Luca Zan, Bing Yu, Jianli Yu & Haiming Yan. 2018. Heritage sites in contemporary China: cultural policies and management practices. New York: Routledge; 978-1-138-05462-2 hardback £120.

Antiquity ◽  
2020 ◽  
Vol 94 (375) ◽  
pp. 816-818
Author(s):  
Hao Liu
Plant Disease ◽  
2021 ◽  
Author(s):  
Anna Wallis ◽  
Isabella Magna Yannuzzi ◽  
Mei-Wah Choi ◽  
John Spafford ◽  
Matthew Siemon ◽  
...  

Fire blight, caused by the bacterium Erwinia amylovora, is one of the most important diseases of apple. The antibiotic streptomycin is routinely used in the commercial apple industries of New York and New England to manage the disease. In 2002, and again from 2011 to 2014, outbreaks of streptomycin resistance (SmR) were reported and investigated in NY. Motivated by new grower reports of control failures, we conducted a follow-up investigation of the distribution of SmR and E. amylovora strains for major apple production regions of NY over the last six years (2015-2020). Characterization of clustered regularly interspaced short palindromic repeat (CRISPR) profiles revealed that a few ‘cosmopolitan’ strains were widely prevalent across regions, while many other ‘resident’ strains were confined to one location. In addition, we uncovered novel CRISPR profile diversity in all investigated regions. SmR E. amylovora was detected only in a small area spanning two counties from 2017 to 2020, and always associated with one CRISPR profile (41:23:38), which matched the profile of SmR E. amylovora discovered in 2002. This suggests the original SmR E. amylovora was never fully eradicated and went undetected due to several seasons of low disease pressure in this region. Investigation of several representative isolates under controlled greenhouse conditions indicated significant differences in aggressiveness on ‘Gala’ apples. Potential implications of strain differences include the propensity of strains to become distributed across wide geographic regions and associated resistance management practices. Results from this work will directly influence sustainable fire blight management recommendations for commercial apple industries in NY State and other regions.


2001 ◽  
Vol 43 (5) ◽  
pp. 175-182 ◽  
Author(s):  
D. W. Meals

Achievement of management goals for Lake Champlain (Vermont/New York, USA and Quebec, Canada) will require reduction of agricultural phosphorus loads, the dominant nonpoint source in the Basin. Cost-effective phosphorus reduction strategies need reliable treatment techniques beyond basic cropland and waste management practices. The Lake Champlain Basin Agricultural Watersheds National Monitoring Program (NMP) Project evaluates the effectiveness of livestock exclusion, streambank protection, and riparian restoration practices in reducing concentrations and loads of nutrients, sediment, and bacteria in surface waters. Treatment and control watersheds in northwestern Vermont have been monitored since 1994 according to a paired-watershed design. Monitoring consists of continuous stream discharge recording, flow-proportional sampling for total P, total Kjeldahl N, and total suspended solids, grab sampling for indicator bacterial, and land use/agricultural monitoring. Strong statistical calibration between the control and treatment watersheds has been achieved. Installation of riparian fencing, protected stream crossings, and streambank bioengineering was completed in 1997. Early post-treatment data suggest significant reduction in P concentrations and loads and in bacteria counts in the treated watershed. Monitoring is scheduled to continue through 2000.


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