Eucalyptus problems: the expert answers on the diseases of the Eucalyptus


THE AGRONOMIST ANSWERS ON HOW TO GROW AND CARE FOR PLANTS

I HAVE THREE SICK EUCALYPTUS PLANTS, CAN YOU HELP ME?

QUESTION OF GIULIANO

Good morning,

I'm looking for help. I have three diseased eucalyptus plants. Nobody, showing the leaves in Brescia, can help me. I am attaching the image of a leaf.

Almost the entire lower part of the plant is infested. The leaves are covered with small reliefs, then dry up and fall off. Hoping you can help me, I wish you good work.

Julian

AGRONOM ANSWERS

Hi Giuliano,

as soon as I saw the photo I realized that it was a powerful attack of insects as those highlighted protuberances were galls, i.e. growths that are created by different species of insects that inject more or less harmful substances into the tissues of the plant which stimulate the cells of the plant to grow abnormally. Generally these galls are created by females to lay eggs inside which the larvae of their young develop. The hole you see is the exit hole for the larvae when they mature.

Having made this small premise, I tell you that I have never personally seen galls of that type but I had heard of them so consulting some specialized magazines I unfortunately believe I have had confirmation of my initial intuition. In fact, since 1998 this small insect has arrived in Italy, accidentally imported from Australia Ophelimus maskelli of the family ofEulophidae.

I have read that some researchers from the University of Palermo and Naples are carrying out attempts at experimental struggle using parasitoids developed by Israeli researchers (other animals that parasitize this insect and cause it to die) on some regions of the Italian territory.

I do not know if these experiments are in progress in your region (I give it to you for sure in Calabria, Sicily and Sardinia) in any case, I invite you to contact the Faculty of Agriculture as soon as possible and in particular the Institute of Agricultural Entomology to you more near where to take a sample in order to give you confirmation of the pathogen and also advise you on what to do.

See you soon.

Dr. M. G. Davoli



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