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Re: yellow leaves all over my bay tree

Re: yellow leaves all over my bay tree
Posted by: peewitpete (IP Logged)
Date: April 17, 2010 06:37


BAY SUCKER
The technical term is trioza alacris, the common name is jumping plant lice (or louse)! The first signs are of leaves curling around the margins. Parts of the affected leaves then turn yellow. Finally the leaves will turn brown at the edges. The leaves finally fall off. This is often not fatal to the bay tree but it certainly weakens the tree leaving it open to other pests and diseases.

The best treatment for Bay Sucker is to keep an eye out for signs of damage so that it can be treated early on. Look out for those yellowing leaves which will also be thicker than normal where affected. When they are noticed, pick them off and burn them. Spray the under sides of all leaves with a very diluted washing up liquid solution.

If the damage is more severe you need to understand the cause. The bay sucker is a tiny insect about 2mm long which over-winters in nooks and crannies, often in the soil surrounding your bay tree. Breaking up the surface of the very top of the soil surrounding the plant to a fine tilth will help expose the pests, especially in the winter.

In mid April the first generation of Bay Suckers will appear and these will feed on the sap of your bay tree. They then lay even smaller eggs on the underside of the leaves, almost invisible to the naked eye. They can often be seen more clearly through a magnifying glass. These eggs also feed on the sap increasing the damage. They multiply quickly and often three generations worth can be seen on badly affected plants.

One pesticide works reasonably well if applied early on, it is thiacloprid. Have a look on the internet for products which contain this pesticide. be aware though, that this is a systemic pesticide and it will therefore remain present in the leaves for a couple of weeks (consult the package instructions). The leaves should not be used whilst the pesticide remains.

Subject Posted By Posted
|  yellow leaves all over my bay tree sandy 05/05/2007 08:57
||  Re: yellow leaves all over my bay tree anna 20/05/2007 12:18
|||  Re: yellow leaves all over my bay tree JohnBoy 03/09/2007 17:25
||||  Re: yellow leaves all over my bay tree lee 24/04/2010 20:33
|||  Re: yellow leaves all over my bay tree MatthewWilliam 28/10/2010 11:31
||  Re: yellow leaves all over my bay tree sarah david 24/09/2008 15:25
||  Re: yellow leaves all over my bay tree Jerry Hibbert 18/07/2009 17:02
||  Re: yellow leaves all over my bay tree peewitpete 17/04/2010 06:37
||  Re: yellow leaves all over my bay tree MatthewWilliam 23/10/2010 05:57
||  black spot on leaves arthurk 24/01/2011 16:55
|||  Re: black spot on leaves Count Doku 01/04/2013 14:46

Advice offered in this forum is of a general nature only. It is by its nature not based on any site investigation and should not be relied upon. Neither the forum administrator nor any contributor will be held liable for damages occurring as a result of relying on advice given here. You should contact a competent arboriculturist for a more detailed answer.