банка гидрометеорологических данных (превышение опасной отметки уровня воды и случаи затопления близлежащего населённого пункта, максимальные уровни, расходы воды, водного режима). На втором этапе производятся гидрологические расчеты, определяются уровни и расходы воды разной процентной обеспеченности. На третьем этапе на основе данных дистанционного зондирования земли строится цифровой рельеф исследуемой территории, изолинии рельефа нужной детальности, карта зон затопления (на основе рассчитанных уровня и расхода воды разной процентной обеспеченности), определяются площади затопления при 1 и 10 обеспеченности. Завершающим шагом является добавление таких данных Публичной кадастровой карты, как площадь земельного участка, его кадастровая стоимость и вид разрешенного использования. Используя нормативы укрупненных удельных показателей стоимости прямого ущерба в расчете на 1 га затопляемой площади населенных пунктов, возможно рассчитать прогнозный экономический ущерб. Для расчета прогнозного социального ущерба потребуются данные численности населения, проживающего в прогнозируемых зонах затопления, его половозрастной состав, занятость.The article presents the results of an analysis of the works of domestic authors on the assessment of economic and social damage caused by dangerous hydrological phenomena (floods). All methods are advisory in nature. The authors take into account various factors affecting the amount of damage. The use of various criteria constituting the damage leads to different numbers. Most of the methods are not complex, do not take into account regional specifics. Most often, only real or forecast direct damage is determined, while indirect damage is not calculated. Estimates of economic damage prevail in connection with the orientation of statistics on accounting for material values. Social damage from floods is more difficult to assess. However, the damage to the health of people affected by floods is no less a problem than damage to the economy. The article notes that in order to minimize the negative impact caused by hazardous hydrological events (floods), it is extremely important to identify areas that are potentially at risk of floods. Three stages are distinguished. At the first stage, the creation of a hydrometeorological data bank is required (excess of a dangerous water level mark and cases of flooding of a nearby settlement, maximum levels, water discharge, water regime). At the second stage, hydrological calculations are made, the levels and discharges of water of different interest rates are determined. At the third stage, based on the data of remote sensing of the earth, a digital topography of the study area, contour contours of the required detail, a map of flood zones (based on the calculated level and flow rate of water with different percentage coverage) are built, and the flood areas are determined at 1 and 10 coverage. The final step is to add such data of the Public Cadastral Map as the area of the land plot, its cadastral value and type of permitted use. Using the standards of aggregated specific indicators of the cost of direct damage per 1 ha of flooded area of settlements, it is possible to calculate the predicted economic damage. To calculate the predicted social damage, you will need data on the number of people living in the forecasted flood zones, their gender and age composition, and employment.


2016 ◽  
Vol 79 (1) ◽  
pp. 148-152 ◽  
Author(s):  
TIAN DING ◽  
YAN-YAN YU ◽  
CHENG-AN HWANG ◽  
QING-LI DONG ◽  
SHI-GUO CHEN ◽  
...  

ABSTRACT The objectives of this study were to develop a probability model of Staphylococcus aureus enterotoxin A (SEA) production as affected by water activity (aw), pH, and temperature in broth and assess its applicability for milk. The probability of SEA production was assessed in tryptic soy broth using 24 combinations of aw (0.86 to 0.99), pH (5.0 to 7.0), and storage temperature (10 to 30°C). The observed probabilities were fitted with a logistic regression to develop a probability model. The model had a concordant value of 97.5% and concordant index of 0.98, indicating that the model satisfactorily describes the probability of SEA production. The model showed that aw, pH, and temperature were significant factors affecting the probability of toxin production. The model predictions were in good agreement with the observed values obtained from milk. The model may help manufacturers in selecting product pH and aw and storage temperatures to prevent SEA production.


2016 ◽  
Vol 6 (2) ◽  
pp. 51 ◽  
Author(s):  
Yu-ying PAN ◽  
Xiao-hua QIU ◽  
Jin-sheng YANG

<p class="1Body">The effect of TPA and biochemical properties of Yellow Tuna during frozen storage at different temperatures(-18°C, -25°C, -35°C, -45°C<em>, </em>-55°C<em>, </em>-65°C) were studied by measuring the textural characteristics (the hardness, Springiness) salt-solubility of myofibrillar proteins, Ca<sup>2+</sup>ATPase activities. The results indicated that the hardness, springiness, actomyosin salt-solubility, Ca<sup>2+</sup>ATPase activities decreased during the process of frozen storage. Meanwhile, the frozen stored temperature showed great effect on the freezing denaturation of protein (P &lt; 0.05). For the same longer of the storage time, the lower frozen temperature, the less extent of freeze denaturation; Stored in -18°C for three months, the content of Salt soluble protein reduced to zero; Stored in -25°C for 120 <em>days</em>, the content of salt soluble protein also reduced to zero; But stored in -55°C and -65°C, the change is very little. Ca<sup>2+</sup>ATPase activities also reduced to zero after stored in -18°C and -25°C for three months. But stored in -55°C and -65°C, there is no obvious change. Moreover, there is a Positive relationship between the change of texture profile and the content of Salt soluble protein, the lower the storage temperature, the less of the change of texture profile. Therefore, when it is stored in -55°C, the quality of Yellow Tuna can be maintained to the maximum extent within six months.</p>


1981 ◽  
Vol 52 (6) ◽  
pp. 1219-1224 ◽  
Author(s):  
T. H. Camp ◽  
D. G. Stevens ◽  
R. A. Stermer ◽  
J. P. Anthony

2012 ◽  
Vol 54 (5) ◽  
pp. 287-292 ◽  
Author(s):  
André Barretto Bruno Wilke ◽  
Mauro Toledo Marrelli

Over the last two decades, morbidity and mortality from malaria and dengue fever among other pathogens are an increasing Public Health problem. The increase in the geographic distribution of vectors is accompanied by the emergence of viruses and diseases in new areas. There are insufficient specific therapeutic drugs available and there are no reliable vaccines for malaria or dengue, although some progress has been achieved, there is still a long way between its development and actual field use. Most mosquito control measures have failed to achieve their goals, mostly because of the mosquito's great reproductive capacity and genomic flexibility. Chemical control is increasingly restricted due to potential human toxicity, mortality in no target organisms, insecticide resistance, and other environmental impacts. Other strategies for mosquito control are desperately needed. The Sterile Insect Technique (SIT) is a species-specific and environmentally benign method for insect population suppression, it is based on mass rearing, radiation mediated sterilization, and release of a large number of male insects. Releasing of Insects carrying a dominant lethal gene (RIDL) offers a solution to many of the drawbacks of traditional SIT that have limited its application in mosquitoes while maintaining its environmentally friendly and species-specific utility. The self-limiting nature of sterile mosquitoes tends to make the issues related to field use of these somewhat less challenging than for self-spreading systems characteristic of population replacement strategies. They also are closer to field use, so might be appropriate to consider first. The prospect of genetic control methods against mosquito vectored human diseases is rapidly becoming a reality, many decisions will need to be made on a national, regional and international level regarding the biosafety, social, cultural and ethical aspects of the use and deployment of these vector control methods.


1945 ◽  
Vol 23f (1) ◽  
pp. 9-21
Author(s):  
Jesse A. Pearce

In an accelerated storage test at 60 °C. fat levels of 20 and 30% were observed to have no effect on keeping quality of dehydrated pork. Measurements on dried product stored in paper-bodied containers for one year at temperatures from −17.8 °C. to 36.7 °C. showed 15.6 °C. to be less desirable than 23.9°, 0°, or −17.8 °C. Dehydrated pork was stored in tin-plate containers for periods of one year at 23.9 °C. and 36.7 °C. with little decrease in palatability. No difference in storage life was demonstrated between cured and uncured pork, or, as a result of differences in drying times, moisture content |or storage temperature. The product prepared on an atmospheric double-drum drier deteriorated a little more rapidly than vacuum–tray- or tunnel–tray-dried material. The effectiveness of container materials, tin-plate, Reynolds' metal A-10, Dewey and Almy P-16, and 300 MST cellophane, was evaluated and their relative value for dehydrated pork fell in that order.


2020 ◽  
Vol 113 (6) ◽  
pp. 2619-2626
Author(s):  
Apostolos Pekas ◽  
Felix L Wäckers

Abstract Plants play a pivotal role in interactions involving herbivores and their natural enemies. Variation in plant primary and secondary metabolites not only affects herbivores but, directly and indirectly, also their natural enemies. Here, we used a commercial NPK fertilizer to test the impact of three fertilizer, namely 50, 100, and 200 ppm nitrogen, and one control (i.e., water) treatments, on the weight of the nymphs of the whitefly Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae). Subsequently, the whitefly parasitoid Eretmocerus mundus Mercet (Hymenoptera: Aphelinidae) was reared on the different groups of whitefly nymphs and upon parasitoid emergence, the number of oocytes was determined as a measure of reproductive capacity. Trials were done on tomato and tobacco plants. The level of nitrogen concentration in tobacco leaves was directly correlated with the fertilizer applications, thus confirming the effect of our fertilizer treatments. Both in tomato and tobacco plants, healthy as well as parasitized whitefly nymphs, were heaviest in the 200 ppm nitrogen treatment. The highest number of oocytes per female parasitoid was recorded in the 200 ppm nitrogen treatment in tomato (31% more oocytes as compared with the control) and in the 100 and 200 ppm nitrogen treatments in tobacco (200% more oocytes). We suggest that the increase in oocytes was the result of the enhanced size (food quantity) and/or nutritional quality of the whitefly host. The practical implications of these results for the mass rearing of whitefly parasitoids and for biological pest control are discussed.


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