hort.net Seasonal photo, (c) 2006 Christopher P. Lindsey, All Rights Reserved: do not copy
articles | gallery of plants | blog | tech blog | plant profiles | patents | mailing lists | top stories | links | shorturl service | tom clothier's archive0
Gallery of Plants
Tech Blog
Plant Profiles
Mailing Lists
    Search ALL lists
    Search help
    Subscription info
Top Stories
sHORTurl service
Tom Clothier's Archive
 Top Stories
New Trillium species discovered

Disease could hit Britain's trees hard

Ten of the best snowdrop cultivars

Plant protein database helps identify plant gene functions

Dendroclimatologists record history through trees

Potato beetle could be thwarted through gene manipulation

Hawaii expands coffee farm quarantine

Study explains flower petal loss

RSS story archive

Re: insect problem

At 6:11 PM -0600 2/6/99, David Thornton wrote:
>Dear all,
>I wonder if anyone can identify an insect problem that has wiped out my
>Colcasia esculenta and is now spreading over Xanthosoma.
>It appears on the leaf surface and underside as small black
>flecks,rounded bodies, on closer look they appear as small grains of
>sand, some sand colour others black. I can see the odd one physically
>moving about. Eventually more and more of these flecks appear and
>strands of web like thread stretch between them.
David - This sounds very much like an infestation of spider mites, of which
there are several species.  The description is quite good for this pest.
Word is that they drown in seven seconds, and they actually can be washed
off pretty easily, but with persistance, as they will return and repopulate
quickly from a few individuals or from eggs.  Not being a big advocate of
heavy duty pesticides, I generally use a combination of 70% rubbing alcohol
with a mild soap, which proves quite effective.  Test this on a small bit
of leaf first, however, because I have seen some cell damage result from
this.  This does need to be applied several times at 7 to 10 day intervals.
Good Growing.
- Jonathan

 © 1995-2017 Mallorn Computing, Inc.All Rights Reserved.
Our Privacy Statement
Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index