scholarly journals A Comparison of Disinfectants to Prevent Spread of Potyviruses in Greenhouse Tomato Production

2011 ◽  
Vol 12 (1) ◽  
pp. 19 ◽  
Author(s):  
W. M. Wintermantel

Potyviruses, transmitted by a diverse array of common aphid species, infect a broad range of vegetable crops, and can be problematic in greenhouse tomato production. Once introduced, these viruses are believed to be transmitted plant-to-plant during pruning operations, and can infect large sections of a greenhouse, resulting in significant losses in fruit quality and yield. Several methods are used for virus management in greenhouse production, including rouging of diseased plants and treatment of tools and facilities with virucides to eradicate the virus responsible. To clarify potyvirus transmission efficiency from an infected source during pruning operations, experiments were conducted using direct and serial mechanical inoculation of Potato virus Y (PVY) using a scalpel dipped in a suspension of PVY-infected plant sap. Tests demonstrated that both serial and direct inoculation resulted in significant PVY transmission, but that transmission rates declined after the first few plants in serial transmission. Additional tests evaluated the efficiency of two virucides, a quaternary ammonium solution and sodium hypochlorite, for virus inactivation during pruning operations using a range of concentrations and time points. Results demonstrated that 0.5% sodium hypochlorite treatment for two seconds was sufficient for virus control, and superior to treatment with quaternary ammonium solutions. Accepted for publication 20 December 2010. Published 21 February 2011.

Author(s):  
Bilge Gözener ◽  
Halime Dereli

Tomato comes as the most commonly produced, consumed and subject for trading in the world. Alongside fresh consumption, on the other hand it forms the most significant raw material source of food industry, especially for tomato paste, frozen and dried vegetable-fruit and canned food industry. Turkey's greenhouse vegetable production field for 2016 year is 675173 decars and Antalya forms 51% of this field. Tomato forms 61.72% of Antalya's greenhouse production. The main material of the research consists of interviews made with producers resided in 5 villages/towns, where greenhouse tomato production is carried out densely in Antalya city, Alanya district. In 48 villages and towns, greenhouse tomato production is carried out, according to the official records. In the chosen areas, 365 producers exist. 20% of these producers (73) form the sample size. In the research, it was determined that the producers' average agricultural land possession is 9.13 decars and in 40.53% of these areas they grew tomatoes. None of these producers are engaged in contractual growing. All of the yield is produced for the edible (as table-top item). After the harvest, all of the products are sold in the wholesales market in county and city. 7.89% of the producers have no information on soilless agriculture, as 10.52% of them think that it has no advantages and 73.36% of them recommend traditional agriculture.


1981 ◽  
Vol 10 (2) ◽  
pp. 77-81 ◽  
Author(s):  
Pritam S. Dhillon

According to the 1974 U.S. Census of Agriculture, $31.7 million worth of greenhouse vegetables were produced on a covered area of 37.2 million square feet. Though this represents less than 2 percent of total fresh market vegetable production in the country, traditionally greenhouse vegetables have provided high quality produce during months when field production is at a low level. This has been especially the case in the Northcentral and Northeast regions where a relatively large and affluent population of the metropolitan areas demands a year round supply of fresh vegetables. Much of the greenhouse production relates to the growing of salad items. Tomatoes are the single most important crop accounting for roughly two-thirds of the covered area and value of all greenhouse vegetables. In 1974, 63 percent of the U.S. covered area for tomatoes was located in the Northcentral region, 10 percent in the Northeast and the rest in the South and the West.


HortScience ◽  
2006 ◽  
Vol 41 (4) ◽  
pp. 1023A-1023
Author(s):  
Brian E. Jackson ◽  
Joe M. Kemble ◽  
Amy N. Wright ◽  
Jeff L. Sibley

Tomatoes are the most abundantly produced greenhouse vegetable crop in the United States. The use of compost substrates has increased in recent years for the greenhouse production of many vegetables, bedding plants, and nursery crops. `Blitz' tomatoes were grown during the spring and fall growing seasons in 2004 in six substrate blends of pine bark (PB), a traditional production substrate in the Southeastern U.S., and cotton gin compost (CGC), an agricultural by-product, to assess the potential use of CGC as a viable replacement for PB for the production of greenhouse tomatoes. Treatments ranged from 100% PB to 100% CGC. During both growing seasons, plants grown in substrates containing CGC produced similar total, marketable, and cull yields compared to plants grown in 100% PB. Substrates containing 40% or more CGC had significantly higher EC levels both initially and throughout both growing seasons than did 20% CGC and 100% PB blends. Initial and final pH of all substrates was similar during both studies and remained within recommended ranges for greenhouse tomato production. Water-holding capacity increased as the percent CGC increased in each substrate blend, indicating the need for less irrigation volume for substrates containing CGC compared to the 100% PB control. Results indicate that CGC can be used as an amendment to or replacement for PB in greenhouse tomato production.


Author(s):  
Solange Gahongayire ◽  
Adamu Almustapha Aliero ◽  
Charles Drago Kato ◽  
Alice Namatovu

Bacterial infections are on a rise with causal-resistant strains increasing the economic burden to both patients and healthcare providers. Salons are recently reported as one of the sources for transmission of such resistant bacterial strains. The current study aimed at the identification of the prevalent bacteria and characterization of quaternary ammonium compound (qac) genes from disinfectant-resistant S. aureus isolated from salon tools in Ishaka town, Bushenyi District of Uganda. A total of 125 swabs were collected from different salon tools (combs, brushes, scissors, clippers, and shaving machines), and prevalent bacteria were isolated using standard microbiological methods. Identification of isolated bacteria was done using standard phenotypic methods including analytical profile index (API). Susceptibility patterns of the isolated bacteria to disinfectant were determined using the agar well diffusion method. Quaternary ammonium compound (qac) genes (qacA/B and qacC) associated with disinfectant resistances were detected from disinfectant-resistant S. aureus using multiplex polymerase chain reaction (PCR) and Sanger sequencing methods. Of the 125 swab samples collected from salons, 78 (62.4%) were contaminated with different bacteria species. Among the salon tools, clippers had the highest contamination of 20 (80.0%), while shaving machines had the lowest contamination of 11 (44.0%). The most prevalent bacteria identified were Staphylococcus epidermidis (28.1%) followed by S. aureus (26.5%). Of all the disinfectants tested, the highest resistance was shown with sodium hypochlorite 1%. Out of the eight (8) disinfectant-resistant S. aureus analysed for qac genes, 2 (25%) isolates (STP6 and STP9) were found to be qacA/B positive, while 2 (25%) isolates (STP8 and STP9) were found to be qacC gene positive. This study has shown that bacterial contamination of salon tools is common, coupled with resistance to disinfectants with sodium hypochlorite resistance being more common. Furthermore, observed resistance was attributed to the presence of qac genes among S. aureus isolates. A search for qac genes for disinfectant resistance from other bacteria species is recommended.


2002 ◽  
Vol 82 (4) ◽  
pp. 771-780 ◽  
Author(s):  
X. Hao ◽  
A. P. Papadopoulos

Two full spring season tomato crops (Lycopersicon esculentum Mill. “Trust”) were grown in an open rockwool system with standard rockwool feeding formulae (O-R; conventional method), and in closed rockwool systems with standard rockwool (C-R) or Nutrient Film Technique (C-NFT) feeding formulae (modified in 1997) in 1996 and 1997 to examine the feasibility of a fully closed rockwool production system with appropriate feeding formulae. The closed rockwool system with optimized feeding formulae achieved high marketable yield, similar to that of the open rockwool system. There were no differences in early plant growth, plant biomass or biomass partitioning, and in total fruit yield, size and grades except for the closed rockwool system with the standard rockwool feeding formulae (C-R), which had lower yield than C-NFT in the last month of harvest in 1996. The photosynthesis of old foliage was higher and the root systems at the end of the experiments were rated healthier in plants grown in the closed (C-R and C-NFT) systems than in plants grown in the open (O-R) system. Over 30% of water and fertilizer was saved with the closed systems in comparison to the conventional open system. These results demonstrated that closed rockwool systems with optimized nutrient feedings are economically and environmentally sound alternative methods for greenhouse tomato production in Ontario. Key words: Lycopersicon esculentum, tomato, yield, recycling, rockwool, greenhouse


2008 ◽  
pp. 521-528 ◽  
Author(s):  
A.P. Papadopoulos ◽  
U. Saha ◽  
X. Hao ◽  
S. Khosla

2014 ◽  
Vol 13 (4) ◽  
pp. 1-13
Author(s):  
Ram Kumar Jha ◽  
Anshul Kumar Jain

Objectives of the study are to examine the trends and percent growth rates for the area, production and productivity of different vegetable crops; ii) to estimate the trend for arrival and market prices of different vegetable crops; iii) to calculate the yearly arrival index for vegetables arrival in selected mandies, and iv) to judge integrated supply chain management of vegetables marketing in selected region. The study has been made on backward division of Uttar Pradesh named Jhansi division. Division comprises three districts: Jhansi, Lalitpur and Jalaun on the basis of secondary and primary information. The secondary information is collected for area, production, productivity, arrival and market prices of tomato, brinjal, potato, onion, okra, bottle gourd, torai and cauliflower in Jhansi, Lalitpur and Jalaun districts of Jhansi division. The primary information has been collected from Lalitpur district. There are six blocks in Lalitpur district of Uttar Pradesh (UP) viz. Bar, Birdha, Jakhoura, Madavra, Mahroni, and Talbehat. Two stage stratified random sampling method has been adopted to collect the information from vegetables growers of three blocks i.e., Mahroni, Birdha and Jakhoura. Total 114 vegetables growers categorized marginal (up to 2.5 acre land), small (> 2.5 acre land to 5 acre land) and Large (> 5 acre land) farmers, 22 middlemen (aadatiya) and 20 retailers have chosen to complete the present study. In the selected study area vegetables growers were not grading their produce. They picked vegetables from field and make bora bandi to carry in mandi. On the other hand the middlemen and retailers were grading the purchased vegetables for earning maximum profit. Preferred transportation modes were tractors, buses and taxies. But for retail selling cycle and haththela were mostly used. Vegetables growers did not store vegetables in home and warehouse. In Lalitpur district tomato production was highest in 2009-10, it was 2821 metric ton (MT). It was due to rise in area. Lalitpur and Jhansi districts have potential to increase the productivity of tomato through better governmental support. Percent Growth Rates (PGR) informed regarding percentage change in present year compare to previous year. The total arrival indicated presence of vegetables in the different vegetable mandies and arrival index presented vegetables consistent presence in the mandies i.e., higher the index higher amount of quantity arrived in the mandies. Under the marketing chain management the channel II was found most favored channel in the study area as maximum (about 90%) quantity of produce was sold through this channel by small and large farmers. Though channel I was mostly liked by marginal farmers. Middlemen purchased vegetables at 6 percent commission on per quintal basis from producers and sold to retailer by charging 3 percent mandishulk on per quintal basis. In Jakhoura block all the selected farm size categories and in Birdha block small and large farm size categories were sold their cent percent vegetables produce to middlemen. Middlemen also provide space to keep their produce and stay at night for farmers in mandi. At some occasions middlemen also provide credits to farmers for fulfilling their agricultural and family daily needs.


Author(s):  
Tahir Karaman ◽  
Faruk Oztekin ◽  
Samet Tekin

Introduction: Pathogens, such as cytomegalovirus, hepatitis B virus, hepatitis C virus, herpes simplex virus types 1 and 2, and human immunodeficiency virus are transmitted, threatening the health of dental laboratory workers, especially as a result of saliva and blood contact of patients. To prevent cross-infection, impression materials should be disinfected at the end of the impression process in the mouth. Aim: To study the effect of application time of sodium hypochlorite and quaternary ammonium-based disinfectant solution on the surface roughness of an elastomeric impression material. Materials and Methods: In this in-vitro study done during March 2020, 10 disc-shaped samples were used in each group, with a total of 110 samples obtained from a light body elastomeric impression material with dimensions of 15×3 mm. The samples were kept in a sodium hypochlorite solution (Wizard; Rehber Kimya, Istanbul, Turkey) at concentrations of 1% and 5% for 1, 5, 10, and 30 minutes and in a quaternary ammonium-based disinfectant (Zeta 7 Solution, Zhermack SpA, Italy) for 10 and 30 minutes. Surface roughness measurements were taken with a profilometer device. The data obtained were statistically analysed by Kolmogorov-Smirnov test and Wilcoxon signed rank test for dependent/paired groups for the continuous data. The significance level was set to α=0.05. Results: A statistically significant difference was found between the control group and the 1% sodium hypochlorite (30 min p-value 0.037), and 5% sodium hypochlorite (30 min p-value 0.017). The statistical evaluation of the surface roughness of the samples with different concentrations of sodium hypochlorite and the same times was done and found statistically significant at 30 mins, p-value 0.021. Conclusion: The prolonged application of the sodium hypochlorite disinfectant at 1% and 5% concentrations caused a significant increase in the light body elastomeric impression material’s surface roughness


Sign in / Sign up

Export Citation Format

Share Document