A few
days ago I noticed the orange tree was, well,...not orange,...not green,...but black. Yikes! A dark, dull, ashy, gritty, sticky, black substance thickly covered all the leaves on our mid-sized, (5 years old?) orange tree. I had to do something. This does not look good for happy chlorophyll pumping activity.
So I did some research, and found through the Ag Extension and various sites, a bit about the problem. It's Sooty Mold combined with insect honeydew, (which is aphid or whitefly secretions). Turns out I was kind of right about the food production "blocking effects" of this stuff. Invading insects secrete a clear, sticky stuff, (honeydew) on leaves, and then wind-borne, Sooty Mold spores stick to the honeydew and create the thick, black coating which does block plant photosynthesis.
Yowsa!
My readings suggested washing the leaves with Murphy's Oil soap, so I went for it. It took over an hour and I was covered with sticky flaky bug shit by the end, but I got great aesthetic results. See my before and after pics!
Before
After!
After the long, meticulous and loving cleaning, I also gave the whole tree a nice soapy spritz and then moved on to all the other citrus trees in the yard. They are unaffected with the mold so far. Let's keep it that way. So I spritzed them all with Murphy's too. The soapy spritz is also supposed to help keep the critters away. I looked and didn't see a lot of bugs, but I do think I saw some tiny whitefly larve on the underside of one leaf. Bye bye suckers (literally).
I'll keep trying the soapy spritz, (just found a suggestion to try baking soda and vegetable oil with the Murphy's -might try that) on all the tress. I'm avoiding pesticides at all costs and I'll keep you posted on the results. And if I get a bumper crop of citrus next winter and you come down for a sunny visit, I'll squeeze you a glass.
In any case, my orange tree looks much better and looks to me like it feels much better too.
...and now, after the grossness of that job, I better go look and feel much better too.
Splasssshhhhhh.................Ahhhhhhh