scholarly journals Bacterial Angular Leafspot Disease of Strawberry: Search for Resistance

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 831B-831
Author(s):  
John L. Maas ◽  
Gene J. Galletta
Keyword(s):  
North America ◽  
Chemical Control ◽  
Practical Method ◽  
Xanthomonas Fragariae ◽  
The World ◽  
Systemic Nature ◽  
Slow Growing ◽  
Resistant Genotypes ◽  
Diploid Strawberry

Bacterial angular leafspot disease (BALD) of strawberry, caused by Xanthomonas fragariae, a slow-growing and often difficult pathogen to isolate from infected plants, is most commonly manifested as small discrete, angular, translucent lesions on leaves and sepals. As the bacteria infect systemically, plants may wilt and die. BALD has become increasingly important in North America and other strawberry-growing areas of the world. The systemic nature of the pathogen also is cause for concern with international shipment of strawberry plants, especially because there is no practical method for determining the presence of the bacteria in symptomless, infected plants, nor is there a practical method of chemical control. All cultivars of Fragaria × ananassa (8×) are susceptible to BALD, although a range of susceptibility is often apparent in plantings. Resistant genotypes have been reported among clones of F. virginiana (8×), F. moschata (6×), and F. vesca (2×). A program has been initiated to evaluate native octoploid and diploid strawberry germplasm for resistance to BALD.

scholarly journals 093 Putative Sources in Strawberry for Resistance to Bacterial Angular Leafspot

HortScience ◽  
1999 ◽  
Vol 34 (3) ◽  
pp. 457D-457
Author(s):  
J.L. Maas ◽  
C. Gouin-Behe ◽  
J.S Hartung ◽  
S.C. Hokanson
Keyword(s):  
North Carolina ◽  
Chemical Control ◽  
Plant Production ◽  
Original Strain ◽  
Resistant Reaction ◽  
Xanthomonas Fragariae ◽  
The World

Bacterial angular leafspot disease (BALD) of strawberry, caused by Xanthomonas fragariae Kennedy & King, has dramatically affected commercial fruit and plant production throughout the world. Leaf lesions may kill leaves, while lesions on sepals make fruit unmarketable. The bacterium can kill stolon-tip plantlets that are being rooted for transplanting. Since plants become systemically infected, there is no adequate chemical control for BALD under conditions that favor development and spread of the disease. Strawberry is the only host and no cultivars or advanced selections have proven resistant to this disease. We screened 23 Fragaria ×ananassa, 13 F. chiloensis, 56 F. virginiana, and 2 F. vesca genotypes for resistance to two pathogenic isolates of X. fragariae (ATCC-33239, the original strain from Minnesota and Xf-3 from North Carolina). Leaves were inoculated by forcing bacterial suspensions into leaves under pressure with a syringe barrel and plunger. Plants were incubated in a moisture chamber for 3 days, followed by 1 week under mist and then placed on a greenhouse bench. Experiments were done twice for obviously susceptible reactions and three and four times for questionable and resistant reactions, respectively. Only two genotypes were found to show a resistant reaction: 80-4-38 (`Earliglow' (F. virginiana clone SG-26 from Georgia) and F. virginiana clone SG-89 (=Luby MS 7-7 from Minnesota). Each of these genotypes exhibited typical hypersensitive responses by walling-off inoculation areas. All other genotypes exhibited typical BALD symptoms 5 weeks after inoculation with both isolates.

Effects of insecticides on adults and eggs of Drosophila suzukii (Diptera, Drosophilidae)

2017 ◽  
Vol 43 (2) ◽  
pp. 208 ◽  
Author(s):  
Daniele Cristine Hoffmann Schlesener ◽  
Jutiane Wollmann ◽  
Juliano De Bastos Pazini ◽  
Anderson Dionei Grützmacher ◽  
Flávio Roberto Mello Garcia
Keyword(s):  
North America ◽  
South America ◽  
Chemical Control ◽  
Stone Fruits ◽  
Drosophila Suzukii ◽  
Ovicidal Effect ◽  
Mere Presence ◽  
South Of Brazil ◽  
Different Cultures ◽  
First Time

Drosophila suzukii (Diptera, Drosophilidae) is an exotic species, endemic to Asia and currently a pest to small and stone fruits in several countries of North America and Europe. It was detected in 2013 for the first time in South America, in the south of Brazil. Unlike most drosophilids, this species deserves special attention, because the females are capable of oviposit inside healthy fruits, rendering their sale and export prohibited. Despite the confirmed existence of this species in different states of Brazil, this insect is yet been to be given the pest status. Nevertheless, the mere presence of this species is enough to cause concern to producers of small fruits and to justify further investigation for it’s control, especially chemical control for a possible change in status. Therefore, the goal of this work was to evaluate, in laboratory, mortality of D. suzukii adults and ovicidal effect when exposed to different insecticides registered for species of the Tephritidae and Agromyzidae families in different cultures. The insecticides deltamethrin, dimethoate, spinosad, fenitrothion, phosmet, malathion, methidathion, and zeta-cypermethrin resulted in mortality to 100 % of the subjects three days after the treatment (DAT). Regarding the effects over eggs, it was  established that the insecticides fenitrothion, malathion, and methidathion deemed 100 % of the eggs not viable, followed by phosmet and diflubenzuron, which also caused elevated reduction in the eclosion of larvae two DAT.

Integrated Pest Management — How to do It?

1996 ◽  
Vol 25 (2) ◽  
pp. 107-113 ◽  
Author(s):  
Reuben Ausher
Keyword(s):  
Pest Management ◽  
Chemical Control ◽  
Ornamental Plants ◽  
Crop Protection ◽  
Environmental Concerns ◽  
Modern Agriculture ◽  
The World ◽  
Synthetic Pesticides ◽  
Control Failures ◽  
Intensive Control

Protection of crop and ornamental plants from noxious organisms — insects, nematodes, mites, pathogens and weeds — is indispensable to modern agriculture. Despite intensive control efforts, about 50% of the world's crops are lost to these organisms, at an estimated annual cost of about 400 billion dollars. Ever since the advent of synthetic pesticides in the 1940s, modern crop protection has been largely based on chemical control. Pesticide expenditures are about 20% of total farming input costs, although this figure varies substantially according to crop and region. Mounting environmental concerns and pest control failures have made It increasingly clear that the use of toxic pesticides In agriculture should be drastically reduced all over the world.

scholarly journals The Emerging Global Tobacco Treatment Workforce: Characteristics of Tobacco Treatment Specialists Trained in Council-Accredited Training Programs from 2017 to 2019

2021 ◽  
Vol 18 (5) ◽  
pp. 2416
Author(s):  
Christine E. Sheffer ◽  
Abdulmohsen Al-Zalabani ◽  
Andrée Aubrey ◽  
Rasha Bader ◽  
Claribel Beltrez ◽  
...  
Keyword(s):  
North America ◽  
Tobacco Use ◽  
Training Programs ◽  
Systems Of Care ◽  
Eastern Mediterranean ◽  
Annual Number ◽  
Treatment Services ◽  
Tobacco Treatment ◽  
The World ◽  
Academic Settings

Tobacco use is projected to kill 1 billion people in the 21st century. Tobacco Use Disorder (TUD) is one of the most common substance use disorders in the world. Evidence-based treatment of TUD is effective, but treatment accessibility remains very low. A dearth of specially trained clinicians is a significant barrier to treatment accessibility, even within systems of care that implement brief intervention models. The treatment of TUD is becoming more complex and tailoring treatment to address new and traditional tobacco products is needed. The Council for Tobacco Treatment Training Programs (Council) is the accrediting body for Tobacco Treatment Specialist (TTS) training programs. Between 2016 and 2019, n = 7761 trainees completed Council-accredited TTS training programs. Trainees were primarily from North America (92.6%) and the Eastern Mediterranean (6.1%) and were trained via in-person group workshops in medical and academic settings. From 2016 to 2019, the number of Council-accredited training programs increased from 14 to 22 and annual number of trainees increased by 28.5%. Trainees have diverse professional backgrounds and work in diverse settings but were primarily White (69.1%) and female (78.7%) located in North America. Nearly two-thirds intended to implement tobacco treatment services in their setting; two-thirds had been providing tobacco treatment for 1 year or less; and 20% were sent to training by their employers. These findings suggest that the training programs are contributing to the development of a new workforce of TTSs as well as the development of new programmatic tobacco treatment services in diverse settings. Developing strategies to support attendance from demographically and geographically diverse professionals might increase the proportion of trainees from marginalized groups and regions of the world with significant tobacco-related inequities.

Notes on Power Operated Controls for Large Aircraft

1945 ◽  
Vol 49 (410) ◽  
pp. 51-54
Author(s):  
A. Gouge
Keyword(s):  
North America ◽  
North Atlantic ◽  
The North ◽  
The World ◽  
The North Atlantic ◽  
Large Aircraft

A Study of the air routes of the world brings out almost at once the fact that some of the most difficult route are also the most attractive. For instance, the North Atlantic route which couples North America with Europe is certainly one of the most difficult in the world, but also by the fact that it couples two of the most densely populated, as well as the most wealthy groups of people in the world, one of the most attractive.

scholarly journals The duration of the active phase on surge-type glaciers: contrasts between Svalbard and other regions

1991 ◽  
Vol 37 (127) ◽  
pp. 388-400 ◽  
Author(s):  
Julian A. Dowdeswell ◽  
Gordon S. Hamilton ◽  
Jon Ove Hagen
Keyword(s):  
Time Series ◽  
North America ◽  
Active Phase ◽  
Aerial Photographs ◽  
Polar Ice ◽  
Phase Duration ◽  
Field Surveys ◽  
The World ◽  
Glacier Surges ◽  
Fast Motion

AbstractMany glaciers in Svalbard and in other glacierized areas of the world are known to surge. However, the time series of observations required to assess the duration of fast motion is very restricted. Data on active-phase duration in Svalbard come from aerial photographs, satellite imagery, field surveys and airborne reconnaissance. Evidence on surge duration is available for eight Svalbard ice masses varying from 3 to 1250 km2. Worldwide, active-phase duration is recorded for less than 50 glaciers. Few observations are available on high polar ice masses. The duration of the active phase is significantly longer for Svalbard glaciers than for surge-type glaciers in other areas from which data are available. In Svalbard, the active phase may last from 3 to 10 years. By contrast, a surge duration of 1–2 years is more typical of ice masses in northwest North America, Iceland and the Pamirs. Ice velocities during the protracted active phase on Svalbard glaciers are considerably lower than those for many surge-type glaciers in these other regions. Mass is transferred down-glacier more slowly but over a considerably longer period. Svalbard surge-type glaciers do not exhibit the very abrupt termination of the active phase, over periods of a few days, observed for several Alaskan glaciers. The duration of the active phase in Svalbard is not dependent on parameters related to glacier size. The quiescent phase is also relatively long (50–500 years) for Svalbard ice masses. Detailed field monitoring of changing basal conditions through the surge cycle is required from surge-type glaciers in Svalbard in order to explain the significantly longer length of the active phase for glaciers in the archipelago, which may also typify other high polar ice masses. The finding that surge behaviour, in the form of active-phase duration, shows systematic differences between different regions and their environments has important implications for understanding the processes responsible for glacier surges.

The Shari’a Approach to Contemporary Problems of Mass Surveillance

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Sattam Eid Almutairi
Keyword(s):  
North America ◽  
Personal Data ◽  
Legal Systems ◽  
Legal Norms ◽  
Muslim Countries ◽  
Norms And Values ◽  
The World ◽  
State Surveillance ◽  
Mass Surveillance ◽  
Do So

AbstractThe phenomenon of mass surveillance has confronted legal systems throughout the world with significant challenges to their fundamental norms and values. These dilemmas have been most extensively studied and discussed in relation to the kind of privacy cultures that exist in Europe and North America. Although mass surveillance creates the same kinds of challenges in Muslim countries, the phenomenon has rarely been discussed from the perspective of Shari’a. This article seeks to demonstrate that this neglect of mass surveillance and other similar phenomena by Shari’a scholars is unjustified. Firstly, the article will address objections that Shari’a does not contain legal norms that are relevant to the modern practice of state surveillance and that, if these exist, they are not binding on rulers and will also seek to show that, whatever terminology is employed, significant aspects of the protection of privacy and personal data that exists in other legal systems is also be found deeply-rooted in Shari’a. Secondly, it will assess the specific requirements that it makes in relation to such intrusion on private spaces and private conduct and how far it can benefit from an exception to the general prohibition on spying. Finally, it is concluded that mass surveillance is unlikely to meet these Shari’a requirements and that only targeted surveillance can generally do so.

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