Study links citrus greening symptoms to phosphorus deficiency

02/27/2013 10:47:00 AM
Vicky Boyd

The bacterial disease, which is harmless to humans, is spread by the Asian citrus psyllid.

The research was published Feb. 19 in the journal Molecular Plant.

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Dr. Richard Lasker    
Seattle  |  February, 28, 2013 at 12:41 PM

Our research shows the bacteria is actively transmitted to healthy trees regardless of any nutrient level. Excessive Nitrogen made the bacteria spread faster but overall symptoms were the same. The lowered P level in infected trees is a secondary affect of the disease, like a rash in humans. I am not sure the point of the title whereas the information in the article was entirely a different story, about the markers.

Dr Lawrence J Marais    
Visalia, CA 93292  |  March, 08, 2013 at 02:44 PM

I agree with Dr Lasker. Several other deficiency symptoms related to citrus greening disease are zinc and manganese. These symptoms are secondary effects of the disease. The detection and identification of PRP (pathogenisis related proteins) such as in citrus blight affected trees, may serve as a a pre-diagnsotic tool.

Central Florida  |  March, 20, 2013 at 09:13 AM

I have been consulting with citrus growers for several years. We found that by adding Potassium silicate to our spray program with good foliar calcium, magnesium and Boron were able to help revitalize trees that were infected and helped younger trees stay clean. Insecticides were not being used due to organic crop. I am not saying we have cured any tree but we are managing the damage and protecting younger trees. This has been an on going test for over three years with promising results. This disease can make you think you have control and some other stress hit the tree and the damage can be back before you can blink. I personally think it is a result of to much fertilizer applications and soil microbial life destroyed leading to stressed trees that were left unprotected. This is now an issue of revitalizing soil and rejuvenating trees with intense management of fertilizers. Until we get trees, and soil healthy and continue to maintain health we will continue to see repeated episodes of new diseases outbreaks.

Michigan  |  January, 16, 2015 at 02:43 PM

Fungus&desease problem intensifes on my 25 trees of different varietys.Do not like chmicals if I cant help.What woud you recomend to help me.Insect is a problem as well.Ihave all type of fruits incl.graps.&nuts

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