The third sentence in the introduction to this paper is obviously wrong. It reads: “The vast majority of gram-negative bacterial plant pathogens appear to be dependent primarily on one insect vector, are vertically transmitted from parent to offspring, and are confined only to plant tissue in which their insect host feeds [1,3–8].”

Why is it wrong? Two main reasons:

(1) Most bacterial plant pathogens are gram-negative. So, this third sentence contradicts the first sentence in the same introduction, reading: “Most bacterial plant pathogens are not vectored by insects [1,2].”

(2) Not even The vast majority of INSECT TRANSMITED gram-negative bacterial plant pathogens appear to be dependent primarily on one insect vector, are vertically transmitted from parent to offspring, or are confined only to plant tissue in which their insect host feeds.
Many xylem-inhabiting gram-negative bacteria (as, for example, Pantoea stewartii, Erwinia amylovora, Erwinia tracheiphyla or Xylella fastidiosa) are transmitted by insects, but not always are they “transmitted from parent to offspring”, nor “confined only to plant tissue in which their insect host feeds”.

Perhaps what the authors wanted to say was something like:
“The vast majority of PHLOEM RESTRICTED bacterial plant pathogens appear to be dependent primarily on one insect vector, are vertically transmitted from parent to offspring, and are confined only to plant tissue in which their insect host feeds.”