Hydrangea problems: the expert responds on hydrangea diseases


THE AGRONOMIST ANSWERS ON HOW TO GROW AND CARE FOR PLANTS

MY HORTENSE HAS OVAL ANIMALS, PLATES AND PROPERTIES

QUESTION OF LUCIA

Gent. Sir

I am writing to ask you for advice on how to treat hydrangea from parasites.

These are almost motionless flat oval animals of about 3mm, of an uneven brown color but also appear as white protrusions with a cottony appearance on which the brown area of ​​the parasite can be seen at the tip.

Thank you.

AGRONOME ANSWERS

Dear Lucia,

the parasites present in your hydrangea are certainly scale insects, very harmful insects. If you pass a nail you will notice that they come off easily.

I'll briefly describe who I am: what you see motionless covered by a sort of armor, is the female who remains mostly motionless and who feeds on the sap of your poor hydrangea with the special stilettos of her mouth. Inside this "armor" are also contained the eggs from which new insects will then be born. Consult thetechnical sheet of the cochineals for more information.

Considering that you don't tell me the size of the plant, the place where it is, the care you dedicate to it and the general state of health, I make some considerations (but if I'm wrong please tell me) I will consider a standard situation.

The immediate advice I give you is to equip yourself with a cotton swab that you will moisten with a little alcohol and with which you will remove these parasites one by one, making sure to pass it only where the insect is.

This is an immediate remedy to remove "the bulk" of the parasite. After doing this for about a month, with normal watering, give your hydrangea some liquid fertilizer (the one you usually use although it would be appropriate for you to tell me, reading its chemical composition on the label to check if the various mineral elements and relative percentages are indicated for your plant) to help it recover.

But always be careful, they will surely reform, so always keep it under control and eliminate them whenever they reappear. For the moment it is not advisable to carry out more drastic treatments with specific insecticides, that is to say with so-called "systemic" products that enter the plant and are poisons for the parasite that feeds on its lymph. We will do them later, once the hydrangea is well in force. In fact, hydrangea is a very delicate plant and therefore the treatments must be done wisely.

If you have any doubts or would like more clarification, write me again.

Dr. Maria Giovanna Davoli


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