Florida researchers discover possible cultivar resistance to citrus greening

 The UF researchers have identified citrus cultivars, in this case 16 citrus rootstocks, most of which show a lower rate of infection and more tolerance to citrus greening.

By Robert H. Wells, University of Florida | Sep 27, 2013(http://news.ifas.ufl.edu/.)

Results suggest classifying Carrizo, US-897, and US-942 as tolerant, US-802, US-812, and Volkamer lemon as moderately tolerant, and Cleopatra mandarin as susceptible to Las. Despite irregular growth, low rates of infection and low Las numbers indicate some resistance of Benecke to Las. Additional greenhouse experiments and field observations confirmed findings for US-802, US-897, US-942, and Cleopatra, although results for US-802 were more variable.PDF enclosed..

Florida researchers discover possible cultivar resistance to citrus greening

 The UF researchers have identified citrus cultivars, in this case 16 citrus rootstocks, most of which show a lower rate of infection and more tolerance to citrus greening.

By Robert H. Wells, University of Florida | Sep 27, 2013(http://news.ifas.ufl.edu/.)

Results suggest classifying Carrizo, US-897, and US-942 as tolerant, US-802, US-812, and Volkamer lemon as moderately tolerant, and Cleopatra mandarin as susceptible to Las. Despite irregular growth, low rates of infection and low Las numbers indicate some resistance of Benecke to Las. Additional greenhouse experiments and field observations confirmed findings for US-802, US-897, US-942, and Cleopatra, although results for US-802 were more variable.PDF enclosed..

Apparently no rootstocks show resistance to citrus greening disease. However, recently research have been undergoing in this aspects and it was observed that some of the wild species of citrus are not showing any symptoms inspite of citruss trees around are infected.

Many of the frontline researchers have now started shifting their attention towards developing agrotechniques under the inoculum of greening instead of eradicating greening and then developing technologies..

It an urgent need to have action oriented and technology driven collaborative programme at national to address the problems of citrus industry

Thanks to all of u for this valuable information about Citrus greening but we should try to find a solution bcz nothing is impossible. Thats why we should work on this

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Hi Ashok

I attached some useful references for you

https://ruckscitrusnursery.com/greening-tolerant-rootstocks/

2

http://citrusagents.ifas.ufl.edu/events/GrowersInstitute2016/pdf/HLB%20Tolerence%20and%20Resistance%20Florida%20Citrus%20Growers%27%204.16.pdf

3

https://www.imok.ufl.edu/hlb/database/pdf/00001140.pdf

4

https://phys.org/news/2016-03-citrus-scionrootstock-combinations-tolerance-huanglongbing.html

5

http://www.growingproduce.com/citrus/raising-citrus-disease-resistant-rootstocks/

6

http://apsjournals.apsnet.org/doi/full/10.1094/PDIS-03-16-0271-RE

7

https://www.theledger.com/article/20141008/News/608095643

8

http://www.ishs.org/ishs-article/1127_15

9

https://hortsci.ashspublications.org/content/46/1/16.full

10

https://www.sciencedaily.com/releases/2016/03/160328133737.htm

11

http://www.southeastfarmpress.com/orchard-crops/florida-researchers-discover-possible-cultivar-resistance-citrus-greening

12

https://en.wikipedia.org/wiki/Citrus_greening_disease

13

https://www.sciencedaily.com/releases/2015/11/151123202216.htm

14

https://www.gainesville.com/article/20150819/SPORTS/604159706

15

https://extension.arizona.edu/sites/extension.arizona.edu/files/resources/citrus-greening-florida-texas.pdf

16

https://citrusindustry.net/2017/04/19/lindcove-searching-citrus-varieties-resistant-hlb/

17

http://www.actahort.org/members/showpdf?booknrarnr=1127_15

18

http://news.nationalgeographic.com/news/2014/09/140914-florida-orange-citrus-greening-gmo-environment-science/

19

https://www.nap.edu/read/12880/chapter/5

20

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4923198/

This link may help you.    

http://ruckscitrusnursery.com/greening-tolerant-rootstocks/

Thanks Dr. Anoop, Dr.  Laith Al-Ani and Dr. Milan you gave me really good information related to citrus greening. 

Dear Ashok Kumar

In a research, wenty-three rough lemon strains (Citrus jambhiri Lush.) and 10 other rootstocks were bud-inoculated with greening-pathogen to test their degree of resistance. Five rough lemon strains, namely ‘Milam’, ‘Miri’, ‘South Africa-I’, ‘South Africa-II’ and ‘Volkamar’, were found to be tolerant.

Also in another study, disease resistance/tolerance was observed in Australian citrus relative genera Eremocitrus and Microcitrus, which are sexually compatible with citrus and may be useful in future breeding trials to impart HLB resistance to cultivated citrus.

Field experiment with genebank at Riverside CA of 85 citrus relative genotypes showed Poncirus among most-resistant to greening.

Article Evaluation of rough lemon strains and other rootstocks again...

Thanks Mr. S. M. Miri, I evaluate your answer, nd found that rough lemon strains u mentioned they carry some tolerance to greening or hlb disease of citrus..