Hi Greene,
I have changed my original post but would still like to follow up on the grapefruit rootstock question. Please don't make me cite sources.
(You will either become my best friend or my worst enemy
).
Grapefruit rootstock on lemons was used extensively in California in the past but, apparently the grapefruit rootstock is not resistant to any of the diseases and problems that have decimated the citrus industry in some places. Some of the rootstock must have been good because some of those orchards are still producing.
In the 1970's, when the citrus in Southern California started to decline, The University of California came up with Citrange and Poncirus trifoliata to use as rootstock. That seemed to solve their problem.
But, a couple years ago in the San Joaquin Valley (my home turf), the same problems have started to show up.
I found this article for interesting reading:
http://ucanr.edu/blogs/blogcor...
Daisy
