Ask a Question forum: White speckles in basil plant leaves

Views: 868, Replies: 11 » Jump to the end
Athens, Greece
avakas
Jun 27, 2017 3:24 PM CST
Hello,

I would like to ask for your help about my basil plants. First of all they all come from cuttings which then were transplanted into pots with sterilized soil mixture (compost 70%, black peat 20%, perlite 5%, earth soil 5%, organic matter). This transfer from water to soil occured 1 to 1.5 months ago and since then enviromental temperature is generally high. Right now is 37 ˚C. However, there is no direct contact with sun. Now, the problem is that I can see white speckles on their leaves without any trace of insect on their leaves. If there is anyone who can understand from photos provided and make a diagnose, could you please inform me what is the cause and possibly what could be a treatment?

Thank you in advance
Thumb of 2017-06-27/avakas/9f600e


Thumb of 2017-06-27/avakas/9e7eb1


Thumb of 2017-06-27/avakas/c9ae50

Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
Image
DaisyI
Jun 27, 2017 4:38 PM CST
Welcome!

You may be overwatering.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

Webmaster: osnnv.org
Name: Philip Becker
Fresno California (Zone 8a)
Image
Philipwonel
Jun 27, 2017 5:04 PM CST
Or ! Underwatering.
They do, prefer, cooler temps, or shade in, hot afternoon.
From my phone ? It, looks like, they could also, have leaf miners, possibly ???
😎😎😎
Anything i say, could be misrepresented, or wrong.
Name: Carol
Santa Ana, ca
Sunset zone 22, USDA zone 10 A.
Charter ATP Member Hummingbirder Lover of wildlife (Black bear badge) Orchids Region: California Plant Identifier
Image
ctcarol
Jun 27, 2017 8:44 PM CST
Certainly looks like insect damage to me.
Athens, Greece
avakas
Jun 28, 2017 11:53 AM CST
Thank you all for your quick replies. Well I believe that it is an insect damage too, but I would exclude leaf miners as their impact on leaves it looks more like white lines than white dots (as I can judge from related photos on the internet). I searched into web and I found a photo of basil with similar symptoms with mine:

Thumb of 2017-06-28/avakas/b88722

As you can see below that photo, owner attributes the cause to leafhoppers.

Today I searched again for insects above and below my basil leaves, but initially I saw nothing. However, in the end I found 3 insects which seem like tiny grasshoppers with size around 3-4 mm. I used a sticky roller to catch them and then I took photos which I uploaded here (I croped them to focus on insect that's why the bad analysis):




Thumb of 2017-06-28/avakas/341b5f


Thumb of 2017-06-28/avakas/0b7172


Thumb of 2017-06-28/avakas/44a20a


Thumb of 2017-06-28/avakas/7af4b2


I also cite an original photo to better inspect the problem's size as well as the size of insect related to that of leaf:

Thumb of 2017-06-28/avakas/f9482e


I believe it is a leafhopper or a thrip. What is your opinion and what would be a good and biological way of encountering this threat? Note that I would like to use basil leaves for making pesto for pasta.
Name: Philip Becker
Fresno California (Zone 8a)
Image
Philipwonel
Jun 28, 2017 2:44 PM CST
Yea ! Hurray! You nailed them down. Thumbs up
DE. Will, take care, of either one.
Spray, or dust.
It's natural. Thumbs up
😎😎😎
Anything i say, could be misrepresented, or wrong.
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
Image
sooby
Jun 28, 2017 3:30 PM CST
The picture's a little fuzzy but it looks like it could be the sage/mint leafhopper which is European and does feed on basil. There are some pictures to compare below. It's definitely not a thrips.

http://bugguide.net/node/view/...
Athens, Greece
avakas
Jun 28, 2017 3:35 PM CST
Hello Philip,

By DE, do you mean Diatomaceous Earth?
If so I didn't know that also comes as a spray.

Thanks
Name: Philip Becker
Fresno California (Zone 8a)
Image
Philipwonel
Jun 28, 2017 3:43 PM CST
Yes ! I do !
Mix 2oz. With a gallon. Of water. Keep shaken, while spraying. That's it. Thumbs up
NOW ! Go get them dudes. 😁😁😁
😎😎😎
Anything i say, could be misrepresented, or wrong.
Athens, Greece
avakas
Jun 28, 2017 3:47 PM CST
Thanks for your reply sooby. It is true that pictures are too fuzzy but I couldn't succeed in for a better result as my mobile camera couldn't focus better on a so tiny insect. As for the pictures you mention, I would say that insects on these are really close, if not the same, with these on my basils.
Athens, Greece
avakas
Jun 28, 2017 3:50 PM CST
I will Philip...I will! Thumbs up And I'll let you know about the results! Big Grin
[Last edited by avakas - Jun 28, 2017 3:51 PM (+)]
Give a thumbs up | Quote | Post #1487572 (11)
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
Image
DaisyI
Jun 28, 2017 6:10 PM CST
I have been doing a lot of reading and Sooby is right - Leafhoppers. The photos online couldn't make that any more apparent.

The suggested 'fix' is insecticidal soap. It is made from naturally occurring fatty acids. In California, it is being sprayed from airplanes to try and control disease carrying mosquitoes.

Apparently, the juvenile leafhoppers are more susceptible and I know from experience that Insecticidal Soap only kills what it hits. So spraying will be an every couple days thing until the leafhoppers are gone.

The good thing about Insecticidal Soap, other than low toxicity, is that, because of the way it works, the suckybugs don't build up a resistance to it. The bad thing is that there is no residual effect so you have to keep after the bugs.

But it might be better than trying to wash diatomaceous earth off your basil leaves. Smiling

http://www.clemson.edu/extensi...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

Webmaster: osnnv.org

« Garden.org Homepage
« Back to the top
« Forums List
« Ask a Question forum
Only the members of the Members group may reply to this thread.

Member Login:

Username:

Password:

[ Join now ]

Today's site banner is by Fleur569 and is called "A Transition "