This looks a bit like the ACP I've seen in pictures. However, it is about .75" long. The branch it is on is about 1/2" diameter.

Is it ACP? It is on the new growth from rootstock in the grove area where I have other mature trees. I think my good tasting lemon grew up from rootstock of the Washington Navel grove and I was thinking of seeing what kind of freit grew from the rootstock.

I can't find any pests on any other trees or on any of the 20 new citrus that I am about to plant.

Should I spray all of them? I've already bought Bayer Imidacloprid but haven't used it yet. I'm in Upland, CA - Inland Empire in between LA and San Bernardino.

No it isn't, we have a similar variety of that bug here. Not sure what it is, but they are quick little guys & will fly off if they get the chance.

Thank You Laaz. I was really worried.

I was just out dosing the trees with the Imidacloprid. Going to have to go back and get more. It says 21oz for a 20' diameter tree!

So if the ACP has HLB, it infects MY tree and then it eventually dies from the Imidacloprid, which stops it from killing some OTHER tree?

Should I go dose my neighbors trees? Sounds like it might be time to buy up stock in Bayer.

If the insect you seen is 3/4 inch long it certainly is not an Asian Citrus Psylid. The Asian citrus psyllid is roughly one-eighth of an inch long, about the size of an aphid. - Millet

It is a glassy-winged sharpshooter, Homalodisca vitripennis. A Florida extension agent who I spoke with last year mentioned there was some concern that they might prove to be a vector for HLB, but I think that was a rehearsal of an old fear that has proved to be unfounded. The main concern with them in relation to citrus is that they are a vector for the Xylella fastidiosa bacterium, certain strains of which cause citrus variegated chlorosis. Fortunately, this is currently, I believe, restricted to S. America, particularly Brazil. The X. fastidiosa strains here in the U.S. are basically asymptomatic in citrus, but some are a more significant issue with grapes, in which it results in Pierce's disease (although asymptomatic strains are being developed to essentially vaccinate the grapes).

The ACP is a very small moth, light colored, that will attack the new growth. When you see them they will have their rear end up in the air at about a 45 degree angle.I was with the Texas A&M people when it was found in Port Arthur Texas several years ago.

Thanks everyone for some very good information.

When I saw the shape and the behavior of the bug, I was sure it was a pest of some kind. The only info on the ACP showed pictures but I never noticed any reference to their tiny size.

It seems to me that any pest that feeds on Citrus and then moves to others is capable of spreading some disease.

I have some neighbors that are clearly ignoring their citrus trees. Does it make sense to talk to them and the ones that are taking care of their Citrus to make sure everyone is aware of the ACP danger? Would buying Imidacloprid and dosing ignored trees 80-150' from mine help mine enough to be worthwhile?

Yes, elsedgwick is correct, and this is the bane of our vineyards here in S. California, Greg. The Glassy Winged Sharpshooter will use citrus trees to live in, and continue their lifecycle. They are responsible for spreading both Oleander Leaf Scorch as well as Pierce's Disease, which is fatal to grapes. N. California has been battling this vector insect and Pierce's Disease, and it has spread to S. California, so we do want to control for this insect if possible. Most of Riverside county as well as San Bernardino county have seen the complete demise of Oleanders due to this insect and disease, and it is spreading throughout California. We see Oleander Leaf Scorch here in San Diego county as well. About 1/2 of my oleanders are infected and are slowly dying. I've pulled out about 1/3 of them so far, sadly. I am growing grapes, but expect them to eventually become infected with Pierce's Disease, which is why I'm trialing a very special table grape from Texas, 'Victoria Red', which appears to be immune (not just resistant) to Pierce's Disease. So, certainly an informed conversation would be a good thing for your neighbors. As far as ACP, yes, a regular treatment once every 6 months with Imidacloprid will help to some degree with ACP, but we do not have Citrus Greening in California yet. There was one isolated incident about a year and a half ago, but so far, we have not seen any further outbreaks. You can try to control for the psyllid, but I would watch to see if you even have any psyllids, first. I treat my trees with Imidacloprid twice a year, but I do that for Citrus Leafminer. And I know I get crossover protection from the ACP, which I have not yet seen in my yard. But, the ACP IS here in N. San Diego county, actually not all that far from me. So, for me, that makes sense. Can you get your neighbors to comply? Who knows. I back a 147 acre unmanaged abandoned Valencia orange orchard. That's a whole lot on non-compliance. Fortunately, the CDFA is monitoring the orchard which I do appreciate. So, I treat and protect what's mine. I can't make others do what they probably should do, which is really the crux of our issue here in California - the fact that it is estimated that about 70% of homeowners in S. California have at least one citrus tree in their yard. Citrus Greening no doubt will start in the residential sector. Not with commercial growers, who have been managing for ACP for about 5 or 6 years, now.

It's hard for a residential homeowner to purchase Imacloprid, and after a lot of research, we discovered that AG suppliers will sell Bayer Merit, which is mainly Imacloprid to non-licensed individuals.

I wish we could get Imacloprid, but I have no clue who would sell it to a simple homeowner, so we have doused our citrus and grapevines with the Merit brand of Imacloprid.

I didn't realize that the Oleander is also at risk. Happily, it's not my favorite plant. It's pretty, but poisonous, and we have 2 volunteers, so they will just be removed and something else put in their places.

Suzi