I wasn't able to attend due to working on the rose show, but I'll see if I can shake loose any info.

I added what I had on Friday. I can see the addition, but it was never recorded in the number of posts???? Title: "First report of rose rosette disease caused by Rose rosette virus on Knock Out roses in Louisiana." Author(s) : Singh, R.; Valverde, R.; Cook, M.; Owings, A. Author Affiliation : Department of Plant Pathology and Crop Physiology, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA. Author Email : rsingh@agcenter.lsu.edu Journal article : Plant Health Progress 2016 No.August pp.PHP-BR-16-0022 ref.1 Abstract : " To the authors' knowledge, this is the first report of rose rosette disease caused by Rose rosette virus on Knock Out roses in Louisiana. It is difficult to assess the total value of roses in Louisiana but this disease has the potential to negatively impact the thriving rose industry in the state."

It appears that mechanical infection is difficult. The cleaning your pruning shears warning appears to be just a precaution. i.e. I am not aware of anyone actually spreading the RRV by pruning shears . This 2017-03 European report states: "RRV can also be transmitted by grafting, and possibly by mechanical means (e.g. on contaminated pruning tools). " https://www.eppo.int/QUARANTINE/Alert_List/viruses/RRV000.htm ------------------------------------------------- I suggest for background that anyone interested in RRV download and read the following thesis: http://forums2.gardenweb.com/discussions/3776903/rose-rosette-virus-masters-thesis-free -------------------------------------------------- Rose Rosette Virus has now been reported in India. https://www.researchgate.net/publication/317428451_Rose_rosette_virus_An_emerging_pathogen_of_garden_roses_in_India Unfortunately, the publication did not mention the mode of transmission in India.

"Palo verde witches broom disease occurs primarily in the blue palo verde tree Parkinsonia florida (Benth. ex A. Gray) S. Wats, which is native to the southwestern (SW) states of the US and northwestern Mexico. Symptoms of witches broom disease are manifest as dense clusters of short, flexible, thornless branches with stunted leaves, and branch dieback (Figure 1). With the increased popularity of the blue palo verde as a xeriscape tree in the SW-US, the disease has spread widely in both naturally-occurring and in nursery-grown trees, at >50% incidence in nursery-grown trees, alone." See: https://apsjournals.apsnet.org/doi/abs/10.1094/PDIS-01-18-0124-PDN