Phenology and Development of the Yellow Rose Aphid, Acythrosiphon porosum (Sanderson), in Northern Florida and Southern Georgia

2009 ◽  
Vol 44 (1) ◽  
pp. 43-49
Author(s):  
Russell F. Mizell ◽  
William G. Hudson

The yellow rose aphid, Acythrosiphon porosum (Sanderson), is a cosmopolitan pest of roses and strawberries. Acythrosiphon porosum is one of only a few arthropod pests of roses occurring in northern Florida and southern Georgia. Hybrid roses are widely planted around the city of Thomasville, GA, which is known as the Rose City. Three ‘Grandiflora’ rose cultivars ‘Queen Elizabeth’, ‘Roundelay’ and ‘Spartan’ were used to determine cultivar and location effects on A. porosum seasonal abundance and natural enemies. Developmental rate, longevity and nymph production of A. porosum were also investigated at 4 temperatures, 10.0, 15.5, 21.1, and 26.7°C, in environmental chambers using cut leaf discs of ‘Queen Elizabeth’ on agar plates. Acythrosiphon porosum occurred throughout much of the year except for the coldest winter and warmest summer months and reached highest populations during the cooler weather of spring and fall. Cultivar differences were statistically significant at all locations where ‘Queen Elizabeth’ averaged higher aphids per leaf than ‘Roundelay’, which averaged higher aphids than ‘Spartan’. Aphid numbers did not significantly differ in comparisons of leaves sampled from the bottom, middle or top third of the plant's canopy height. Developmental rate calculated as the time from nymph to nymph was most rapid (x̄ = 10.3 d) at 21.1 °C, but no aphid development was observed at 26.7°C. Total egg production was highest (x̄ = 27.5 nymphs per aphid) at 10.0°C as was longevity of 60.1 d. Highest nymph production (1.5 per d) was observed at 21.1 °C. Many generalist predators and two parasitoid species were found in low numbers attacking A. porosum: Syrphophagous aphidovorus (Mayr) (Hymenoptera: Encyrticidae) and Ephedius sp. (Hymenoptera: Aphidiidae).

2011 ◽  
Vol 43 (2) ◽  
pp. 129 ◽  
Author(s):  
Bianca Krüger-Carstensen ◽  
Rudy Plarre

Adapted and effective pest management strategies for the protection of irreplaceable culture heritage as well as for the prevention of damages in households and warehouses are based on reliable information about the presence and distribution of the pest organisms. Monitoring the webbing clothes moth <em>Tineola bisselliella </em>at thirteen outdoor stations in the broader area of Berlin give a first idea of their occurrence in an urban area and the hinterlands. The results demonstrate a seasonal abundance in the city and a missing of this species in the countryside. Data suggest a synanthropic occurrence of the webbing clothes moth rather than an invasion from natural reservoires. Possible molecular examinations on the species and subspecies level are presented to analyze the gene flow between populations and give an impression of species mobility as well as pathways of infestation.


1970 ◽  
Vol 27 (4) ◽  
pp. 685-699 ◽  
Author(s):  
Barry T. Hargrave

Growth, density, and body size of the deposit-feeding amphipod Hyalella azteca, and its food, epibenthic algae, and sediment microflora, were greatest in shallow-water areas of Marion Lake. The vertical distribution of Hyalella was limited to the upper 2 cm of sediment cores. Highest concentrations of sedimentary chlorophyll and lowest concentrations of nondigestible ligninlike material also occurred at the sediment surface.In laboratory substrate-choice experiments, Hyalella differentiated between sediments with different concentrations of microorganisms, and growth depended upon the quantity of microflora in the diet. In Marion Lake, increased growth of Hyalella during June was independent of temperature and closely correlated with increased rates of epibenthic primary production.Egg production, related to body size in a nonlinear manner, began during May as growth rates increased. As a combined result of egg production and juvenile survival, the maximum density of Hyalella in Marion Lake was reached in August.


2007 ◽  
Vol 98 (1) ◽  
pp. 53-56 ◽  
Author(s):  
G. Japoshvili ◽  
N. Gabroshvili ◽  
B. Japoshvili

AbstractThe European fruit lecanium (EFL), Parthenolecanium corni Bouché (Hemiptera: Coccoidea), is a common and harmful soft scale, which attacks Fraxinus oxycarpa Willd. and other ornamental and orchard plants in Tbilisi, Georgia. This study investigates the phenology, degree of plant damage and effect of parasitoids on this scale in Tbilisi, a densely populated area. We present data on the 32 species of chalcidoid parasitoids recorded from EFL in Georgia and south-eastern Europe. The scale is heavily parasitized in Tbilisi, but we did not find any variation in seasonal abundance. The most common parasitoid of EFL was Blastothrix longipennis (Hymenoptera: Encyrtidae).


Author(s):  
Silvija Ozola

The port city Liepaja had gained recognition in Europe and the world by World War I. On the coast of the Baltic Sea a resort developed, to which around 1880 a wide promenade – Kurhaus Avenue provided a functional link between the finance and trade centre in Old Liepaja. On November 8, 1890 the building conditions for Liepaja, developed according to the sample of Riga building regulations, were partly confirmed: the construction territory was divided into districts of wooden and stone buildings. In 1888 after the reconstruction of the trade canal Liepaja became the third most significant port in the Russian Empire. The railway (engineer Gavriil Semikolenov; 1879) and metal bridges (engineers Huten and Ruktesel; 1881) across the trade canal provided the link between Old Liepaja and the industrial territory in New Liepaja, where industrial companies and building of houses developed in the neighbourhood of the railway hub, but in spring 1899 the construction of a ten-kilometre long street electric railway line and power station was commenced. Since September 25 the tram movement provided a regular traffic between Naval Port (Latvian: Karosta), the residential and industrial districts in New Liepaja and the city centre in Old Liepaja. In 1907 the construction of the ambitious “Emperor Alexander’s III Military Port” and maritime fortress was completed, but already in the following year the fortress was closed. In the new military port there were based not only the navy squadrons of the Baltic Sea, but also the Pacific Ocean before sending them off in the war against Japan. The development of Liepaja continued: promenades, surrounded by Dutch linden trees, joined squares and parks in one united plantation system. On September 20, 1910 Liepaja City Council made a decision to close the New Market and start modernization of the city centre. In 1911 Liepaja obtained its symbol – the Rose Square. In the independent Republic of Latvia the implementation of the agrarian reform was started and the task to provide inhabitants with flats was set. Around 1927 in the Technical Department of Liepaja City the development of the master-plan was started: the territory of the city was divided into the industrial, commercial, residential and resort zone, which was greened. It was planned to lengthen Lord’s (Latvian: Kungu) Street with a dam, partly filling up Lake Liepaja in order to build the water-main and provide traffic with the eastern bank. The passed “Law of City Lands” and “Regulations for City Construction and Development of Construction Plans and Development Procedure” in Latvia Republic in 1928 promoted a gradual development of cities. In 1932 Liepaja received the radio transmitter. On the northern outskirts a sugar factory was built (architect Kārlis Bikše; 1933). The construction of the city centre was supplemented with the Latvian Society House (architect Kārlis Blauss and Valdis Zebauers; 1934-1935) and Army Economical Shop (architect Aleksandrs Racenis), as well as the building of a pawnshop and saving bank (architect Valdis Zebauers; 1936-1937). The hotel “Pēterpils”, which became the property of the municipality in 1936, was renamed as the “City Hotel” and it was rebuilt in 1938. In New Liepaja the Friendly Appeal Elementary school was built (architect Karlis Bikše), but in the Naval Officers Meeting House was restored and it was adapted for the needs of the Red Cross Bone Tuberculosis Sanatorium (architect Aleksandrs Klinklāvs; 1930-1939). The Soviet military power was restored in Latvia and it was included in the Union of Soviet Socialist Republics. During the World War II buildings in the city centre around the Rose Square and Great (Latvian: Lielā) Street were razed. When the war finished, the “Building Complex Scheme for 1946-1950” was developed for Liepaja. In August 1950 the city was announced as closed: the trade port was adapted to military needs. Neglecting the historical planning of the city, in 1952 the restoration of the city centre building was started, applying standard projects. The restoration of Liepaja City centre building carried out during the post-war period has not been studied. Research goal: analyse restoration proposals for Liepaja City centre building, destroyed during World War II, and the conception appropriate to the socialism ideology and further development of construction.


1984 ◽  
Vol 116 (3) ◽  
pp. 443-449 ◽  
Author(s):  
Chris T. Maier

AbstractParasitoids of the trivoltine spotted tentiform leafminer, Phyllonorycter blancardella (Fabr.), were studied in Connecticut apple orchards to determine their relative importance, emergence patterns, and seasonal abundance. Sixteen parasitoid species, including 12 eulophids, emerged from mines formed by 4th- and 5th-instar leafminer larvae. The species were primary, secondary, or facultative secondary parasitoids. Five were new records. The braconid Pholetesor ornigis (Weed) was the most abundant in the first and third leafminer generations, and the eulophid Sympiesis marylandensis Girault was the most abundant in the second generation. Ratios of parasitoids to Phyllonorycter spp. were generally higher in samples from unsprayed trees than in those from sprayed trees. Major parasitoids usually emerged 1 to 4 wk before their larval hosts became plentiful. Sweep samples indicated relatively high abundance of one or both major parasitoids during the first and second leafminer generations. Monitoring of parasitoids and the judicious use of insecticides may have a critical role in pest management programs utilizing native parasitoids of leafminers.


Author(s):  
Mario Mollo Neto ◽  
Maria Elena Silva Montanhani ◽  
Leda Gobbo de Freitas Bueno ◽  
Erick Dos Santos Harada ◽  
Danilo Florentino Pereira

Climatic changes and high temperatures have been affecting animal production and the well-being of laying birds, with heat stress and high mortality rates, generating economic losses. Legacy databases can contain information to help model thermal comfort at climatic extremes. They can enable decision trees to be created through the use of data mining to prevent mortality and production losses. Thus, the objective of this study is to seek to develop decision trees, for application as an alert system, for the incidence of caloric stress in the production of layers. We used a database of three aviaries located in the city of Bastos-SP, collected in 2013. The data were organized in Excel® spreadsheets, and processed with the Weka® software with the J48 (C4.5) algorithm for mining of the data. The technique allowed the construction of decision trees that in the chosen sheds were classified with respectively 99.73%, 99.61%, and 98.71% of correct answers and with Kappa indexes equal to 0.9958, 0.9907 and 0.9663, which indicate that the three classifiers built are excellent. Thus, the proposed system, with the decision trees built, can serve as a basis for the construction of an alert system to be applied to the three warehouses simultaneously.


2019 ◽  
Vol 2 (1) ◽  
pp. 121-129
Author(s):  
J. O Aiyedun

Brucellosis is one of the most important zoonosis in the world; it is highly contagious and caused by a group of organisms in the genus Brucella. The disease remains endemic in Nigeria and its actual incidence and prevalence are unknown due to both inadequate surveillance and systems of reporting outbreaks. This study was designed to determine the sero-prevalence of bovine brucellosis in Ilorin, Kwara State, a gateway to states, and countries engaging in livestock trades within and around Nigeria. A total of 224 blood samples were randomly collected from cattle slaughtered at the two metropolitan abattoirs in the city. The study employed a combination of 2 serological techniques; the Rose Bengal Plate Test (RBPT) and the Serum Agglutination Tube Test (SAT). Of the 224 cattle screened, 10.71% tested positive with Rose Bengal Antigen, while 11.16% tested positive for Serum Agglutination Tube Test (SATT). Prevalence was higher in cows (11.44%) than in bulls (8.69%). There was no significant relationship between the prevalence of bovine brucellosis and any of the variables examined. However, the overall prevalence (11.16%) observed in the study was significant. Thus, the need for drastic public health interventions/control measures on brucellosis in the livestock industry in Nigeria.


2021 ◽  
Vol 8 (2) ◽  
pp. 191
Author(s):  
Filipus Cahya Kusuma Putra ◽  
Yaktiworo Indriani ◽  
Maya Riantini

This study aims to analyze the process of procuring production facilities in accordance with the right six (on time, place, quality, quantity, type, and price), farm performance, the marketing efficiency of the agribusiness system, and the supporting institutions for ornamental flower agribusiness systems at Lampung. This study uses a survey method conducted in the city of Bandar Lampung, namely in Gunung Terang, Gunung Agung and in the Way Halim Permai. Sampling in this study was sixteen respondents taken using a quota sampling technique. Data collection was carried out in September - October 2019. The results showed that the procurement of production facilities of ornamental flower plant farming had fulfilled the right six. Ornamental flower farming in Bandar Lampung is feasible to be cultivated because in farming it has an R / C ratio> 1, that is, the R / C over the total cost of 1.70 of adenium flowers, 2.00 of orchids, and 1.60 of roses. The three ornamental flower plants studied have a profit margin ratio of more than 1 which is 1.41 of the adenium flower, 1.80 of the orchid flower, and 1.81 of the rose flower, which means that the ornamental flower farmers in Bandar Lampung receives profits and no loss. Supporting institutions in the flower plant agribusiness system at the research location are financial institutions, namely banks as financing and borrowing funds, government policies, and transportation. All these supporting institutions are available but have not been used optimally by farmers.Key words: agribusiness system, R/C, profit margin ratio


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